JP7006298B2 - Driving tool - Google Patents

Driving tool Download PDF

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Publication number
JP7006298B2
JP7006298B2 JP2018007633A JP2018007633A JP7006298B2 JP 7006298 B2 JP7006298 B2 JP 7006298B2 JP 2018007633 A JP2018007633 A JP 2018007633A JP 2018007633 A JP2018007633 A JP 2018007633A JP 7006298 B2 JP7006298 B2 JP 7006298B2
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Japan
Prior art keywords
valve
combustion chamber
striking mechanism
head valve
inlet
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JP2018007633A
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JP2019126848A (en
Inventor
英一 渡辺
隆司 結城
裕 山本
光宏 木村
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Max Co Ltd
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Max Co Ltd
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Priority to JP2018007633A priority Critical patent/JP7006298B2/en
Application filed by Max Co Ltd filed Critical Max Co Ltd
Priority to NZ750054A priority patent/NZ750054A/en
Priority to US16/251,302 priority patent/US20190224832A1/en
Priority to EP19152498.2A priority patent/EP3524390B1/en
Priority to CN201910048652.5A priority patent/CN110053001A/en
Priority to EP19152478.4A priority patent/EP3575039B1/en
Priority to EP19152496.6A priority patent/EP3524392B1/en
Priority to US16/251,321 priority patent/US20190224833A1/en
Priority to EP20157219.5A priority patent/EP3677384B1/en
Priority to DK19152501.3T priority patent/DK3572189T3/en
Priority to DK19152496.6T priority patent/DK3524392T3/en
Priority to EP19152504.7A priority patent/EP3659750A1/en
Priority to KR1020190007083A priority patent/KR102303861B1/en
Priority to CA3030703A priority patent/CA3030703C/en
Priority to AU2019200366A priority patent/AU2019200366B2/en
Priority to TW108101978A priority patent/TWI753231B/en
Priority to KR1020190007060A priority patent/KR102375298B1/en
Priority to CN201910047487.1A priority patent/CN110053000A/en
Priority to US16/251,259 priority patent/US11338422B2/en
Priority to NZ750050A priority patent/NZ750050A/en
Priority to EP19152474.3A priority patent/EP3520967A1/en
Priority to US16/251,250 priority patent/US10898997B2/en
Priority to DK20157219.5T priority patent/DK3677384T3/en
Priority to US16/251,282 priority patent/US20190224831A1/en
Priority to EP19152499.0A priority patent/EP3575040A1/en
Priority to US16/251,202 priority patent/US11007629B2/en
Priority to CA3030700A priority patent/CA3030700C/en
Priority to TW108101980A priority patent/TW201936341A/en
Priority to EP19152501.3A priority patent/EP3572189B1/en
Priority to AU2019200363A priority patent/AU2019200363B2/en
Priority to US16/251,187 priority patent/US11279014B2/en
Priority to US16/251,222 priority patent/US10940579B2/en
Priority to EP19152463.6A priority patent/EP3524391B1/en
Publication of JP2019126848A publication Critical patent/JP2019126848A/en
Priority to US17/166,043 priority patent/US11911885B2/en
Publication of JP7006298B2 publication Critical patent/JP7006298B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

本発明は、空気と燃料の混合気体を燃焼させ、その燃焼圧で駆動される打込み工具に関する。 The present invention relates to a driving tool that burns a mixed gas of air and fuel and is driven by the combustion pressure.

圧縮空気を動力源として打撃シリンダでピストンを作動させ、ピストンに結合したドライバを駆動して釘等のファスナーを打ち込むようにした釘打機と称す打込み工具が知られている。このような打ち込み工具では、打撃シリンダの側方から圧縮空気が供給されるように、ヘッドバルブと称すバルブが構成されている。 A driving tool called a nail driving machine is known in which a piston is operated by a striking cylinder using compressed air as a power source to drive a driver coupled to the piston to drive a fastener such as a nail. In such a driving tool, a valve called a head valve is configured so that compressed air is supplied from the side of the striking cylinder.

これに対し、空気と燃料の混合気体を燃焼させ、その燃焼圧で打撃シリンダを作動させ、釘等のファスナーを打ち込むようにした釘打機と称す打込み工具が知られている。ガス燃焼式の打込み工具では、予め圧力を高めた混合気体を燃焼させることで、より燃焼圧力を高めることができる。しかし、圧力を高めた混合気体を生成するため、燃焼室に圧縮空気を供給すると、混合気体を燃焼させる前に、この圧縮空気の圧力で打撃シリンダが作動してしまう。 On the other hand, there is known a driving tool called a nail driving machine that burns a mixed gas of air and fuel, operates a striking cylinder with the combustion pressure, and drives a fastener such as a nail. In the gas combustion type driving tool, the combustion pressure can be further increased by burning the mixed gas whose pressure has been increased in advance. However, when compressed air is supplied to the combustion chamber in order to generate a mixed gas having an increased pressure, the striking cylinder is operated by the pressure of the compressed air before the mixed gas is burned.

そこで、圧縮空気と燃料との混合気体を燃焼させる燃焼室と、打撃シリンダを開閉可能に仕切るバルブを備えた打込み工具が提案されている（例えば、特許文献１参照）。 Therefore, a driving tool provided with a combustion chamber for burning a mixed gas of compressed air and fuel and a valve for partitioning the striking cylinder so as to be openable and closable has been proposed (see, for example, Patent Document 1).

特許４９３５９７８号公報Japanese Patent No. 4935978

従来、燃焼室と打撃シリンダを開閉可能に仕切るバルブについても、圧縮空気を動力源とした打込み工具と同様の構成が用いられ、打撃シリンダの側方から燃焼した高温高圧の気体が供給される構成となっている。 Conventionally, the valve that separates the combustion chamber from the striking cylinder so that it can be opened and closed has the same configuration as a driving tool that uses compressed air as a power source, and the high-temperature and high-pressure gas burned from the side of the striking cylinder is supplied. It has become.

このような構成では、バルブの移動方向に沿った端面にシール材が設けられているが、バルブが開いた状態では、シール材が気体の流路に露出する。圧縮空気と燃料との混合気体を燃焼させた気体は高温高圧であるので、シール材が気体の流路に露出すると、シール材が熱の影響を受け、耐久性が低下する。また、バルブを閉じる方向に付勢するバネが設けられているが、打撃シリンダの側方から燃焼した高温高圧の気体が供給される構成では、バネが大径化し、本体の大型化につながる。 In such a configuration, the sealing material is provided on the end face along the moving direction of the valve, but when the valve is open, the sealing material is exposed to the gas flow path. Since the gas obtained by burning the mixed gas of compressed air and fuel has a high temperature and high pressure, when the sealing material is exposed to the gas flow path, the sealing material is affected by heat and its durability is lowered. Further, although a spring is provided to urge the valve in the closing direction, in a configuration in which the high-temperature and high-pressure gas burned from the side of the striking cylinder is supplied, the diameter of the spring becomes large, which leads to an increase in the size of the main body.

本発明は、このような課題を解決するためなされたもので、シール部の耐久性を向上させ、かつ、本体の大型化を抑制した打込み工具を提供することを目的とする。 The present invention has been made to solve such a problem, and an object of the present invention is to provide a driving tool that improves the durability of the sealed portion and suppresses the increase in size of the main body.

上述した課題を解決するため、本発明は、圧縮空気と燃料との混合気体の燃焼圧で作動する打撃機構と、圧縮空気と燃料との混合気体を燃焼させる燃焼室と、打撃機構と燃焼室との間を開閉する弁体と、弁体を支持する弁支持体とを備え、燃焼室は、打撃機構の軸方向に位置するとともに、弁支持体を含み、弁支持体の周囲に空間が形成され、弁体は、弁支持体の内側の空間に入れられるとともに、弁支持体は、側面に内側の空間と燃焼室を繋ぐヘッドバルブ流入口を備え、弁体は、移動方向に沿った外周面に、弁支持体の内面に摺接するシール部を備え、シール部は、弁体がヘッドバルブ流入口を開く動作で、ヘッドバルブ流入口を通過しない位置に設けられる打込み工具である。 In order to solve the above-mentioned problems, the present invention has a striking mechanism that operates by the combustion pressure of a mixed gas of compressed air and fuel, a combustion chamber that burns a mixed gas of compressed air and fuel, and a striking mechanism and a combustion chamber. It is equipped with a valve body that opens and closes between the valve body and a valve support body that supports the valve body , and the combustion chamber is located in the axial direction of the striking mechanism, includes the valve support body, and has a space around the valve support body. Formed, the valve body is placed in the space inside the valve support, the valve support is provided with a head valve inlet on the side connecting the inner space and the combustion chamber, and the valve body is along the direction of movement. The outer peripheral surface is provided with a seal portion that is in sliding contact with the inner surface of the valve support, and the seal portion is a driving tool provided at a position where the valve body opens the head valve inlet and does not pass through the head valve inlet .

本発明では、打撃機構と燃焼室との間を開閉する弁体の外周にシール部を設けたことで、圧縮空気と燃料との混合気体を燃焼させた気体に、シール部が晒されることが抑制される。 In the present invention, by providing the seal portion on the outer periphery of the valve body that opens and closes between the striking mechanism and the combustion chamber, the seal portion may be exposed to the gas obtained by burning the mixed gas of compressed air and fuel. It is suppressed.

本発明では、圧縮空気と燃料との混合気体を燃焼させ、その燃焼圧で打撃機構を作動させる構成で、シール部の耐久性を向上させることができる。 In the present invention, the durability of the seal portion can be improved by a configuration in which a mixed gas of compressed air and fuel is burned and the striking mechanism is operated by the combustion pressure .

本実施の形態の釘打機の一例を示す全体構成図である。It is an overall block diagram which shows an example of the nail driving machine of this embodiment. 本実施の形態の釘打機の一例及び動作例を示す要部構成図である。It is a main part block diagram which shows an example and the operation example of the nail driving machine of this embodiment. 本実施の形態の釘打機の一例及び動作例を示す要部構成図である。It is a main part block diagram which shows an example and the operation example of the nail driving machine of this embodiment.

以下、図面を参照して、本発明の打込み工具の一例である釘打機の実施の形態について説明する。 Hereinafter, an embodiment of a nail driving machine, which is an example of the driving tool of the present invention, will be described with reference to the drawings.

＜本実施の形態の釘打機の構成例＞
図１は、本実施の形態の釘打機の一例を示す全体構成図、図２～図３は、本実施の形態の釘打機の一例及び動作例を示す要部構成図である。 <Structure example of the nail driving machine of this embodiment>
FIG. 1 is an overall configuration diagram showing an example of a nailing machine of the present embodiment, and FIGS. 2 to 3 are a main configuration diagram showing an example of the nailing machine of the present embodiment and an operation example.

本実施の形態の釘打機１Ａは、本体部１０と、本体部１０から延伸し、手で把持されるハンドル部１１を備える。釘打機１Ａは、本体部１０の一方の側に、ファスナーが打ち出されるノーズ部１２を備える。以下の説明では、釘打機１Ａの使用形態を考慮して、ノーズ部１２が設けられる側を下側とする。 The nailing machine 1A of the present embodiment includes a main body portion 10 and a handle portion 11 extending from the main body portion 10 and gripped by hand. The nailing machine 1A includes a nose portion 12 on which a fastener is punched out on one side of the main body portion 10. In the following description, the side where the nose portion 12 is provided is the lower side in consideration of the usage pattern of the nailing machine 1A.

釘打機１Ａは、燃料が充填された図示しない燃料タンクが着脱可能に取り付けられるタンク取付部１３が、ハンドル部１１の下方に略平行する形態で設けられる。また、釘打機１Ａは、ノーズ部１２にファスナーを共有するマガジン１４が、タンク取付部１３の下方に設けられる。更に、釘打機１Ａは、エアコンプレッサ等の供給源から圧縮空気が供給されるエアホースが接続されるエアプラグ１５が、本例ではタンク取付部１３に設けられる。 The nailing machine 1A is provided with a tank mounting portion 13 to which a fuel tank (not shown) filled with fuel is detachably attached, in a form substantially parallel to the lower part of the handle portion 11. Further, in the nailing machine 1A, a magazine 14 sharing a fastener with the nose portion 12 is provided below the tank mounting portion 13. Further, in the nailing machine 1A, an air plug 15 to which an air hose to which compressed air is supplied from a supply source such as an air compressor is connected is provided in the tank mounting portion 13 in this example.

また、釘打機１Ａは、釘打機１Ａを作動させる操作トリガ１６がハンドル部１１に設けられ、釘打機１Ａの電源となるバッテリ１７が取り付けられるバッテリ取付部１８がハンドル部１１に設けられる。 Further, in the nailing machine 1A, an operation trigger 16 for operating the nailing machine 1A is provided on the handle portion 11, and a battery mounting portion 18 to which a battery 17 serving as a power source for the nailing machine 1A is attached is provided on the handle portion 11. ..

釘打機１Ａは、圧縮空気と燃料との混合気体の燃焼圧で作動する打撃シリンダ２と、圧縮空気と燃料との混合気体を燃焼させる燃焼室３と、打撃シリンダ２と燃焼室３との間を開閉するヘッドバルブ４と、ヘッドバルブ４を支持するバルブ支持体５を備える。 The nailing machine 1A includes a striking cylinder 2 that operates by the combustion pressure of a mixed gas of compressed air and fuel, a combustion chamber 3 that burns a mixed gas of compressed air and fuel, and a striking cylinder 2 and a combustion chamber 3. A head valve 4 that opens and closes between the head valves 4 and a valve support 5 that supports the head valve 4 are provided.

打撃シリンダ２は打撃機構の一例で、マガジン１４からノーズ部１２に供給されたファスナーを打ち出すドライバ２０と、ドライバ２０が設けられたピストン２１を備える。打撃シリンダ２は、ピストン２１が摺動可能な円筒形の空間が設けられ、ピストン２１の往復動作で、ドライバ２０がノーズ部１２の延伸方向に沿って移動する。 The striking cylinder 2 is an example of a striking mechanism, and includes a driver 20 for ejecting a fastener supplied from the magazine 14 to the nose portion 12, and a piston 21 provided with the driver 20. The striking cylinder 2 is provided with a cylindrical space in which the piston 21 can slide, and the driver 20 moves along the extending direction of the nose portion 12 by the reciprocating operation of the piston 21.

また、打撃シリンダ２は、ピストン２１が当てられる緩衝材２２を備える。緩衝材２２は、弾性を有する部材で構成され、打撃シリンダ２の下部に設けられる。打撃シリンダ２では、ファスナーを打ち出す動作で移動したピストン２１が緩衝材２２に当たることで、ドライバ２０及びピストン２１の移動範囲が規制される。 Further, the striking cylinder 2 includes a cushioning material 22 to which the piston 21 is applied. The cushioning material 22 is made of an elastic member and is provided at the lower part of the striking cylinder 2. In the striking cylinder 2, the moving range of the driver 20 and the piston 21 is restricted by the piston 21 moved by the operation of pushing out the fastener hitting the cushioning material 22.

燃焼室３は、打撃シリンダ２の軸方向であるドライバ２０及びピストン２１の軸方向に沿って打撃シリンダ２の上部に設けられる。打撃シリンダ２と燃焼室３は、仕切り部５０で仕切られ、仕切り部５０に、燃焼した高温高圧の空気が通る打撃シリンダ流入口５１が設けられる。打撃シリンダ流入口５１は打撃機構流入口の一例で、打撃シリンダ２の軸方向であるドライバ２０及びピストン２１の軸上に円形の開口を設けて構成される。 The combustion chamber 3 is provided in the upper part of the striking cylinder 2 along the axial direction of the driver 20 and the piston 21 which are the axial directions of the striking cylinder 2. The striking cylinder 2 and the combustion chamber 3 are partitioned by a partition portion 50, and the striking cylinder inflow port 51 through which the burned high-temperature and high-pressure air passes is provided in the partition portion 50. The striking cylinder inlet 51 is an example of the striking mechanism inlet, and is configured by providing a circular opening on the shafts of the driver 20 and the piston 21 in the axial direction of the striking cylinder 2.

燃焼室３は、打撃シリンダ流入口５１の周囲にバルブ支持体５が設けられ、バルブ支持体５の周囲にリング状の空間が形成される。 In the combustion chamber 3, a valve support 5 is provided around the impact cylinder inlet 51, and a ring-shaped space is formed around the valve support 5.

ヘッドバルブ４は弁体の一例で、円筒形状の金属の部材で構成される。図２、図３に示すように、ヘッドバルブ４は、円筒の軸方向に沿った下方の端面が閉塞し、円形で平面状のバルブ面４０が形成される。ヘッドバルブ４は、バルブ面４０の直径が、打撃シリンダ流入口５１より大きく構成され、バルブ面４０が仕切り部５０に接した状態では、打撃シリンダ流入口５１が閉塞される。 The head valve 4 is an example of a valve body, and is composed of a cylindrical metal member. As shown in FIGS. 2 and 3, in the head valve 4, the lower end surface along the axial direction of the cylinder is closed, and a circular and planar valve surface 40 is formed. The head valve 4 has a valve surface 40 having a diameter larger than that of the striking cylinder inlet 51, and when the valve surface 40 is in contact with the partition portion 50, the striking cylinder inlet 51 is closed.

ヘッドバルブ４は、第１のシール部４１と第２のシール部４２を備える。第１のシール部４１はシール部の一例で、ヘッドバルブ４の移動方向である軸方向に沿ったバルブ面４０の外周に設けられ、第１のシール材４１ａが取り付けられる。第１のシール材４１ａは、ピストンリングと称す金属のリングで構成される。第１のシール部４１は、第１のシール材４１ａが嵌る溝が円周方向に形成され、第１のシール材４１ａが取り付けられると、第１のシール材４１ａが円周面から所定量突出する。第１のシール部４１は、本例では第１のシール材４１ａが、ヘッドバルブ４の軸方向に沿って２本取り付けられる。 The head valve 4 includes a first seal portion 41 and a second seal portion 42. The first sealing portion 41 is an example of the sealing portion, and is provided on the outer periphery of the valve surface 40 along the axial direction which is the moving direction of the head valve 4, and the first sealing material 41a is attached. The first sealing material 41a is composed of a metal ring called a piston ring. In the first sealing portion 41, a groove into which the first sealing material 41a is fitted is formed in the circumferential direction, and when the first sealing material 41a is attached, the first sealing material 41a protrudes from the circumferential surface by a predetermined amount. do. In this example, two first sealing materials 41a are attached to the first sealing portion 41 along the axial direction of the head valve 4.

第２のシール部４２はシール部の一例で、ヘッドバルブ４の軸方向に沿って、第１のシール部４１から所定の距離を開けてヘッドバルブ４の外周に設けられ、第２のシール材４２ａが取り付けられる。第２のシール材４２ａは、ゴム等の弾性体で構成された所謂Ｏリングである。第２のシール部４２は、第２のシール材４２ａが嵌る溝が円周方向に形成され、第２のシール材４２ａが取り付けられると、第２のシール材４２ａが円周面から所定量突出する。 The second sealing portion 42 is an example of a sealing portion, and is provided on the outer periphery of the head valve 4 at a predetermined distance from the first sealing portion 41 along the axial direction of the head valve 4, and is provided as a second sealing material. 42a is attached. The second sealing material 42a is a so-called O-ring made of an elastic body such as rubber. In the second sealing portion 42, a groove into which the second sealing material 42a is fitted is formed in the circumferential direction, and when the second sealing material 42a is attached, the second sealing material 42a protrudes from the circumferential surface by a predetermined amount. do.

ヘッドバルブ４は、第１のシール部４１及び第２のシール部４２が、ヘッドバルブ４の円周面から外側に突出し、かつ、第１のシール部４１に対して第２のシール部４２の直径が大きく構成される。第２のシール部４２は、第１のシール部４１と対向する側の面が、高温高圧の気体で押される作動面４３となる。作動面４３は、リング状の面である。 In the head valve 4, the first seal portion 41 and the second seal portion 42 project outward from the circumferential surface of the head valve 4, and the second seal portion 42 has a second seal portion 42 with respect to the first seal portion 41. The diameter is large. The surface of the second seal portion 42 facing the first seal portion 41 is an operating surface 43 that is pressed by a high-temperature and high-pressure gas. The working surface 43 is a ring-shaped surface.

ヘッドバルブ４は、バネ４４で仕切り部５０方向に付勢される。バネ４４は付勢部材の一例で、コイルバネで構成され、バネ４４の軸線が、打撃シリンダ２の軸上であるドライバ２０及びピストン２１の軸線上、すなわち、ヘッドバルブ４及び打撃シリンダ流入口５１の同軸上に設けられる。バネ４４は、ヘッドバルブ４の移動方向である軸方向に沿ってヘッドバルブ４に形成された上方が開口した凹部４５に入り込むことで、ヘッドバルブ４とバネ４４の一部が、軸方向に重なって配置される。このような配置をオーバーラップ配置と称す。また、バネ４４がヘッドバルブ４の凹部４５に入り込むようにするため、バネ４４はヘッドバルブ４より小径であり、バネ４４は打撃シリンダ２より小径化できる。 The head valve 4 is urged in the direction of the partition portion 50 by the spring 44. The spring 44 is an example of an urging member, and is composed of a coil spring, and the axis of the spring 44 is on the axis of the driver 20 and the piston 21 which are on the axis of the striking cylinder 2, that is, the head valve 4 and the striking cylinder inlet 51. It is provided coaxially. The spring 44 enters the concave portion 45 having an upper opening formed in the head valve 4 along the axial direction which is the moving direction of the head valve 4, so that the head valve 4 and a part of the spring 44 overlap in the axial direction. Will be placed. Such an arrangement is called an overlap arrangement. Further, in order to allow the spring 44 to enter the recess 45 of the head valve 4, the spring 44 has a smaller diameter than the head valve 4, and the spring 44 can have a smaller diameter than the striking cylinder 2.

バネ４４によりヘッドバルブ４を押す力は、作動面４３に高温高圧の気体が作用しない状態では、バルブ面４０が仕切り部５０に接した状態を保つ力である。 The force that pushes the head valve 4 by the spring 44 is a force that keeps the valve surface 40 in contact with the partition portion 50 in a state where the high-temperature and high-pressure gas does not act on the operating surface 43.

ヘッドバルブ４は、バルブ支持体５により移動可能に支持される。 The head valve 4 is movably supported by the valve support 5.

バルブ支持体５は弁支持体の一例で、円筒形状の金属の部材で構成される。図２、図３に示すように、バルブ支持体５は、本例では、円筒の軸方向に沿った下部に仕切り部５０が一体に設けられる。バルブ支持体５は、円筒形状の内側の空間にヘッドバルブ４が入れられると、ヘッドバルブ４の第１のシール部４１の第１のシール材４１ａが摺接すると共に、第２のシール部４２の第２のシール材４２ａが摺接する。バルブ支持体５は、ヘッドバルブ４の第１のシール部４１の第１のシール材４１ａが摺接する部位と、第２のシール部４２の第２のシール材４２ａが摺接する部位では、各シール部に合わせて内径が異なる。 The valve support 5 is an example of a valve support, and is composed of a cylindrical metal member. As shown in FIGS. 2 and 3, in this example, the valve support 5 is integrally provided with a partition portion 50 at the lower portion along the axial direction of the cylinder. When the head valve 4 is inserted into the space inside the cylindrical shape of the valve support 5, the first sealing material 41a of the first sealing portion 41 of the head valve 4 is in sliding contact with the second sealing portion 42. The second sealing material 42a is in sliding contact. The valve support 5 has each seal at a portion where the first sealing material 41a of the first sealing portion 41 of the head valve 4 is in sliding contact and a portion where the second sealing material 42a of the second sealing portion 42 is in sliding contact. The inner diameter is different according to the part.

バルブ支持体５は、ヘッドバルブ４が入れられると、ヘッドバルブ４の第１のシール部４１及び第２のシール部４２と、バルブ支持体５の内面の間に作動空間５２が形成される。作動空間５２は、環状の空間である。 When the head valve 4 is inserted in the valve support 5, an operating space 52 is formed between the first seal portion 41 and the second seal portion 42 of the head valve 4 and the inner surface of the valve support 5. The working space 52 is an annular space.

バルブ支持体５は、燃焼室３と作動空間５２をつなぐヘッドバルブ流入口５３を備える。ヘッドバルブ流入口５３は、ヘッドバルブ４のバルブ面４０が仕切り部５０に接した位置にある状態で、第１のシール部４１の近傍に、バルブ支持体５を貫通する開口を設けて構成される。ヘッドバルブ流入口５３が、バルブ支持体５の側面に形成されることで、燃焼室３と作動空間５２をつなぐ流路が複雑化せず、流入抵抗の増加を防ぐことができる。 The valve support 5 includes a head valve inlet 53 that connects the combustion chamber 3 and the working space 52. The head valve inflow port 53 is configured by providing an opening penetrating the valve support 5 in the vicinity of the first seal portion 41 in a state where the valve surface 40 of the head valve 4 is in contact with the partition portion 50. To. By forming the head valve inflow port 53 on the side surface of the valve support 5, the flow path connecting the combustion chamber 3 and the working space 52 is not complicated, and an increase in inflow resistance can be prevented.

ヘッドバルブ流入口５３は、図２に示すように、ヘッドバルブ４のバルブ面４０が仕切り部５０に接した位置にある状態、すなわち、打撃シリンダ流入口５１がヘッドバルブ４で閉じられている状態では、作動空間５２とつながる。 As shown in FIG. 2, the head valve inflow port 53 is in a state where the valve surface 40 of the head valve 4 is in contact with the partition portion 50, that is, a state in which the impact cylinder inflow port 51 is closed by the head valve 4. Then, it is connected to the working space 52.

これに対し、ヘッドバルブ４の作動面４３に高温高圧の気体が作用することで、図３に示すように、ヘッドバルブ４が上方に移動すると、打撃シリンダ流入口５１が開き、ヘッドバルブ流入口５３は、打撃シリンダ流入口５１とつながる。 On the other hand, when the head valve 4 moves upward due to the action of a high-temperature and high-pressure gas on the operating surface 43 of the head valve 4, the impact cylinder inflow port 51 opens and the head valve inflow port is opened. 53 is connected to the impact cylinder inlet 51.

ヘッドバルブ流入口５３を通る空気は、燃焼室３で圧縮空気と燃料との混合気体を燃焼させることで発生させた高温高圧の空気である。高温高圧の気体は、常温常圧の空気に比較して粘性が低いため、ヘッドバルブ流入口５３の開口面積が小さくても、気体の流れに対する抵抗の増加が抑制される。 The air passing through the head valve inlet 53 is high-temperature and high-pressure air generated by burning a mixed gas of compressed air and fuel in the combustion chamber 3. Since the high temperature and high pressure gas has a lower viscosity than the air at normal temperature and pressure, the increase in resistance to the gas flow is suppressed even if the opening area of the head valve inlet 53 is small.

第１のシール部４１は、外周に第１のシール材４１ａが設けられ、第１のシール材４１ａがバルブ支持体５の内面に接する。第１のシール材４１ａは溝に嵌められているので、作動空間５２に露出する部位は最小限に抑えられる。 The first sealing material 41a is provided on the outer periphery of the first sealing portion 41, and the first sealing material 41a is in contact with the inner surface of the valve support 5. Since the first sealing material 41a is fitted in the groove, the portion exposed to the working space 52 is minimized.

第２のシール部４２は、外周に第２のシール材４２ａが設けられ、第２のシール材４２ａがバルブ支持体５の内面に接する。第２のシール材４２ａは溝に嵌められているので、作動空間５２に露出する部位は最小限に抑えられる。 The second sealing material 42a is provided with a second sealing material 42a on the outer periphery thereof, and the second sealing material 42a is in contact with the inner surface of the valve support 5. Since the second sealing material 42a is fitted in the groove, the portion exposed to the working space 52 is minimized.

バルブ支持体５は、ヘッドバルブ４が当てられる緩衝材５４を備える。緩衝材５４は、弾性を有する部材で構成され、ヘッドバルブ４の上部に設けられる。バルブ支持体５では、ヘッドバルブ４の作動面４３に高温高圧の気体が作用することで移動したヘッドバルブ４が緩衝材５４に当たることで、ヘッドバルブ４の移動範囲が規制される。なお、緩衝材５４によりヘッドバルブ４の移動範囲が規制されるが、ヘッドバルブ４が緩衝材５４に当たる際、緩衝材５４の弾性変形によって衝撃を吸収するので、ヘッドバルブ流入口５３の高さは、ヘッドバルブ４のストローク以下にしておくことが好ましい。これにより、ヘッドバルブ４が緩衝材５４に当たる位置まで移動した際、ヘッドバルブ流入口５３にヘッドバルブ４が露出しないようにすることができ、ヘッドバルブ流入口５３の全体が開く。このように、ヘッドバルブ流入口５３の開口量を一定にすることで出力を安定させることができる。 The valve support 5 includes a cushioning material 54 to which the head valve 4 is applied. The cushioning material 54 is made of an elastic member and is provided on the upper portion of the head valve 4. In the valve support 5, the moving range of the head valve 4 is restricted by the head valve 4 moving due to the action of a high-temperature and high-pressure gas acting on the operating surface 43 of the head valve 4 and hitting the cushioning material 54. The moving range of the head valve 4 is restricted by the cushioning material 54, but when the head valve 4 hits the cushioning material 54, the impact is absorbed by the elastic deformation of the cushioning material 54, so that the height of the head valve inflow port 53 is increased. , It is preferable to keep the stroke of the head valve 4 or less. As a result, when the head valve 4 moves to the position where it hits the cushioning material 54, the head valve 4 can be prevented from being exposed to the head valve inlet 53, and the entire head valve inlet 53 is opened. In this way, the output can be stabilized by keeping the opening amount of the head valve inlet 53 constant.

燃焼室３は、ヘッド部３０で上部の開口が密閉される。ヘッド部３０は、点火装置３１が設けられる。また、ヘッド部３０は、図示しない燃料の供給口及び圧縮空気の供給口が設けられる。更に、ヘッド部３０に接するように緩衝材５４が設けられることで、ヘッド部３０に加わる衝撃が緩衝され、部品の耐久性向上、ヘッド部３０を燃焼室３に取り付けるボルトの緩み防止、電気ノイズの低減などの効果が得られる。 The upper opening of the combustion chamber 3 is sealed by the head portion 30. The head portion 30 is provided with an ignition device 31. Further, the head portion 30 is provided with a fuel supply port and a compressed air supply port (not shown). Further, by providing the cushioning material 54 so as to be in contact with the head portion 30, the impact applied to the head portion 30 is buffered, the durability of the parts is improved, the bolts that attach the head portion 30 to the combustion chamber 3 are prevented from loosening, and electrical noise is generated. Effects such as reduction of noise can be obtained.

釘打機１Ａは、打撃シリンダ２のドライバ２０及びピストン２１を復帰させる気体を溜めるブローバックチャンバ６を備える。ブローバックチャンバ６は、打撃シリンダ２の周囲に設けられ、緩衝材２２の近傍に設けられた流入排出口６０で打撃シリンダ２内とつながる。 The nailing machine 1A includes a driver 20 of the striking cylinder 2 and a blowback chamber 6 for storing gas for returning the piston 21. The blowback chamber 6 is provided around the striking cylinder 2 and is connected to the inside of the striking cylinder 2 by an inflow / discharge port 60 provided in the vicinity of the cushioning material 22.

釘打機１Ａは、ノーズ部１２にコンタクト部材８を備える。コンタクト部材８は、ノーズ部１２の延伸方向に沿って移動可能に設けられ、バネ８０でノーズ部１２から突出する方向に付勢される。コンタクト部材８は、燃焼室３を大気に開放する図示しない排気弁とリンク８１を介して連結されており、コンタクト部材８の動きと連動して図示しない排気弁が作動する。 The nailing machine 1A includes a contact member 8 in the nose portion 12. The contact member 8 is provided so as to be movable along the extending direction of the nose portion 12, and is urged by the spring 80 in the direction of projecting from the nose portion 12. The contact member 8 is connected to an exhaust valve (not shown) that opens the combustion chamber 3 to the atmosphere via a link 81, and an exhaust valve (not shown) operates in conjunction with the movement of the contact member 8.

＜本実施の形態の釘打機の動作例＞
次に、各図を参照して本実施の形態の釘打機１Ａの動作について説明する。初期状態では、操作トリガ１６が引かれておらず、また、コンタクト部材８が被打込材に押しけられておらず、バネ８０で付勢されてノーズ部１２から突出した初期位置にある。 <Operation example of the nail driving machine of this embodiment>
Next, the operation of the nailing machine 1A of the present embodiment will be described with reference to each figure. In the initial state, the operation trigger 16 is not pulled, the contact member 8 is not pushed against the material to be driven, and the contact member 8 is urged by the spring 80 and is in the initial position protruding from the nose portion 12.

コンタクト部材８が初期位置にある状態では、図示しない排気弁により燃焼室３が大気に開放された状態である。 When the contact member 8 is in the initial position, the combustion chamber 3 is opened to the atmosphere by an exhaust valve (not shown).

また、ヘッドバルブ４は、バネ４４で押圧されてバルブ面４０が仕切り部５０に接した位置にある状態、すなわち、打撃シリンダ流入口５１がヘッドバルブ４で閉じられている状態である。この状態では、ヘッドバルブ流入口５３は作動空間５２とつながる。 Further, the head valve 4 is in a state where the valve surface 40 is pressed by the spring 44 and is in contact with the partition portion 50, that is, the impact cylinder inflow port 51 is closed by the head valve 4. In this state, the head valve inlet 53 is connected to the working space 52.

コンタクト部材８が被打込材に押し付けられると、コンタクト部材８の動きがリンク８１で図示しない排気弁に伝達され、燃焼室３が密閉された状態になる。 When the contact member 8 is pressed against the material to be driven, the movement of the contact member 8 is transmitted to an exhaust valve (not shown) by the link 81, and the combustion chamber 3 is sealed.

また、コンタクト部材８と操作トリガ１６の操作に連動して、図示しない空気弁と燃料弁が開き、燃焼室３に気化した燃料と圧縮空気が供給される。 Further, in conjunction with the operation of the contact member 8 and the operation trigger 16, an air valve and a fuel valve (not shown) are opened, and vaporized fuel and compressed air are supplied to the combustion chamber 3.

燃焼室３に圧縮空気が供給されると、燃焼室３内の圧力が上がる。但し、圧縮空気による燃焼室３内の圧力上昇では、ヘッドバルブ４は、バネ４４で押圧されてバルブ面４０が仕切り部５０に接した状態を保ち、打撃シリンダ流入口５１がヘッドバルブ４で閉じられる。よって、圧縮空気の供給で燃焼室３内が圧力上昇しても、打撃シリンダ２内では圧力上昇が発生せず、ピストン２１は作動しない。 When compressed air is supplied to the combustion chamber 3, the pressure in the combustion chamber 3 rises. However, when the pressure in the combustion chamber 3 rises due to compressed air, the head valve 4 is pressed by the spring 44 to keep the valve surface 40 in contact with the partition portion 50, and the impact cylinder inflow port 51 is closed by the head valve 4. Be done. Therefore, even if the pressure inside the combustion chamber 3 rises due to the supply of compressed air, the pressure rise does not occur in the striking cylinder 2, and the piston 21 does not operate.

コンタクト部材８が被打込材に押し付けられ、操作トリガ１６が操作されることで図示しない空気弁と燃料弁が開いた後、所定のタイミングで点火装置３１が作動すると、燃焼室３内の圧縮空気と燃料との混合気体が燃焼する。燃焼室３内で混合気体が燃焼すると、燃焼室３内の圧力が上がり、ヘッド支持体５のヘッドバルブ流入口５３から作動空間５２に高温高圧の気体が流入する。 After the contact member 8 is pressed against the material to be driven and the operation trigger 16 is operated to open the air valve and the fuel valve (not shown), when the ignition device 31 is operated at a predetermined timing, the compression in the combustion chamber 3 is performed. A mixed gas of air and fuel burns. When the mixed gas burns in the combustion chamber 3, the pressure in the combustion chamber 3 rises, and the high-temperature and high-pressure gas flows into the working space 52 from the head valve inlet 53 of the head support 5.

作動空間５２内の圧力が上がると、ヘッドバルブ４の作動面４３に高温高圧の気体が作用することで、ヘッドバルブ４がバネ４４を圧縮しながら上方に移動する。ここで、作動空間５２内の圧力が上がると、第１のシール部４１の作動空間５２と対向する面にも圧力が掛かる。但し作動面４３の方が面積が大きいので、ヘッドバルブ４がバネ４４を圧縮しながら上昇する。 When the pressure in the working space 52 rises, a high-temperature and high-pressure gas acts on the working surface 43 of the head valve 4, so that the head valve 4 moves upward while compressing the spring 44. Here, when the pressure in the working space 52 rises, the pressure is also applied to the surface of the first seal portion 41 facing the working space 52. However, since the working surface 43 has a larger area, the head valve 4 rises while compressing the spring 44.

図３に示すように、ヘッドバルブ４が上方に移動すると、打撃シリンダ流入口５１が開き、ヘッドバルブ流入口５３は、打撃シリンダ流入口５１とつながる。これにより、高温高圧の気体が、燃焼室３から打撃シリンダ流入口５１を通り打撃シリンダ２に流入し、打撃シリンダ２の圧力が上がる。 As shown in FIG. 3, when the head valve 4 moves upward, the striking cylinder inlet 51 opens, and the head valve inlet 53 is connected to the striking cylinder inlet 51. As a result, the high-temperature and high-pressure gas flows from the combustion chamber 3 through the striking cylinder inlet 51 into the striking cylinder 2, and the pressure of the striking cylinder 2 rises.

打撃シリンダ２の圧力が上がると、ピストン２１が押され、ピストン２１及びドライバ２０がファスナーを打ち出す方向に移動し、ファスナーの打ち込み動作が行われる。ピストン２１及びドライバ２０がファスナーを打ち出す方向に移動すると、ピストン２１で仕切られた打撃シリンダ２内の下側の気体（空気）が、流入排出口６０からブローバックチャンバ６に流入する。更に、ピストン２１が緩衝材２２を圧縮変形させながら流入排出口６０を通過するため、ブローバックチャンバ６には、ピストン２１を駆動させた高温高圧の気体の一部が流入する。 When the pressure of the striking cylinder 2 rises, the piston 21 is pushed, the piston 21 and the driver 20 move in the direction of launching the fastener, and the fastener driving operation is performed. When the piston 21 and the driver 20 move in the direction of launching the fastener, the lower gas (air) in the striking cylinder 2 partitioned by the piston 21 flows into the blowback chamber 6 from the inflow / discharge port 60. Further, since the piston 21 passes through the inflow / discharge port 60 while compressing and deforming the cushioning material 22, a part of the high-temperature and high-pressure gas that drives the piston 21 flows into the blowback chamber 6.

燃焼室３から高温高圧の気体が打撃シリンダ流入口５１を通り打撃シリンダ２に流入して、燃焼室３内の圧力が低下することで、ヘッドバルブ４は、バネ４４で押圧されてバルブ面４０が仕切り部５０に接した位置に移動し、打撃シリンダ流入口５１がヘッドバルブ４で閉じられる。 High-temperature and high-pressure gas flows from the combustion chamber 3 into the striking cylinder 2 through the striking cylinder inlet 51, and the pressure in the combustion chamber 3 drops, so that the head valve 4 is pressed by the spring 44 and the valve surface 40. Moves to a position in contact with the partition portion 50, and the impact cylinder inflow port 51 is closed by the head valve 4.

更に、ピストン２１及びドライバ２０がファスナーを打ち出す方向に移動し、ピストン２１が下死点まで移動して緩衝材２２に当たると、緩衝材２２の弾性でピストン２１及びドライバ２０が上方に移動しようとする。ピストン２１が流入排出口６０を通過して、流入排出口６０の上側に移動すると、圧力が高まっているブローバックチャンバ６内の気体（空気）が打撃シリンダ２内に流入し、ピストン２１を押すことで、ピストン２１及びドライバ２０が上死点に復帰する。 Further, when the piston 21 and the driver 20 move in the direction of launching the fastener and the piston 21 moves to the bottom dead center and hits the cushioning material 22, the piston 21 and the driver 20 tend to move upward due to the elasticity of the cushioning material 22. .. When the piston 21 passes through the inflow / discharge port 60 and moves to the upper side of the inflow / discharge port 60, the gas (air) in the blowback chamber 6 where the pressure is increasing flows into the striking cylinder 2 and pushes the piston 21. As a result, the piston 21 and the driver 20 return to the top dead center.

コンタクト部材８が被打込材から離れると、図示しない排気弁が開き、燃焼室３が大気に開放される。 When the contact member 8 separates from the material to be driven, an exhaust valve (not shown) opens and the combustion chamber 3 is opened to the atmosphere.

本実施の形態の釘打機１Ａでは、圧縮空気と燃料を燃焼室３に供給し、混合気体を燃焼させることで高圧の気体を発生させ、この高圧の気体で打撃シリンダ２のピストン２１を押すことで、ピストン２１及びドライバ２０でファスナーを押す力が強くなる。 In the nailing machine 1A of the present embodiment, compressed air and fuel are supplied to the combustion chamber 3 and a high-pressure gas is generated by burning the mixed gas, and the high-pressure gas pushes the piston 21 of the striking cylinder 2. As a result, the force for pushing the fastener with the piston 21 and the driver 20 becomes stronger.

これにより、常圧の気体を使用した従来のガス燃焼式釘打機と比較して、ファスナーを打ち込むための出力を高めることができる。 As a result, the output for driving the fastener can be increased as compared with the conventional gas combustion type nailing machine using a gas at normal pressure.

また、燃焼室３と打撃シリンダ２との間の打撃シリンダ流入口５１を開閉するヘッドバルブ４を備えることで、燃焼室３に圧縮空気を供給しただけでは、打撃シリンダ２を作動しないようにすることができる。更に、ヘッドバルブ４を混合気体の燃焼圧で作動させることで、ヘッドバルブ４を駆動するための別途の動力源が不要である。これにより、ヘッドバルブ４及びその駆動機構の構造が簡略化でき、装置の小型化、低コスト化を図ることができる。 Further, by providing a head valve 4 for opening and closing the striking cylinder inlet 51 between the combustion chamber 3 and the striking cylinder 2, the striking cylinder 2 is prevented from operating only by supplying compressed air to the combustion chamber 3. be able to. Further, by operating the head valve 4 with the combustion pressure of the mixed gas, a separate power source for driving the head valve 4 is not required. As a result, the structure of the head valve 4 and its drive mechanism can be simplified, and the size and cost of the device can be reduced.

更に、燃焼室３は、ドライバ２０及びピストン２１の軸方向に沿って打撃シリンダ２の上部に設けられることで、燃焼室を打撃シリンダ２の周囲に設ける構造と比較して、燃焼室３の容積を小さくすることなく、燃焼室３を小径化できる。燃焼室３内は高圧になるため、燃焼室３は強度を持たせる必要があるが、燃焼室３を小径化できることで、燃焼室３を薄肉化を図っても、強度を確保することができ、装置全体の小型化、軽量化が可能である。 Further, the combustion chamber 3 is provided in the upper part of the striking cylinder 2 along the axial direction of the driver 20 and the piston 21, so that the volume of the combustion chamber 3 is compared with the structure in which the combustion chamber is provided around the striking cylinder 2. The diameter of the combustion chamber 3 can be reduced without reducing the size of the combustion chamber 3. Since the inside of the combustion chamber 3 becomes high pressure, it is necessary to give strength to the combustion chamber 3, but since the diameter of the combustion chamber 3 can be reduced, the strength can be secured even if the combustion chamber 3 is made thinner. It is possible to reduce the size and weight of the entire device.

また、燃焼室３と打撃シリンダ２をつなぐ打撃シリンダ流入口５１は、ドライバ２０及びピストン２１の軸上に設けられることで、打撃シリンダ２より打撃シリンダ流入口５１を小径化でき、結果、ヘッドバルブ４を打撃シリンダ２より小径化できる。ヘッドバルブ４を小径化できることで、ヘッドバルブ４の移動速度を向上させることができ、打撃シリンダ流入口５１を開くのに要する時間を短縮できる。 Further, the striking cylinder inlet 51 connecting the combustion chamber 3 and the striking cylinder 2 is provided on the shafts of the driver 20 and the piston 21, so that the striking cylinder inlet 51 can be made smaller in diameter than the striking cylinder 2, and as a result, the head valve. 4 can be made smaller in diameter than the striking cylinder 2. Since the diameter of the head valve 4 can be reduced, the moving speed of the head valve 4 can be improved, and the time required to open the impact cylinder inlet 51 can be shortened.

更に、ヘッドバルブ４を作動させる気体は高温高圧であるため、常圧の気体を燃焼させた場合と比較して、粘性が低い。これにより、ヘッドバルブ４を作動させる気体が通るヘッドバルブ流入口５３の小径化も可能であり、燃焼室３、ヘッドバルブ４の周辺構造の小径化が可能である。 Further, since the gas that operates the head valve 4 has a high temperature and high pressure, the viscosity is low as compared with the case where the gas at normal pressure is burned. As a result, it is possible to reduce the diameter of the head valve inlet 53 through which the gas that operates the head valve 4 passes, and it is possible to reduce the diameter of the peripheral structures of the combustion chamber 3 and the head valve 4.

ヘッドバルブ４に設けられる第１のシール部４１は、外周に第１のシール材４１ａが設けられ、第１のシール材４１ａがバルブ支持体５の内面に接する。第１のシール材４１ａは溝に嵌められているので、作動空間５２に露出する部位は最小限に抑えられる。ヘッドバルブ４が打撃シリンダ流入口５１及びヘッドバルブ流入口５３を開いているときは、ヘッドバルブ４の下方の打撃シリンダ流入口５１から高温高圧の気体が回り込むが、第１のシール材４１ａは溝に嵌められているので、露出する部位は最小限に抑えられる。 The first sealing portion 41 provided on the head valve 4 is provided with a first sealing material 41a on the outer periphery thereof, and the first sealing material 41a is in contact with the inner surface of the valve support 5. Since the first sealing material 41a is fitted in the groove, the portion exposed to the working space 52 is minimized. When the head valve 4 opens the striking cylinder inlet 51 and the head valve inlet 53, high-temperature and high-pressure gas wraps around from the striking cylinder inlet 51 below the head valve 4, but the first sealing material 41a has a groove. Since it is fitted in, the exposed part is minimized.

なお、ヘッドバルブ４の作動面４３に高温高圧の気体が作用することで、ヘッドバルブ４が打撃シリンダ流入口５１及びヘッドバルブ流入口５３を開く動作で、第１のシール部４１がヘッドバルブ流入口５３を通過するため、第１のシール材４１ａが高温高圧の気体に晒される。但し、第１のシール材４１ａは金属であるので、第１のシール材４１ａが熱の影響を受けることが抑制される。 When the high temperature and high pressure gas acts on the operating surface 43 of the head valve 4, the head valve 4 opens the striking cylinder inlet 51 and the head valve inlet 53, and the first seal portion 41 causes the head valve flow. As it passes through the inlet 53, the first sealing material 41a is exposed to a high temperature and high pressure gas. However, since the first sealing material 41a is made of metal, it is possible to prevent the first sealing material 41a from being affected by heat.

また、第２のシール部４２は、外周に第２のシール材４２ａが設けられ、第２のシール材４２ａがバルブ支持体５の内面に接する。第２のシール材４２ａは溝に嵌められているので、作動空間５２に露出する部位は最小限に抑えられる。 Further, the second sealing material 42a is provided with a second sealing material 42a on the outer periphery thereof, and the second sealing material 42a is in contact with the inner surface of the valve support 5. Since the second sealing material 42a is fitted in the groove, the portion exposed to the working space 52 is minimized.

ヘッドバルブ４の作動面４３に高温高圧の気体が作用することで、ヘッドバルブ４がヘッドバルブ流入口５３を開く動作でも、第２のシール材４２ａの露出が抑制されているので、第２のシール材４２ａが熱の影響を受けることが抑制される。更に、ヘッドバルブ４がヘッドバルブ流入口５３を開く動作で、第２のシール部４２がヘッドバルブ流入口５３を通過しないため、第２のシール材４２ａが高温高圧の気体に晒されることが抑制される。 Since the high temperature and high pressure gas acts on the operating surface 43 of the head valve 4, the exposure of the second sealing material 42a is suppressed even when the head valve 4 opens the head valve inlet 53, so that the second sealing material 42a is suppressed. The sealing material 42a is suppressed from being affected by heat. Further, when the head valve 4 opens the head valve inlet 53, the second seal portion 42 does not pass through the head valve inlet 53, so that the second seal material 42a is suppressed from being exposed to a high temperature and high pressure gas. Will be done.

よって、シール材の耐久性が向上し、長期間の使用で、所望の性能を維持することができる。また、ヘッドバルブ４の一方のシール材（第１のシール材４１ａ）が金属で構成されることで、バルブ支持体５との摩擦が低減され、ヘッドバルブ４の小径化と合わせて、ヘッドバルブ４の移動速度を向上させることができる。更に、ヘッドバルブ４は、金属で構成されたシール材を用いることで、ヘッドバルブ４の移動方向に沿った端面にシール材を配置し、気体の流路に露出するように構成とした場合でも、シール部の耐久性を多少向上させることができる。 Therefore, the durability of the sealing material is improved, and the desired performance can be maintained even after long-term use. Further, since one of the sealing materials (first sealing material 41a) of the head valve 4 is made of metal, friction with the valve support 5 is reduced, and the head valve 4 is made smaller in diameter. The movement speed of 4 can be improved. Further, even when the head valve 4 uses a sealing material made of metal, the sealing material is arranged on the end face along the moving direction of the head valve 4 so as to be exposed to the gas flow path. , The durability of the seal portion can be improved to some extent.

但し、金属で構成されたシール材を使用する場合、ゴム等の弾性体のシール材を使用する場合と比較して、高い接触圧力が必要になるため、高荷重ばねの使用が必須となる。そこで、本実施の形態の釘打機１Ａでは、ヘッドバルブ４の中央であるヘッドバルブ４の同軸上にバネ４４を配置することで、本体部１０を大型化することなく、高荷重のバネの使用を可能にしている。更に、ヘッドバルブ４の軸方向に凹部４５を形成してバネ４４が入り込むようにオーバーラップ配置することで、バネ４４がヘッドバルブ４から突出する量を少なくでき、本体部１０の高さ方向の寸法が大きくなることを抑制することができる。また、バネ４４がヘッドバルブ４の凹部４５に入り込むようにするため、バネ４４は打撃シリンダ２より小径化でき、本体部１０の径方向の寸法が大きくなることを抑制することができる。 However, when a sealing material made of metal is used, a higher contact pressure is required as compared with the case where an elastic sealing material such as rubber is used, so that a high load spring must be used. Therefore, in the nailing machine 1A of the present embodiment, by arranging the spring 44 on the same axis as the head valve 4 which is the center of the head valve 4, the high load spring can be used without increasing the size of the main body 10. It is possible to use. Further, by forming a recess 45 in the axial direction of the head valve 4 and arranging them so as to overlap each other so that the spring 44 can enter, the amount of the spring 44 protruding from the head valve 4 can be reduced, and the amount of the spring 44 protruding from the head valve 4 can be reduced in the height direction of the main body 10. It is possible to suppress the increase in size. Further, since the spring 44 is made to enter the recess 45 of the head valve 4, the diameter of the spring 44 can be made smaller than that of the striking cylinder 2, and it is possible to suppress the increase in the radial dimension of the main body portion 10.

１Ａ・・・釘打機、１０・・・本体部、１１・・・ハンドル部、１２・・・ノーズ部、１３・・・タンク取付部、１４・・・マガジン、１５・・・エアプラグ、１６・・・操作トリガ、１７・・・バッテリ、１８・・・バッテリ取付部、２・・・打撃シリンダ（打撃機構）、２０・・・ドライバ、２１・・・ピストン、２２・・・緩衝材、３・・・燃焼室、３０・・・ヘッド部、３１・・・点火装置、４・・・ヘッドバルブ（弁体）、４０・・・バルブ面、４１・・・第１のシール部、４１ａ・・・第１のシール材、４２・・・第２のシール部、４２ａ・・・第２のシール材、４３・・・作動面、４４・・・バネ、４５・・・凹部、５・・・バルブ支持体（弁支持体）、５０・・・仕切り部、５１・・・打撃シリンダ流入口（打撃機構流入口）、５２・・・作動空間、５３・・・ヘッドバルブ流入口、５４・・・緩衝材、６・・・ブローバックチャンバ、６０・・・流入排出口、８・・・コンタクト部材、８０・・・バネ、８１・・・リンク 1A ... Nailer, 10 ... Main body, 11 ... Handle, 12 ... Nose, 13 ... Tank mounting, 14 ... Magazine, 15 ... Air plug, 16 ... operation trigger, 17 ... battery, 18 ... battery mounting part, 2 ... striking cylinder (striking mechanism), 20 ... driver, 21 ... piston, 22 ... cushioning material, 3 ... Combustion chamber, 30 ... Head part, 31 ... Ignition device, 4 ... Head valve (valve body), 40 ... Valve surface, 41 ... First seal part, 41a ... 1st sealing material, 42 ... 2nd sealing part, 42a ... 2nd sealing material, 43 ... working surface, 44 ... spring, 45 ... concave, 5 ... .. Valve support (valve support), 50 ... partition, 51 ... striking cylinder inlet (impact mechanism inlet), 52 ... working space, 53 ... head valve inlet, 54 ... Buffer material, 6 ... Blowback chamber, 60 ... Inflow / discharge port, 8 ... Contact member, 80 ... Spring, 81 ... Link

Claims (7)

圧縮空気と燃料との混合気体の燃焼圧で作動する打撃機構と、
圧縮空気と燃料との混合気体を燃焼させる燃焼室と、
前記打撃機構と前記燃焼室との間を開閉する弁体と、
前記弁体を支持する弁支持体と
を備え、
前記燃焼室は、前記打撃機構の軸方向に位置するとともに、前記弁支持体を含み、前記弁支持体の周囲に空間が形成され、
前記弁体は、前記弁支持体の内側の空間に入れられるとともに、
前記弁支持体は、側面に前記内側の空間と前記燃焼室を繋ぐヘッドバルブ流入口を備え、
前記弁体は、移動方向に沿った外周面に、前記弁支持体の内面に摺接するシール部を備え、
前記シール部は、前記弁体が前記ヘッドバルブ流入口を開く動作で、前記ヘッドバルブ流入口を通過しない位置に設けられる
打込み工具。 A striking mechanism operated by the combustion pressure of a mixed gas of compressed air and fuel,
A combustion chamber that burns a mixed gas of compressed air and fuel,
A valve body that opens and closes between the striking mechanism and the combustion chamber,
With a valve support that supports the valve body
Equipped with
The combustion chamber is located in the axial direction of the striking mechanism, includes the valve support, and a space is formed around the valve support.
The valve body is placed in the space inside the valve support, and the valve body is placed in the space inside the valve support.
The valve support is provided with a head valve inlet connecting the inner space and the combustion chamber on the side surface.
The valve body is provided with a sealing portion that is in sliding contact with the inner surface of the valve support on the outer peripheral surface along the moving direction.
The seal portion is provided at a position where the valve body does not pass through the head valve inlet when the valve body opens the head valve inlet.
Driving tool. 前記シール部は、前記弁支持体の内面と摺接する金属の第１のシール材が取り付けられた第１のシール部と、前記弁体が前記ヘッドバルブ流入口を開く動作で、前記ヘッドバルブ流入口を通過しない位置に設けられ、前記弁支持体の内面に摺接する弾性体で構成される第２のシール材が取り付けられた第２のシール部を備えた
請求項１に記載の打込み工具。 The seal portion is a first seal portion to which a first metal sealing material that is in sliding contact with the inner surface of the valve support is attached, and the valve body is an operation of opening the head valve inlet, and the head valve flow. The driving tool according to claim 1, further comprising a second sealing portion provided at a position not passing through the inlet and to which a second sealing material composed of an elastic body sliding in contact with the inner surface of the valve support is attached . 前記打撃機構と前記燃焼室を仕切る仕切り部に、前記燃焼室から前記打撃機構に気体を流入させる打撃機構流入口を備え、
前記打撃機構流入口は、前記打撃機構の軸方向に前記打撃機構のピストンより小径の開口を設けて構成される
請求項１または請求項２に記載の打込み工具。 The partition portion that separates the striking mechanism from the combustion chamber is provided with a striking mechanism inlet that allows gas to flow from the combustion chamber into the striking mechanism.
The driving tool according to claim 1 or 2 , wherein the striking mechanism inlet is provided with an opening having a diameter smaller than that of the piston of the striking mechanism in the axial direction of the striking mechanism . 前記弁体を付勢するコイルバネを、前記打撃機構のドライバの軸線上に備えた
請求項１～請求項３の何れか１項に記載の打込み工具。 The driving tool according to any one of claims 1 to 3 , wherein the coil spring for urging the valve body is provided on the axis of the driver of the striking mechanism . 前記コイルバネは、前記弁体の移動方向に沿って前記弁体に形成された凹部に入り込む
請求項４に記載の打込み工具。 The driving tool according to claim 4 , wherein the coil spring enters a recess formed in the valve body along the moving direction of the valve body . 前記コイルバネは、前記打撃機構のピストンより小径である
請求項４または請求項５に記載の打込み工具。 The coil spring has a smaller diameter than the piston of the striking mechanism.
The driving tool according to claim 4 or 5 . 前記弁体は円筒形状で、前記打撃機構のピストンより小径で、前記打撃機構の軸方向に沿って前記燃焼室の内部に設けられる
請求項４～請求項６の何れか１項に記載の打込み工具。 The driving according to any one of claims 4 to 6 , wherein the valve body has a cylindrical shape, has a smaller diameter than the piston of the striking mechanism, and is provided inside the combustion chamber along the axial direction of the striking mechanism. tool.
JP2018007633A 2018-01-19 2018-01-19 Driving tool Active JP7006298B2 (en)

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JP2018007633A JP7006298B2 (en) 2018-01-19 2018-01-19 Driving tool
AU2019200363A AU2019200363B2 (en) 2018-01-19 2019-01-18 Driving tool
EP19152498.2A EP3524390B1 (en) 2018-01-19 2019-01-18 Driving tool
CN201910048652.5A CN110053001A (en) 2018-01-19 2019-01-18 Driver
EP19152478.4A EP3575039B1 (en) 2018-01-19 2019-01-18 Driving tool
EP19152496.6A EP3524392B1 (en) 2018-01-19 2019-01-18 Driving tool
US16/251,321 US20190224833A1 (en) 2018-01-19 2019-01-18 Driving tool
EP20157219.5A EP3677384B1 (en) 2018-01-19 2019-01-18 Driving tool
NZ750050A NZ750050A (en) 2018-01-19 2019-01-18 Driving tool
DK19152496.6T DK3524392T3 (en) 2018-01-19 2019-01-18 POWER TOOL
EP19152504.7A EP3659750A1 (en) 2018-01-19 2019-01-18 Driving tool
KR1020190007083A KR102303861B1 (en) 2018-01-19 2019-01-18 Driving tool
CA3030703A CA3030703C (en) 2018-01-19 2019-01-18 Driving tool
AU2019200366A AU2019200366B2 (en) 2018-01-19 2019-01-18 Driving tool
TW108101978A TWI753231B (en) 2018-01-19 2019-01-18 Break in tool
KR1020190007060A KR102375298B1 (en) 2018-01-19 2019-01-18 Driving tool
CN201910047487.1A CN110053000A (en) 2018-01-19 2019-01-18 Driver
US16/251,259 US11338422B2 (en) 2018-01-19 2019-01-18 Driving tool
NZ750054A NZ750054A (en) 2018-01-19 2019-01-18 Driving tool
DK19152501.3T DK3572189T3 (en) 2018-01-19 2019-01-18 Recovery tool
CA3030700A CA3030700C (en) 2018-01-19 2019-01-18 Driving tool
DK20157219.5T DK3677384T3 (en) 2018-01-19 2019-01-18 RECOVERY TOOL
US16/251,282 US20190224831A1 (en) 2018-01-19 2019-01-18 Driving tool
EP19152499.0A EP3575040A1 (en) 2018-01-19 2019-01-18 Driving tool
US16/251,202 US11007629B2 (en) 2018-01-19 2019-01-18 Gas combustion type driving tool
US16/251,250 US10898997B2 (en) 2018-01-19 2019-01-18 Driving tool
TW108101980A TW201936341A (en) 2018-01-19 2019-01-18 Driving tool
EP19152501.3A EP3572189B1 (en) 2018-01-19 2019-01-18 Driving tool
US16/251,302 US20190224832A1 (en) 2018-01-19 2019-01-18 Driving tool
US16/251,187 US11279014B2 (en) 2018-01-19 2019-01-18 Gas combustion type driving tool
US16/251,222 US10940579B2 (en) 2018-01-19 2019-01-18 Driving tool
EP19152463.6A EP3524391B1 (en) 2018-01-19 2019-01-18 Gas combustion type driving tool
EP19152474.3A EP3520967A1 (en) 2018-01-19 2019-01-18 Gas combustion type driving tool
US17/166,043 US11911885B2 (en) 2018-01-19 2021-02-03 Driving tool

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