Nailing machine and driver for nailing machine

Abstract

To provide a nailing machine and a driver for the nailing machine that can reduce the device weight and alleviate burden on a user caused by reaction when driving in a nail.SOLUTION: A nail driving machine 1 comprises: a cylinder 4; a piston 5; a pressure accumulation chamber 7 formed inside the cylinder 4; and a driver 8 coupled to the piston 5. The driver 8 comprises: a tip 21 being the portion striking a nail 101; a base end part 22 fixed to the piston 5; and an intermediate part 23 between the tip 21 and the base end part 22. The tip 21 and the base end part 22 are solidly formed, whereas the intermediate part 23 is provided with a hollow part 23B.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a nail driver used for driving nails in construction work and the like, and a driver for a nail driver.

Background Art

[0002] At construction sites, various nail drivers have been conventionally used to drive nails into building members such as wood. Such a nail driver generally includes a hammer member (driver) for striking the nail to be driven into an object, and a driving means for driving this driver.

[0003] As such a nail driver, for example, as disclosed in Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2001-25980), a nail driver that connects a nail driver main body to a compressor with an air hose and drives a driver with air pressure from the compressor has been widely used conventionally.

[0004] On the other hand, in recent years, a nail driver has been proposed in which an electric drive mechanism (electric motor and battery) is built into the nail driver, and the driver is driven by this drive mechanism, eliminating the need for handling an annoying air hose and improving usability. For example, Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2007-216339) discloses an electric nail driver that drives nails using a driving means using a flywheel. Further, Patent Documents 3 (Japanese Unexamined Patent Application Publication No. 2021-160028) and 4 (Japanese Unexamined Patent Application Publication No. 2021-171899) disclose a nail driver that drives nails using a driving means using a gas cylinder and includes an electric driver return mechanism using a rack and a pinion.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] By the way, the electric nail drivers disclosed in Patent Documents 2 to 4 described above have a problem that the weight of the device increases due to the built-in electric motor and battery. This is a burden on the user who holds the nail driver by hand to perform work. In addition, since the nail driver drives a nail by the impact of a driver, the reaction and vibration at the time of driving act on the user, which is also a great burden on the user.

[0007] The present invention has been made paying attention to the above problems, and an object thereof is to provide a nail driver and a driver for a nail driver that can reduce the weight of the device and reduce the burden on the user due to the reaction at the time of driving a nail. [Means for Solving the Problems]

[0008] In a nail driver including a driver which is a shaft-like member that applies an impact to a nail to be driven into an object, and a driving means that drives the driver toward the nail, the driver includes a tip portion that collides with the nail, a base end portion on the side opposite to the tip portion, and an intermediate portion disposed between the tip portion and the base end portion, and while the tip portion and the base end portion are solid, the intermediate portion is provided with a hollow portion.

[0009] It is desirable that the driving force by which the driving means drives the driver toward the nail is adjusted so that the momentum imparted to the nail when the driver collides with the nail gives the impact force required for driving the nail.

[0010] The driving means may include a piston to which the base end portion of the driver is fixed, a cylinder in which the piston is slidably accommodated, a pressure accumulation chamber provided on the side opposite to the driver within the piston and filled with compressed gas, and a return mechanism that, when the nail is not being driven, pulls back the cylinder and the driver toward the pressure accumulation chamber side to hold the cylinder and the driver in a standby position, and when driving the nail, releases the holding of the cylinder and the driver in the standby position and applies the pressure from the pressure accumulation chamber to the cylinder and the driver.

[0011] The driving means may include an electric motor and a battery that supplies power to the electric motor.

[0012] Further, the present invention relates to a driver for a nail driving machine, which is a shaft-like member that strikes a nail to be driven into an object, and includes a tip portion that collides with the nail, a base end portion on the side opposite to the tip portion, and an intermediate portion between the tip portion and the base end portion. While the tip portion and the base end portion are solid, a hollow portion is provided in the intermediate portion.

[0013] A through hole that penetrates the intermediate portion in the longitudinal direction is provided in the hollow portion. Hole The through hole Hole may have its interior as the hollow portion.

[0014] The hollow portion may be filled with a member that is lighter than the member constituting the intermediate portion.

[0015] A reinforcing structure for improving the mechanical strength of the intermediate portion may be provided within the hollow portion.

[0016] As the reinforcing structure, a reinforcing tubular member may be disposed within the hollow portion.

[0017] As the reinforcing structure, a plurality of protrusions may be formed on the surface of the intermediate portion on the hollow portion side.

[0018] As the reinforcing structure, a honeycomb structure may be disposed inside the hollow portion.

[0019] The tip portion may be formed of a member having higher rigidity and wear resistance than the member constituting the intermediate portion.

[0020] The tip portion, the base end portion, and the intermediate portion may be formed as separate members and joined to each other by welding or brazing.

[0021] The intermediate portion may be formed of high-tensile steel.

[0022] A surface treatment for enhancing sliding wear resistance may be applied to the outer peripheral surface of the intermediate portion.

Advantages of the Invention

[0023] According to the nail driver of the present invention (for example, nail driver 1), the driver (for example, driver 8), which is a member for striking a nail (for example, nail 101), is provided with a solid tip portion (for example, tip portion 22 ) and a base end portion (for example, base end portion 21 ) and an intermediate portion (for example, intermediate portion 23) having a hollow portion (for example, hollow portion 23B). Therefore, the weight of the driver is reduced by the amount of the hollow portion. Thus, the weight of the nail driver can be reduced, and the burden on the user can be reduced. Further, since the driver, which is a striking member, becomes lightweight, the recoil on the user during nail driving also becomes smaller, and the burden on the user can be reduced in this respect as well. On the other hand, since the moving speed of the driver can be increased by the amount of weight reduction, the momentum (impulse) imparted to the nail from the configuration including the driver (for example, driver assembly 9) during nail driving can ensure the magnitude required for nail driving. Therefore, Nail while appropriately ensuring the striking force required for driving the nail, it is possible to configure a nail driver that is lightweight and has a small burden on the user, which has a very practically preferable and great effect.

[0024] In addition, if the driving force of the driving means (for example, the pressure of the gas in the accumulator chamber 7) is adjusted, the speed of the driver can be appropriately adjusted, and the striking force by the driver can be easily optimized.

[0025] In addition, if a piston (for example, piston 5) to which the proximal end portion of the driver is fixed, a cylinder (for example, cylinder 4) in which the piston is slidably accommodated, an accumulator chamber (for example, accumulator chamber 7) formed in the cylinder, and a return mechanism for returning the piston and the driver to the standby position are provided, even when it is necessary to adjust the speed of the driver when driving a nail, it can be easily dealt with by adjusting the gas pressure in the accumulator chamber.

[0026] In addition, if the driving means (return mechanism) includes an electric motor and a battery, an easy-to-use electric nail driver can be configured. On the other hand, although a heavy electric motor and a battery are provided, the driver is lightweight, so that the weight of the device does not become too large.

[0027] In addition, according to the driver for a nail driver of the present invention (for example, driver 8), since it includes a solid tip portion (for example, tip portion 22 ) and a proximal end portion (for example, proximal end portion 21 ) and an intermediate portion (for example, intermediate portion 23) having a hollow portion (for example, hollow portion 23B), the driver is lightened by the amount of the hollow portion, the weight of the nail driver can be reduced, and the burden on the user can be reduced. Also, the recoil on the user when driving a nail is reduced, and the burden on the user can be reduced in this respect as well. On the other hand, since the driver can have a higher moving speed by the amount of weight reduction, the momentum (impulse) imparted to the nail from the configuration including the driver (for example, driver assembly 9) when driving the nail can ensure the magnitude necessary for driving the nail. Therefore, Nail while appropriately ensuring the striking force required for driving

[0028] In addition, in the hollow portion, a through hole Hole (for example, through hole HoleProvided with a 23A) and penetrating Hole If the inside of is made into a hollow part, the hollow part can extend over the entire longitudinal direction of the intermediate part. Therefore, the hollow part can be made as large as possible, and the weight of the driver can be greatly reduced. In addition, since the openings formed in the intermediate part are only at both longitudinal ends (no openings are formed on the sides), the mechanical strength of the intermediate part will not be excessively reduced, and a driver having sufficient mechanical strength as a striking member can be configured.

[0029] Also, if the hollow part is filled with a member lighter than the member constituting the intermediate part, while reducing the weight of the driver, sufficient mechanical strength can be ensured for the intermediate part.

[0030] Also, if a reinforcing structure for improving the mechanical strength of the intermediate part is provided in the hollow part, while suppressing an increase in the weight of the driver, the mechanical strength of the intermediate part can be increased.

[0031] Also, as a reinforcing structure, if a reinforcing tubular member (for example, the reinforcing tubular member 31) is arranged in the hollow part, since the reinforcing tubular member firmly supports the intermediate part from the inside, the mechanical strength of the intermediate part can be increased.

[0032] Also, as a reinforcing structure, if a plurality of protrusions (for example, ribs 32) are formed on the surface of the intermediate part on the hollow part side, the mechanical strength of the intermediate part can be increased without adding a new reinforcing member.

[0033] Also, as a reinforcing structure, if a honeycomb structure (for example, the honeycomb structure 33) is arranged in the hollow part, by using a honeycomb structure formed from a lightweight sheet member (for example, the cylindrical sheet member 33A, the corrugated sheet member 33B), while minimizing an increase in weight, the mechanical strength of the intermediate part can be increased.

[0034] Also, if the tip part is formed of a member having higher rigidity and wear resistance than the intermediate part, while reducing the weight of the driver, an appropriate strike can be performed, and a highly durable driver can be configured.

[0035] If the tip portion, the base portion, and the intermediate portion are made of separate members and joined to each other by welding or brazing, the manufacturing of each member (especially the formation of the hollow portion in the intermediate portion) can be easily performed, and the driver formed by combining each member can have sufficient mechanical strength.

[0036] Also, if the intermediate portion is formed of high-tensile steel, the formation of the hollow portion in the intermediate portion can be performed without problems while ensuring sufficient mechanical strength for the intermediate portion.

[0037] Further, if the outer peripheral surface of the intermediate portion is subjected to a surface treatment to enhance sliding wear resistance, sufficient sliding wear resistance can be ensured for the intermediate portion even if the intermediate portion is formed of high-tensile steel.

Brief Description of the Drawings

[0038]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0039] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Figures 1 and 2 show the overall configuration of a nail driver according to an embodiment of the present invention. As shown, the nail driver 1 is a device for driving a nail 101 into an object 102 (e.g., a building material such as wood), and includes a main body case 2 and a handle 3 integrally provided on the main body case 2.

[0040] A cylinder 4 is built into the main body case 2, and a piston 5 is slidably disposed within the cylinder 4. A ring groove 5A is formed on the outer periphery of the piston 5, and a seal ring 6 is provided in the ring groove 5A. Thereby, an airtight accumulator chamber 7 is formed above the piston 5 within the cylinder 4. The accumulator chamber 7 is filled with a gas (e.g., compressed air) compressed to a predetermined pressure, and the piston 5 is driven by the pressure of this compressed gas (the spring force of the gas cylinder).

[0041] A driver 8, which is an axial hammer member (striking member) that strikes the nail 101 to be driven into the object 102, is fixed to the piston 5 and extends toward the opening 4A side (opposite side to the accumulator chamber 7) of the cylinder 4. The piston 5 and the driver 8 constitute a driver assembly 9. Details of the driver assembly 9 will be described later with reference to FIG. 3.

[0042] A guide member 10 is fixed to the opening 4A of the cylinder 4. The guide member 10 is provided with a guide nose 10A extending from the main body case 2. A guide passage 10B penetrating in the longitudinal direction is formed in the guide nose 10A, and the driver 8 can move within this guide passage 10B.

[0043] The nail driver 1 includes a nail magazine 11 for supplying the nail 101. The nail magazine is disposed adjacent to the guide nose 10A, and the nail 101 to be driven in the next strike is supplied from the nail magazine 11 to a predetermined position in the guide passage 10B of the guide nose 10A.

[0044] On the side of the cylinder 4 of the case internal member 10, a damper 12 is provided. The damper 12 is disposed within the opening 4A of the cylinder 4 and is a member that absorbs an impact by colliding with the piston 5 that has been driven toward the opening 4A side of the cylinder 4 when driving the nail 101, and also functions as a stopper that prohibits further movement of the piston 5.

[0045] The nail driver 1 is provided with a drive unit 13. A drive mechanism (not shown) including an electric motor is built into the drive unit 13. The drive mechanism is configured as a return mechanism that pulls back and holds the driver assembly 9 to a standby position (the position shown in FIG. 1) where it has been retracted into the cylinder 4, and is driven by an electric motor. Note that the holding of the driver assembly 9 by the return mechanism is released by operating a trigger switch 3A provided on the handle 3.

[0046] As a specific configuration of the return mechanism, for example, any well-known mechanism such as a mechanism using a rack and pinion disclosed in Patent Document 3 (Japanese Unexamined Patent Application Publication No. 2021-160028) or Patent Document 4 (Japanese Unexamined Patent Application Publication No. 2021-171899) may be used. Further, the battery that supplies power to the electric motor may be disposed, for example, inside the drive unit 13 or the handle 3.

[0047] With such a configuration, when driving the nail 101 into the object 102, as shown in FIG. 1, the nail driver 1 with the driver assembly 9 held in the standby position is set so that the tip 10C of the guide nose 10A is disposed at the driving position of the object 102. In this state, by operating the trigger switch 3A to release the holding of the driver assembly 9, as shown in FIG. 2, the pressure accumulation chamber 7 of the cylinder 4 rapidly expands due to the gas pressure of the compressed gas, and the driver assembly 9 is pushed out toward the nail 101 within the guide passage 10B. As a result, the head of the nail 101 is struck by the tip 22 of the driver 8, and the nail 101 is driven out from the tip 10C of the guide nose 10A and driven into the object 102.

[0048] Figure 3 shows the details of the driver assembly 9. As shown, the driver assembly 9 is composed of a piston 5 having a substantially cylindrical shape and a driver 8 which is a shaft-like member. The driver 8 is composed of three parts: a base end portion 21 disposed on the piston 5 side, a tip end portion 22 disposed on the side opposite to the base end portion 21, and an intermediate portion 23 disposed between the base end portion 21 and the tip end portion 22. The base end portion 21, the intermediate portion 23, and the tip end portion 22 are manufactured as independent separate members and are joined to each other by, for example, welding or brazing.

[0049] The base end portion 21 is provided with a fitting portion 21A that extends to the side opposite to the intermediate portion 23, and is fixed to the piston 5 in a state where the fitting portion 21A is fitted into a fitting hole 5B formed in the piston 5. The base end portion 21 is formed of a metal material such as aluminum, for example, and is configured as a solid member having no cavity inside. That is, the base end portion 21 is a connecting portion between the driver 8 and the piston 5, and is a portion where a large bending moment can act during the operation of the nail driver 1. Therefore, it is configured as a solid member, and by ensuring mechanical strength, breakage of the driver 8 (for example, breaking at the base end portion 21) is appropriately prevented.

[0050] The tip end portion 22 is a portion that collides with the head of the nail 101 and strikes the nail 101 when driving the nail 101, and is formed of a metal material having high rigidity and wear resistance such as super steel (cemented carbide), for example, and is configured as a solid member having no cavity inside.

[0051] In addition, since the tip end portion 22 is a portion that strikes the nail 101, particularly high rigidity and wear resistance are required as compared with other portions of the driver 8. However, other portions (the intermediate portion 23 and the base end portion 21) of the driver 8 do not require the same level of rigidity and wear resistance as the tip end portion 22. Therefore, the tip end portion 22 is a portion that is very short in length (for example, a portion having a length of about 1 / 15) compared to the remaining portions of the driver 8.

[0052] The intermediate portion 23 is a long axial portion that occupies most of the length of the driver 8. In the intermediate portion 23, a through-hole Hole 23A is provided, and inside this through-hole Hole 23A, a hollow portion 23B extending over the entire longitudinal direction of the intermediate portion 23 is formed. As a result, the driver 8 becomes lighter by the amount of the hollow portion 23B in the intermediate portion 23 compared to the case where the whole is formed solid. Also, the Hole formed in the intermediate portion 23 is a through-hole Hole 23A (with openings only at both longitudinal ends Hole ), so the mechanical strength of the intermediate portion 23 does not decrease more than necessary, and sufficient mechanical strength as a hammer member (striking member) is ensured for the driver 8.

[0053] The intermediate portion 23 of the driver 8 is formed of a metal such as, for example, high-tensile steel, skin-burned steel, spring steel, SK material, etc. Conventionally, as the material constituting the driver, die steel has been mainly used in consideration of impact resistance, compressive strength, toughness, sliding wear resistance, etc. However, when the intermediate portion 23 of the driver 8 has a hollow structure as in the present invention (that is, when a through-hole Hole 23A (hollow portion 23B) is formed in the intermediate portion 23), it is difficult to form the intermediate portion 23 of die steel (since the mold itself for forming the driver is made of die steel, when trying to create a hollow structure, the mold cannot withstand the strength). For this reason, in the present invention, as the material constituting the intermediate portion 23 of the driver 8, the above-mentioned metals are used. In particular, by forming the intermediate portion 23 of high-tensile steel, a hollow structure can be formed in the intermediate portion 23 without problems, and sufficient mechanical strength (impact resistance, compressive strength, toughness, etc.) can also be ensured.

[0054] When the intermediate portion 23 of the driver 8 is formed of the above material such as high-tensile steel, in order to enhance the sliding wear resistance of the surface of the intermediate portion 23, surface treatment may be performed on the outer peripheral surface of the intermediate portion 23. Thereby, the outer peripheral surface of the intermediate portion 23 made of high-tensile steel or the like can be given sliding wear resistance comparable to that of die steel.

[0055] Thus, although the driver 8 (driver assembly 9) of this embodiment is lightweight, sufficient striking force can be ensured for driving the nail 101. That is, since the moving speed of the driver assembly 9 increases by the amount of weight reduction, the momentum (impulse) imparted from the driver assembly 9 to the nail 101 can ensure the magnitude necessary for driving the nail 101. Therefore, according to the nail driver 1 and the driver 8 of this embodiment, the nail driver 1 can be made lightweight without causing any hindrance to driving the nail 101.

[0056] In particular, when the driver assembly 9 is biased by the gas pressure (gas spring) in the accumulator chamber 7 as in the nail driver 1 of this embodiment, since there is no gas leakage from the accumulator chamber 7, the energy loss is small compared to cases such as when compressed air from an external compressor is used as the driving force. Therefore, it is considered that sufficient speed can be ensured for the driver assembly 9 without significantly changing the setting of the pressure of the compressed gas in the accumulator chamber 7 from the setting in the case of a driver assembly without the hollow portion 23B.

[0057] In the case where sufficient speed cannot be obtained for the driver assembly 9, the speed of the driver assembly 9 may be increased by adjusting the driving force of the driving means. On the other hand, when it is appropriate to lower the speed of the driver assembly 9, conversely, the pressure of the compressed gas in the accumulator chamber 7 may be decreased. In the nail driver 1 of this embodiment, the speed of the driver assembly 9 can be easily adjusted by changing the pressure of the compressed gas in the accumulator chamber 7 and adjusting the spring force of the gas spring.

[0058] Thus, according to the nail driver 1 of the present embodiment, since the driver 8 having the hollow portion 23B in the intermediate portion 23 is provided, it is possible to reduce the weight of the nail driver 1 while ensuring the striking force required for driving the nail 101. Therefore, the burden on the user caused by the weight of the nail driver 1 can be reduced. This is particularly effective in the nail driver 1 incorporating an electric motor and a battery, which becomes heavier as a result.

[0059] In addition, when using the nail driver 1, since the weight of the driver assembly 9, which is the part that operates for driving the nail 101, is reduced, the recoil acting on the user can be reduced, and the burden on the user can also be reduced in this regard.

[0060] Further, since the driver 8 is configured by combining three independent separate members, namely, the base end portion 21, the tip end portion 22, and the intermediate portion 23, the manufacturing of each member (for example, the processing of the through hole 23A in the intermediate portion 23) can be easily performed. Also, since the base end portion 21, the tip end portion 22, and the intermediate portion 23 are joined with sufficient joining strength by welding or brazing to each other, the driver 8 has sufficient mechanical strength as a whole and functions appropriately as a striking member (hammer member). Hole In the present embodiment, the hollow portion 23B is left as a cavity. However, if necessary, a configuration in which the hollow portion 23B is filled with a material (for example, resin) lighter than the material constituting the intermediate portion 23 can also be adopted. Thereby, while reducing the weight of the intermediate portion 23 compared to the case where the entire intermediate portion is a solid member made of the same material, the mechanical strength can be increased compared to the case where it remains a cavity.

[0061] In addition, as shown in FIGS. 4 to 6, it is also possible to provide a reinforcing structure in the hollow portion 23B for improving the mechanical strength (such as impact resistance, compressive strength, toughness, etc., the strength for not being crushed or bent) of the intermediate portion 23. By providing such a reinforcing structure, while reducing the weight of the intermediate portion 23 compared to the solid case where the hollow portion 23B does not exist, the mechanical strength of the intermediate portion 23 can be sufficiently increased.

[0062] ​

[0063] FIG. 4 shows an embodiment having a double tube structure including a reinforcing tubular member 31 disposed in the hollow portion 23B as such a reinforcing structure. As shown in the figure, the reinforcing tubular member 31 is formed with a plurality (five in this embodiment) of concave portions 31A obtained by crushing a cylindrical tube toward the central axis side, and between these Concave portions 31A, a plurality (five in this embodiment) of convex portions 31B having substantially the same shape (a shape in which the wall thicknesses of the tubes are overlapped) are formed. With such a configuration, the reinforcing tubular member 31 abuts on the inner peripheral surface of the through Hole 23A and supports the intermediate portion 23 from the inside. Thereby, the mechanical strength of the intermediate portion 23 is reinforced.

[0064] Note that the plurality of convex portions 31B are formed at equal intervals (symmetrically and evenly) in the circumferential direction of the tube. Thereby, the intermediate portion 23 is firmly supported as a whole without bias in the circumferential direction by the reinforcing tubular member 31.

[0065] FIG. 5 shows an embodiment in which the intermediate portion 23 is formed as a deformed tube by forming a plurality of protrusions (ribs 32 in this embodiment) extending in the axial direction (longitudinal direction) of the intermediate portion 23 on the inner peripheral surface of the through Hole 23A as a reinforcing structure. The rib 32 has, for example, a mountain shape with a substantially triangular cross section and is evenly disposed over the entire circumferential direction of the through Hole 23A. The rigidity of the intermediate portion 23 is increased by these numerous ribs 32. In this way, by adopting a rib structure (numerous ribs 32) as the reinforcing structure, the mechanical strength of the intermediate portion 23 can be reinforced without adding a new reinforcing member.

[0066] FIG. 6 shows an embodiment having a honeycomb structure 33 disposed in the hollow portion 23B as a reinforcing structure. The honeycomb structure 33 is composed of a plurality of cylindrical sheet members 33A concentric with the intermediate portion 23 and corrugated sheet members 33B disposed between the cylindrical sheet members 33A. The plurality of cylindrical sheet members 33A have different inner diameters and are arranged in a concentric nested state. The corrugated sheet member 33B is arranged in a state where the upper and lower ends of the wave are in contact with adjacent cylindrical sheet members 33A, respectively.

[0067] Thus, by adopting the honeycomb structure 33 as the reinforcing structure, the entire circumferential direction of the intermediate portion 23 can be firmly reinforced in a well-balanced manner. Further, since the cylindrical sheet members 33A and the corrugated sheet members 33B constituting the honeycomb structure 33 can be made lightweight, the weight increase of the driver 8 due to the provision of the honeycomb structure 33 can be minimized.

[0068] As described above, although the embodiments of the present invention have been described, the present invention is not limited to the contents of the above embodiments. For example, in the above embodiments, the gas cylinder type nail driver 1 has been described as an example, but the application range of the present invention is not limited to such a form. The present invention is also applicable to a nail driver of a type that drives a driver with pneumatic pressure from a compressor independent of the nail driver body, and a nail driver of a type that performs all driving of the driver, including driving in the nail direction, with an electric motor.

Industrial Applicability

[0069] The present invention can be used for a nail driver used in construction work and the like.

Explanation of Reference Numerals

[0070] 1 Nail driver 2 Main body case 3 Handle 3A Trigger switch 4 Cylinder 5 Piston 5A Ring groove 5B Fitting hole 6 Seal Ring 7 Accumulator Chamber 8 Driver 9 Driver Assembly 10 Guide Member 10A Guide Nose 10B Guide Passage 10 C Tip of the Guide Nose 11 Nail Magazine 12 Damper 13 Drive Unit 21 Base End of the Driver 21A Fitting Portion 22 Tip End of the Driver 23 Middle Portion of the Driver 23A Penetration Hole 23B Hollow Portion 31 Reinforcing Tubular Member 31A Recessed Portion 31B Protruding Portion 32 Rib 33 Honeycomb Structure 33A Cylindrical Sheet Member 33B Wavy Sheet Member 101 Nail 102 Object

Claims

1. A driver which is a shaft member that applies a strike to a nail driven into an object, driving means for driving the driver toward the nail In a nail driver provided with, The driver includes a tip portion that collides with the nail, a base end portion on the side opposite to the tip portion, and an intermediate portion disposed between the tip portion and the base end portion, A nail driver in which the tip portion and the base end portion are solid, while a hollow portion is provided in the intermediate portion.

2. The driving force by which the driving means drives the driver toward the nail is adjusted such that the momentum imparted to the nail when the driver collides with the nail provides the impact force required for driving the nail. The nail driver according to Claim 1.

3. The driving means is, A piston to which the base end portion of the driver is fixed, A cylinder in which the piston is slidably accommodated, A pressure accumulation chamber provided on the side opposite to the driver with the piston in the cylinder interposed therebetween and filled with compressed gas, When the nail is not being driven, the piston and the driver are pulled back toward the pressure accumulation chamber to hold the piston and the driver in a standby position, while when the nail is being driven, the holding of the piston and the driver in the standby position is released, and a return mechanism for applying the pressure from the pressure accumulation chamber to the piston and the driver. The nail driver according to Claim 1 provided with.

4. The driving means includes an electric motor and a battery that supplies power to the electric motor. The nail driver according to any one of Claims 1 to 3.

5. In a driver for a nail driver which is a shaft member that applies a strike to a nail driven into an object, A tip portion that collides with the nail, A base end portion on the side opposite to the tip portion, An intermediate portion between the tip portion and the base end portion Comprising, A driver for a nail driver in which the tip portion and the base end portion are solid, while a hollow portion is provided in the intermediate portion.

6. The nail driver according to Claim 5, wherein a through hole that penetrates the intermediate portion in the longitudinal direction is provided in the hollow portion, and the inside of the through hole is the hollow portion.

7. The nail driver according to Claim 5, wherein the hollow portion is filled with a member that is lighter than the member constituting the intermediate portion.

8. The nail driver according to Claim 5, wherein a reinforcing structure for improving the mechanical strength of the intermediate portion is provided in the hollow portion.

9. The driver for a nailer according to claim 8, wherein a reinforcing tubular member is disposed in the hollow portion as the reinforcing structure.

10. The driver for a nailer according to claim 8, wherein a plurality of protrusions are formed on the surface of the intermediate portion on the hollow portion side as the reinforcing structure.

11. The driver for a nailer according to claim 8, wherein a honeycomb structure is disposed in the hollow portion as the reinforcing structure.

12. The driver for a nailer according to claim 5, wherein the tip portion is formed of a member having higher rigidity and wear resistance than the member constituting the intermediate portion.

13. The driver for a nailer according to claim 5, wherein the tip portion, the base end portion, and the intermediate portion are formed as separate members and joined to each other by welding or brazing.

14. The driver for a nailer according to claim 5, wherein the intermediate portion is formed of high-tensile steel.

15. The driver for a nailer according to claim 14, wherein a surface treatment for enhancing sliding wear resistance is applied to the outer peripheral surface of the intermediate portion.

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