JP2019126848A - Placing tool - Google Patents

Abstract

To provide a nailing machine improving durability of a seal part provided to a valve body partitioning a combustion chamber and a striking mechanism in such a configuration as burning a gas mixture of compressed air with fuel and actuating the striking mechanism by combustion pressure resulting from burning.SOLUTION: A nailing machine comprises: a striking cylinder 2 actuated by the combustion pressure of a gas mixture of a compressed air and a fuel; a combustion chamber 3 burning the gas mixture; a head valve 4 opening or closing a partition part between the striking cylinder 2 and the combustion chamber 3; and a valve support 5 supporting the hear valve 4. The head valve 4 comprises first and second seal parts 41 and 42 on the outer periphery slide-contacting with the valve support 5, and the first seal part 41 is equipped with a first seal material 41a composed of a metal.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a driving tool which burns a mixture of air and fuel and is driven by the combustion pressure.

  2. Description of the Related Art A driving tool called a nailing machine is known in which a piston is operated by a striking cylinder using compressed air as a power source, and a driver coupled to the piston is driven 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.

  On the other hand, a driving tool called a nail driver is known in which a mixed gas of air and fuel is burned, a hammering cylinder is operated with the combustion pressure, and a fastener such as a nail is driven. 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 with increased pressure, the striking cylinder is operated with the pressure of the compressed air before the mixed gas is combusted.

  In view of the above, there has been proposed 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 able to open and close (for example, see Patent Document 1).

Japanese Patent No. 4935978

  Conventionally, the valve that partitions the combustion chamber and the striking cylinder so as to be openable and closable has the same structure as the driving tool using compressed air as a power source, and is supplied with high-temperature and high-pressure gas combusted from the side of the striking cylinder. It has become.

  In such a configuration, the seal material is provided on the end face along the moving direction of the valve, but in the state where the valve is open, the seal material is exposed to the gas flow path. Since the gas obtained by burning the mixed gas of compressed air and fuel is at high temperature and high pressure, when the seal material is exposed to the gas flow path, the seal material is affected by heat and the durability is lowered. In addition, a spring that biases the valve in the closing direction is provided. However, in a configuration in which high-temperature and high-pressure gas combusted from the side of the striking cylinder is supplied, the spring has a large diameter, leading to an increase in the size of the main body.

  The present invention has been made to solve such a problem, and an object thereof is to provide a driving tool in which the durability of the seal portion is improved and the enlargement of the main body is suppressed.

  In order to solve the above-described problems, the present invention provides a striking mechanism that operates with a combustion pressure of a mixed gas of compressed air and fuel, a combustion chamber that combusts a mixed gas of compressed air and fuel, a striking mechanism, and a combustion chamber. The valve body is a driving tool provided with a seal portion on the outer peripheral surface along the moving direction.

  In the present invention, since the seal portion is provided 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.

  Further, the present invention provides an impact mechanism that operates with a combustion pressure of a mixed gas of compressed air and fuel, a combustion chamber that combusts a mixed gas of compressed air and fuel, and opens and closes between the impact mechanism and the combustion chamber. The driving tool includes a valve body and a valve support body that supports the valve body, and a biasing member that biases the valve body on the shaft of the striking mechanism.

  In the present invention, the urging member can be reduced in size by providing the urging member for urging the valve body on the shaft of the striking mechanism.

  In the present invention, the mixed gas of compressed air and fuel is burned, and the striking mechanism is operated by the combustion pressure, whereby the durability of the seal portion can be improved. Further, the biasing member can be miniaturized, and the enlargement of the main body can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows an example of the nail driver of this Embodiment. It is a principal part block diagram which shows an example and operation example of the nail driver of this Embodiment. It is a principal part block diagram which shows an example and operation example of the nail driver of this Embodiment.

  Hereinafter, with reference to the drawings, an embodiment of a nailing machine which is an example of a driving tool according to the present invention will be described.

<Example of configuration of nailing machine of this embodiment>
FIG. 1 is an overall configuration diagram illustrating an example of a nailing machine according to the present embodiment, and FIGS. 2 to 3 are main part configuration diagrams illustrating an example and an operation example of the nailing machine according to the present embodiment.

  The nailing machine 1A according to the present embodiment includes a main body portion 10 and a handle portion 11 that extends from the main body portion 10 and is gripped by a hand. The nailing machine 1A is provided with a nose portion 12 on one side of the main body portion 10 in which a fastener is punched out. In the following description, the side on which the nose portion 12 is provided is taken as the lower side in consideration of the usage pattern of the nailing machine 1A.

  In the nailing machine 1A, a tank mounting portion 13 to which a fuel tank (not shown) filled with fuel is detachably mounted is provided substantially parallel to the lower side of the handle portion 11. In the nailing machine 1 </ b> A, 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.

  Further, in the nail driver 1A, an operation trigger 16 for operating the nail driver 1A is provided in the handle portion 11, and a battery mounting portion 18 to which a battery 17 serving as a power source of the nail driver 1A is attached is provided in the handle portion 11. .

  The nailing machine 1A includes a striking cylinder 2 that operates with a combustion pressure of a mixed gas of compressed air and fuel, a combustion chamber 3 that combusts a mixed gas of compressed air and fuel, a striking cylinder 2 and a combustion chamber 3. A head valve 4 for opening and closing the space and a valve support 5 for supporting the head valve 4 are provided.

  The striking cylinder 2 is an example of a striking mechanism, and includes a driver 20 that ejects 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 motion of the piston 21.

  Further, the striking cylinder 2 is provided with a shock absorber 22 to which the piston 21 is applied. The shock absorbing material 22 is formed of a member having elasticity, and provided at the lower part of the striking cylinder 2. In the striking cylinder 2, the movement range of the driver 20 and the piston 21 is restricted by the fact that the piston 21 moved by the operation of punching out the fasteners strikes the shock absorbing material 22.

  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 that are the axial direction of the striking cylinder 2. The striking cylinder 2 and the combustion chamber 3 are partitioned by a partition 50, and a striking cylinder inlet 51 through which the burned high-temperature and high-pressure air passes is provided. The striking cylinder inlet 51 is an example of the striking mechanism inlet, and is configured to have a circular opening on the axis of the driver 20 and the piston 21 in the axial direction of the striking cylinder 2.

  In the combustion chamber 3, a valve support 5 is provided around the blow cylinder inlet 51, and a ring-shaped space is formed around the valve support 5.

  The head valve 4 is an example of a valve body and is formed of a cylindrical metal member. As shown in FIGS. 2 and 3, the head valve 4 is closed at the lower end surface along the axial direction of the cylinder to form a circular and flat valve surface 40. In the head valve 4, the diameter of the valve surface 40 is larger than that of the striking cylinder inlet 51, and the striking cylinder inlet 51 is closed when the valve surface 40 is in contact with the partition 50.

  The head valve 4 includes a first seal portion 41 and a second seal portion 42. The first seal portion 41 is an example of the seal 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 seal member 41 a is attached. The first sealing material 41a is composed of a metal ring called a piston ring. In the first seal portion 41, a groove into which the first seal member 41a fits is formed in the circumferential direction, and when the first seal member 41a is attached, the first seal member 41a protrudes a predetermined amount from the circumferential surface To do. In the present example, two first sealing portions 41 a are attached to the first sealing portion 41 along the axial direction of the head valve 4.

  The second seal portion 42 is an example of a seal portion, and is provided on the outer periphery of the head valve 4 at a predetermined distance from the first seal portion 41 along the axial direction of the head valve 4. 42a is attached. The second seal member 42 a is a so-called O-ring made of an elastic material such as rubber. In the second seal portion 42, a groove into which the second seal material 42a is fitted is formed in the circumferential direction, and when the second seal material 42a is attached, the second seal material 42a protrudes from the circumferential surface by a predetermined amount. To do.

  In the head valve 4, the first seal portion 41 and the second seal portion 42 protrude outward from the circumferential surface of the head valve 4, and the second seal portion 42 is in relation to the first seal portion 41. The diameter is large. The surface of the second seal portion 42 that faces the first seal portion 41 is an operation surface 43 that is pressed by high-temperature and high-pressure gas. The operation surface 43 is a ring-shaped surface.

  The head valve 4 is biased toward the partition 50 by a spring 44. The spring 44 is an example of an urging member, and is configured by a coil spring. The axis of the spring 44 is on the axis of the driver 20 and the piston 21 on the axis of the striking cylinder 2, that is, the head valve 4 and the striking cylinder inlet 51. It is provided on the same axis. The spring 44 enters the recess 45 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. Arranged. Such an arrangement is called an overlap arrangement. Further, in order for the spring 44 to enter the recess 45 of the head valve 4, the spring 44 is smaller in diameter than the head valve 4, and the spring 44 can be smaller in diameter than the striking cylinder 2.

  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 high-temperature and high-pressure gas does not act on the operating surface 43.

  The head valve 4 is movably supported by a valve support 5.

  The valve support 5 is an example of a valve support and is made of a cylindrical metal member. As shown in FIGS. 2 and 3, the valve support 5 is integrally provided with a partition portion 50 at a lower portion along the axial direction of the cylinder in this example. When the head valve 4 is put in the cylindrical inner space, the valve support 5 is in sliding contact with the first seal member 41 a of the first seal portion 41 of the head valve 4 and the second seal portion 42. The second sealing material 42a is in sliding contact. The valve support 5 is provided at each of the seals at a portion where the first seal member 41a of the first seal portion 41 of the head valve 4 is slidably contacted and a portion where the second seal member 42a of the second seal portion 42 is slidably contacted. The inner diameter differs depending on the part.

  When the head valve 4 is inserted into the valve support 5, an operation 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.

  The valve support 5 comprises a head valve inlet 53 connecting the combustion chamber 3 and the working space 52. The head valve inlet 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. The By forming the head valve inlet 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.

  As shown in FIG. 2, the head valve inlet 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 where the striking cylinder inlet 51 is closed by the head valve 4. Then, it connects with the working space 52.

  On the other hand, when the head valve 4 moves upward as shown in FIG. 3 by the action of high temperature and high pressure gas on the working surface 43 of the head valve 4, the striking cylinder inlet 51 opens and the head valve inlet 53 is connected to the striking cylinder inlet 51.

  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 air at normal temperature and pressure, even if the opening area of the head valve inlet 53 is small, an increase in resistance to the gas flow is suppressed.

  The first seal portion 41 is provided with a first seal material 41 a on the outer periphery, and the first seal material 41 a 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.

  The second seal portion 42 is provided with a second seal material 42 a on the outer periphery, and the second seal material 42 a contacts the inner surface of the valve support 5. Since the second seal member 42a is fitted in the groove, the portion exposed to the working space 52 is minimized.

  The valve support 5 comprises a buffer 54 against which the head valve 4 is applied. The shock absorbing material 54 is formed of an elastic member and is provided on the top of the head valve 4. In the valve support 5, the head valve 4 moved by the action of the high-temperature high-pressure gas on the working surface 43 of the head valve 4 hits the buffer material 54, thereby restricting the movement range of the head valve 4. Although the shock absorber 54 restricts the movement range of the head valve 4, when the head valve 4 hits the shock absorber 54, the shock deformation is absorbed by the elastic deformation of the shock absorber 54, so the height of the head valve inlet 53 is It is preferable to set the stroke of the head valve 4 or less. As a result, when the head valve 4 moves to a position where it strikes the shock absorbing 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. Thus, the output can be stabilized by making the opening amount of the head valve inlet 53 constant.

  The upper opening of the combustion chamber 3 is sealed by the head portion 30. The head unit 30 is provided with an ignition device 31. Further, the head unit 30 is provided with a fuel supply port and a compressed air supply port (not shown). Further, the shock absorber 54 is provided in contact with the head portion 30 so that 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 the electrical noise An effect such as reduction of the above can be obtained.

  The nailing machine 1 </ b> A includes a blowback chamber 6 that stores a gas for returning the driver 20 and the piston 21 of the striking cylinder 2. The blowback chamber 6 is provided around the hitting cylinder 2 and is connected to the inside of the hitting cylinder 2 through an inflow / outlet port 60 provided in the vicinity of the cushioning material 22.

  The nailing machine 1 </ b> A includes a contact member 8 in a 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 biased by the spring 80 in a direction protruding 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 the exhaust valve (not shown) is operated in conjunction with the movement of the contact member 8.

<Operation example of the nailing machine of the present embodiment>
Next, the operation of the nailing machine 1A of the present embodiment will be described with reference to the drawings. In the initial state, the operation trigger 16 is not pulled, and the contact member 8 is not pushed by the workpiece, and is in the initial position where it is biased by the spring 80 and protrudes from the nose portion 12.

  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).

  The head valve 4 is pressed by the spring 44 and is in a state where the valve surface 40 is in contact with the partition portion 50, that is, a state where the striking cylinder inlet 51 is closed by the head valve 4. In this state, the head valve inlet 53 communicates with the working space 52.

  When the contact member 8 is pressed against the workpiece, the movement of the contact member 8 is transmitted to the exhaust valve (not shown) by the link 81, and the combustion chamber 3 is sealed.

  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 the vaporized fuel and the compressed air are supplied to the combustion chamber 3.

  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 is increased by the compressed air, the head valve 4 is pressed by the spring 44 and keeps the valve surface 40 in contact with the partition 50, and the striking cylinder inlet 51 is closed by the head valve 4. It is done. Therefore, even if the pressure in the combustion chamber 3 increases due to the supply of compressed air, the pressure does not increase in the striking cylinder 2 and the piston 21 does not operate.

  When the ignition device 31 is activated at a predetermined timing after the contact member 8 is pressed against the workpiece and the operation trigger 16 is operated to open an air valve and a fuel valve (not shown), 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 increases, and high-temperature and high-pressure gas flows into the working space 52 from the head valve inlet 53 of the head support 5.

  When the pressure in the working space 52 is increased, the 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 that faces the working space 52. However, since the working surface 43 has a larger area, the head valve 4 ascends while compressing the spring 44.

  As shown in FIG. 3, when the head valve 4 moves upward, the striking cylinder inlet 51 opens and the head valve inlet 53 communicates with the striking cylinder inlet 51. As a result, high-temperature and high-pressure gas flows from the combustion chamber 3 through the blow cylinder inlet 51 into the blow cylinder 2 and the pressure of the blow cylinder 2 increases.

  When the pressure of the striking cylinder 2 increases, the piston 21 is pushed, the piston 21 and the driver 20 move in the direction of driving out the fastener, and the fastener driving operation is performed. When the piston 21 and the driver 20 move in the direction of driving out 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 / exhaust port 60. Furthermore, since the piston 21 passes through the inflow / outflow port 60 while compressively deforming the buffer member 22, a part of the high temperature / high pressure gas that has driven the piston 21 flows into the blowback chamber 6.

  A high-temperature and high-pressure gas flows from the combustion chamber 3 through the striking cylinder inlet 51 and into the striking cylinder 2, and the pressure in the combustion chamber 3 decreases, 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 50, and the striking cylinder inlet 51 is closed by the head valve 4.

  Further, when the piston 21 and the driver 20 move in the direction of driving out the fastener, and the piston 21 moves to the bottom dead center and hits the buffer material 22, the piston 21 and the driver 20 try to move upward due to the elasticity of the buffer material 22. . When the piston 21 passes through the inlet / outlet port 60 and moves to the upper side of the inlet / outlet port 60, the gas (air) in the blowback chamber 6 whose 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.

  When the contact member 8 is separated from the workpiece, an exhaust valve (not shown) is opened, and the combustion chamber 3 is opened to the atmosphere.

  In the nailing machine 1A according to the present embodiment, compressed air and fuel are supplied to the combustion chamber 3 to generate a high-pressure gas by burning the mixed gas, and the piston 21 of the striking cylinder 2 is pushed with this high-pressure gas. Thus, the force pressing the fastener with the piston 21 and the driver 20 becomes strong.

  Thereby, compared with the conventional gas combustion type nail driver using normal-pressure gas, the output for driving a fastener can be raised.

  In addition, by providing the head valve 4 that opens and closes the blow cylinder inlet 51 between the combustion chamber 3 and the blow cylinder 2, the blow cylinder 2 is not operated 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 unnecessary. Thereby, the structure of the head valve 4 and its drive mechanism can be simplified, and the downsizing and cost reduction of the device can be achieved.

  Furthermore, the combustion chamber 3 is provided at the upper portion 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 where the combustion chamber is provided around the striking cylinder 2. The diameter of the combustion chamber 3 can be reduced without reducing. Since the inside of the combustion chamber 3 is at a high pressure, the combustion chamber 3 needs to have strength. However, since the diameter of the combustion chamber 3 can be reduced, the strength can be ensured even if the combustion chamber 3 is thinned. The entire device can be reduced in size and weight.

  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. As a result, the head valve 4 can be made smaller 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 striking cylinder inlet 51 can be shortened.

  Furthermore, since the gas for operating the head valve 4 is high temperature and high pressure, the viscosity is lower than that in the case of burning normal pressure gas. Thereby, the diameter of the head valve inlet 53 through which the gas for operating the head valve 4 passes can be reduced, and the diameter of the peripheral structure of the combustion chamber 3 and the head valve 4 can be reduced.

  The first seal portion 41 provided in the head valve 4 is provided with a first seal member 41 a on the outer periphery, and the first seal member 41 a 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 flows from the striking cylinder inlet 51 below the head valve 4, but the first sealing material 41a is a groove. The exposed area is minimized because the

  In addition, 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 moves to the head valve flow. In order to pass through the inlet 53, the first seal member 41a is exposed to a high temperature and high pressure gas. However, since the first sealing material 41a is a metal, the first sealing material 41a is suppressed from being affected by heat.

  Further, the second seal portion 42 is provided with a second seal material 42 a on the outer periphery, and the second seal material 42 a is in contact with the inner surface of the valve support 5. Since the second seal member 42a is fitted in the groove, the portion exposed to the working space 52 is minimized.

  Since the high-temperature and high-pressure gas acts on the operating surface 43 of the head valve 4, even when the head valve 4 opens the head valve inlet 53, the exposure of the second sealing material 42 a is suppressed. It is suppressed that the sealing material 42a receives the influence of heat. Further, since the second seal portion 42 does not pass through the head valve inlet 53 when the head valve 4 opens the head valve inlet 53, the second sealing material 42a is prevented from being exposed to high-temperature and high-pressure gas. Is done.

  Therefore, the durability of the sealing material is improved, and desired performance can be maintained for long-term use. In addition, since one seal member (first seal member 41a) of the head valve 4 is made of metal, the friction with the valve support 5 is reduced, and along with the reduction in diameter of the head valve 4, the head valve The moving speed of 4 can be improved. Furthermore, even when the head valve 4 is configured such that the seal material is disposed on the end face along the moving direction of the head valve 4 by using the seal material made of metal and exposed to the gas flow path The durability of the seal part can be somewhat improved.

  However, when a sealing material made of metal is used, a higher contact pressure is required than when a sealing material made of an elastic material such as rubber is used, and therefore the use of a high-load spring is essential. Therefore, in the nailing machine 1A according to the present embodiment, the spring 44 is arranged on the same axis as the center of the head valve 4, so that the main body 10 is not increased in size and the high-load spring can be obtained. It can be used. Furthermore, by forming the recess 45 in the axial direction of the head valve 4 and arranging so as to overlap so that the spring 44 can be inserted, the amount by which the spring 44 protrudes from the head valve 4 can be reduced. It can suppress that a dimension becomes large. Further, since the spring 44 is inserted into the recess 45 of the head valve 4, the diameter of the spring 44 can be smaller than that of the striking cylinder 2, and an increase in the radial dimension of the main body 10 can be suppressed.

  DESCRIPTION OF SYMBOLS 1A ... Nailing machine, 10 ... Main-body part, 11 ... Handle part, 12 ... Nose part, 13 ... Tank attaching part, 14 ... Magazine, 15 ... Air plug, 16 ... Operation trigger, 17 ... Battery, 18 ... Battery mounting part, 2 ... Impact cylinder (impact mechanism), 20 ... Driver, 21 ... Piston, 22 ... Buffer material, DESCRIPTION OF SYMBOLS 3 ... combustion chamber, 30 ... head part, 31 ... igniter, 4 ... head valve (valve body), 40 ... valve surface, 41 ... 1st seal part, 41a ... 1st sealing material, 42 ... 2nd sealing part, 42a ... 2nd sealing material, 43 ... working surface, 44 ... spring, 45 ... recessed part, 5 ..Valve support (valve support), 50... Partitioning part, 51. , 52: working space, 53: head valve inlet, 54: shock absorber, 6: blowback chamber, 60: inlet and outlet, 8: contact member, 80.・ Spring, 81 ... Link

Claims (9)

A striking mechanism that operates with a combustion pressure of a mixed gas of compressed air and fuel;
A combustion chamber for burning a gas mixture of compressed air and fuel;
A valve body that opens and closes between the striking mechanism and the combustion chamber;
A valve support for supporting the valve body;
The said valve body is a driving tool provided with the seal part in the outer peripheral surface along a moving direction. The combustion chamber is provided in the axial direction of the striking mechanism,
The driving tool according to claim 1, further comprising: the valve support body in sliding contact with the seal portion of the valve body in the combustion chamber. The driving tool according to claim 1, wherein the seal portion includes a metal seal material in sliding contact with the valve support. The partition part separating the striking mechanism and the combustion chamber is provided with a striking mechanism inlet for introducing a gas from the combustion chamber to the striking mechanism,
The driving tool according to any one of claims 1 to 3, wherein the striking mechanism inlet is configured such that an opening having a diameter smaller than that of the striking mechanism is provided in the axial direction of the striking mechanism. The driving tool according to any one of claims 1 to 4, wherein a biasing member for biasing the valve body is provided on an axis of the striking mechanism. A striking mechanism that operates with a combustion pressure of a mixed gas of compressed air and fuel;
A combustion chamber for burning a gas mixture of compressed air and fuel;
A valve body that opens and closes between the striking mechanism and the combustion chamber;
A valve support for supporting the valve body;
A driving tool comprising a biasing member for biasing the valve body on an axis of the striking mechanism. The driving tool according to claim 5 or 6, wherein the biasing member enters a recess formed in the valve body along a moving direction of the valve body. The driving tool according to any one of claims 5 to 7, wherein the biasing member has a smaller diameter than the striking mechanism. The driving tool according to any one of claims 1 to 8, wherein the valve support is smaller in diameter than the striking mechanism and is provided inside the combustion chamber along an axial direction of the striking mechanism.

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