JP2011000689A - Combustion type power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion type power tool which shortens a moving distance of a push lever, releases the sealed state of a combustion chamber by largely opening the combustion chamber, and is excellent in durability.SOLUTION: The combustion type power tool is provided with a gear mechanism 40 between a push lever 9 and a combustion chamber frame, and also between a first and second housings 2A and 2B. A combustion chamber frame side rack 43 of the gear mechanism 40 is engaged with a first gear 41. A second gear 42 is provided with a second small diameter gear 42A having a smaller diameter than the second gear 42, and integrally and coaxially connected to the secure gear 42 so as to be rotatable, and the second gear 42 is engaged with the first gear 41. The second small diameter gear 42A is engaged with the push lever side rack 44. An arm abutting part 44A of the push lever side rack 44 is movable integrally with the push lever 9. A combustion chamber frame abutting part 43A of the combustion chamber frame side rack 43 is movable integrally with the combustion chamber frame.

Description

  The present invention relates to a combustion power tool.

  Conventionally, a combustion power tool such as a combustion type driving tool for driving a nail or the like has a configuration in which a mixed gas containing fuel injected into a combustion chamber is burned and the volume expansion of the mixed gas is converted into power. More known. The combustion type power tool having such a configuration includes a housing, a cylinder, and a piston. The housing has one end and the other end, and the cylinder is fixedly provided in the housing in a positional relationship in which the axial center is oriented in a direction connecting the one end and the other end of the housing.

  In the cylinder, a piston is provided that can slide back and forth with respect to the cylinder in the axial direction of the cylinder. The piston divides the cylinder into an in-cylinder piston upper chamber near one end of the housing and a piston lower chamber near the other end of the housing, and a driver blade extends from the piston toward the other end of the housing. The driver blade and the piston are configured to slide together. The cylinder has an exhaust hole that can communicate with the atmosphere. A check valve is provided in the exhaust hole. In addition, a substantially cylindrical chamber is coaxially mounted on the cylinder, and the chamber can slide in the axial direction of the cylinder with respect to the outer peripheral surface of the cylinder. A combustion chamber is defined by a piston, a cylinder, a chamber, and the like.

  As a safety device, a push lever is provided at the other end of the housing so as to project from the other end of the housing so as to be interlocked with the chamber. When the nail is driven, the push lever is pressed against the workpiece to move in the axial direction of the cylinder, the safety device is released, and the chamber is moved to define the combustion chamber Has been.

  When driving the nail, the push lever is pressed against the work piece to move in the axial direction of the cylinder, the safety device is released, and the chamber moves to define the combustion chamber. The liquefied gas is injected and mixed with air to form an air-fuel mixture that is explosively burned. As a result, the piston is integrated with the driver blade and slides from one end of the housing toward the other end, and the driver blade drives the nail into a workpiece such as wood. At this time, the check valve is in an open state, and the exhaust gas generated by the explosion combustion from the exhaust hole is discharged into the atmosphere.

  After explosion combustion of liquefied gas in the piston upper chamber, the check valve is closed and the combustion chamber is sealed. Thus, a thermal vacuum is obtained in the piston upper chamber due to a pressure drop in the combustion chamber due to a temperature drop in the piston upper chamber. The pressure in the lower piston chamber is higher than that in the upper piston chamber, and the piston is returned to the initial top dead center position. When the bush lever is not pressed, the sealed state of the combustion chamber is released, air flows into the combustion chamber, and ventilation in the combustion chamber is performed.

  The smaller the amount of movement of the push lever, the shorter the distance from the other end of the combustion-type power tool to the workpiece, so that it is easier to aim the nail. Therefore, in Japanese Patent Application Laid-Open No. 2006-218619 (Patent Document 1), the amount of movement of the combustion chamber sleeve corresponding to the chamber is greater than the amount of movement of the nose corresponding to the push lever using a rope and a turning wheel. A growing technology is disclosed. Japanese Patent Laid-Open No. 2006-110718 (Patent Document 2) uses a lever arm to increase the amount of movement of the movable inner wall corresponding to the chamber rather than the amount of movement of the pressing means corresponding to the push lever. It is disclosed.

JP 2006-218619 A JP 2006-110718 A

  However, in the above-described conventional combustion power tool, there has been a problem that the rope is easily caught or cut by other members in the housing, and the lever arm is easily damaged.

  Therefore, the present invention provides a combustion type power tool that can shorten the moving distance of the push lever, can open the combustion chamber widely to release the sealed state of the combustion chamber, and has excellent durability. For the purpose.

  In order to achieve the above object, the present invention provides a housing having one end and the other end, a head portion provided in the vicinity of one end of the housing, and a direction in which an axis connects the one end and the other end of the housing. A cylinder which is fixedly provided in the housing in an oriented positional relationship and is formed with an exhaust hole capable of communicating with the atmosphere; a push lever which is provided at the other end of the housing and is movable when pressed against a workpiece; The cylinder is reciprocally slidable relative to the cylinder in the axial direction, the piston defines the cylinder as a piston lower chamber and a piston upper chamber in the cylinder, and is movably guided in the housing. The push lever and the combustion chamber frame having a combustion chamber frame that contacts and separates from the head portion in conjunction with the movement of the push lever and defines a combustion chamber together with the head portion, the piston, and the cylinder. Between Is a combustion type provided with a gear mechanism or an insulator mechanism for interlocking the push lever and the combustion chamber frame so that the movement amount of the combustion chamber frame is larger than the movement amount of the push lever. Provides power tools.

  Between the push lever and the combustion chamber frame, there is a gear mechanism or a lever mechanism for interlocking the push lever and the combustion chamber frame so that the movement amount of the combustion chamber frame is larger than the movement amount of the push lever. Since it is provided, the moving distance of the push lever can be shortened and the moving distance of the combustion chamber frame can be increased. For this reason, it is possible to easily perform aiming of a nail or the like with a combustion type power tool, and it is possible to increase the opening / closing amount of the combustion chamber and efficiently perform air suction and scavenging after combustion.

  Here, the gear mechanism preferably has at least two gears. Since the gear mechanism has at least two gears, the gear mechanism can be configured with a relatively simple configuration.

  A combustion chamber frame side rack movable integrally with the combustion chamber frame meshes with one gear of the two gears, and the other gear of the two gears is integrated with the other gear coaxially. It is preferable that the other rotatable second gear is connected, and the other second gear is engaged with a push lever side rack movable integrally with the push lever.

  One gear of the two gears meshes with a combustion chamber frame side rack that can move integrally with the combustion chamber frame, and the other gear of the two gears has the other first gear that can rotate coaxially with the other gear. 2 gears are connected, and the other second gear is engaged with a push lever side rack that can move integrally with the push lever, so that the diameter of the other gear and the diameter of the other second gear are By determining the relationship, the relationship between the movement amount of the push lever and the movement amount of the combustion chamber frame can be easily determined.

  The housing has the one end and the other end and intersects a direction connecting the head portion, the piston, the cylinder, and the power storage portion that houses the combustion chamber frame, and the one end and the other end. It is possible to divide at least into a handle support portion having a handle portion extending in the direction of movement, and the gear mechanism is preferably disposed between the power storage portion and the handle support portion.

  The housing has one end and the other end, a power storage portion that houses the head portion, the piston, the cylinder, and the combustion chamber frame, and a handle portion that extends in a direction intersecting the direction connecting the one end and the other end. Since the gear mechanism is disposed between the power storage portion and the handle support portion, the power storage portion can be handled as a state where the gear mechanism is disposed on the surface of the handle support portion. By fixing to the support portion, the housing can be configured, and at the same time, the gear mechanism can be disposed in the housing and between the push lever and the combustion chamber frame. For this reason, in order to assemble and arrange the gear mechanism in the housing, it is not necessary to provide a separate pin or the like, and it is possible to provide a combustion type power tool in which the manufacturing cost is reduced.

  As described above, the present invention provides a combustion-type power tool that can shorten the moving distance of the push lever, can open the combustion chamber widely to release the sealed state of the combustion chamber, and has excellent durability. be able to.

Sectional drawing which shows the combustion type power tool by embodiment of this invention. The disassembled perspective view which shows the combustion type power tool by embodiment of this invention. It is the schematic which shows operation | movement of the gear mechanism of the combustion type power tool by embodiment of this invention, (a) is a figure which shows the state which the push lever is not pressed, (b) is the state where the push lever was pressed FIG. It is the schematic which shows operation | movement of the lever mechanism of the modification of the combustion type power tool by embodiment of this invention, (a) is a figure which shows the state by which the push lever is not pressed, (b) is a push lever pressing The figure which shows the state made.

  An embodiment in which a combustion type power tool is applied to a combustion type driving tool will be described with reference to FIGS. 1 to 3. The combustion type driving tool 1 shown in the sectional view of FIG. 1 has a housing 2 composed of a first housing 2A and a second housing 2B. For convenience of explanation, the upper end of the first housing 2A shown in FIGS. 1 and 2 is one end of the housing 2, and the lower end of the first housing 2A is the other end of the housing 2. The first housing 2A and the second housing 2B constitute a housing 2 that forms the entire outer shell of the combustion type driving tool 1. That is, the housing 2 is configured to be divided into two as shown in FIG. 2, and when the left side of FIG. 1 is directed vertically upward and the right side of FIG. The first housing 2A can be removed vertically upward with respect to the second housing 2B.

  A head cover 3 having an air inlet 3a is attached to the upper portion of the first housing 2A. The second housing 2 </ b> B has a handle 4 that extends in a direction intersecting the direction connecting the one end and the other end of the housing 2. The handle 4 has an outer shell formed by the second housing 2B. The first housing 2A corresponds to a power storage portion, and the second housing 2B corresponds to a handle support portion. The handle 4 corresponds to a handle portion.

  The handle 4 includes a trigger switch 5 and a battery 4A is detachably inserted. A cylinder chamber 29 is formed in a portion of the second housing 2B facing the first housing 2A, and a gas cylinder 30 containing a combustible liquefied gas is detachably accommodated in the cylinder chamber 29. The gas cylinder 30 is provided with an injection rod 30A. A magazine 6 loaded with nails (not shown) is provided below the handle 4.

  From the vicinity of the lower end of the first housing 2A, a nose 7 is integrally formed with a cylinder 20 which will be described later, and a tip portion of the nose 7 faces a workpiece (not shown). The nose 7 guides sliding of a driver blade 23A described later and driving of a nail (not shown) into a workpiece (not shown). On the lower end 7a of the nose 7, a push lever 9 that abuts on a workpiece (not shown) is supported so as to protrude in a reciprocating manner. The upper end of the push lever 9 is connected to the lower end of the push lever arm 9B shown in FIG. 3 by an adjuster 9A. The upper end of the push lever arm 9B shown in FIG. 3 is connected to a combustion chamber frame 10 described later via a gear mechanism 40 described later.

  A head cap 11 serving as a head portion for covering the upper end opening is fixed to the upper end of the first housing 2A. As shown in FIG. 1, a motor 18 is disposed on the upper side of the head cap 11 opposite to a combustion chamber 26 described later, and an ignition position faces the inside of the combustion chamber 26 in the vicinity of the motor 18. A spark plug (not shown) is provided.

  Further, in the first housing 2A, there is provided a head switch (not shown) for detecting that the combustion type driving tool 1 is pressed against a workpiece (not shown) and a combustion chamber frame 10 described later is at the upper end of the stroke. ing. When the push lever 9 is raised to a predetermined position, a head switch (not shown) is turned on, and the rotation of the motor 18 is started.

  A fuel passage 25 is formed in the handle 4 side of the head cap 11, one end of the fuel passage 25 opens to the lower end surface of the head cap 11, and the other end side is a gas cylinder connecting portion connected to the injection rod 30 </ b> A of the gas cylinder 30. 25A is formed.

  A substantially cylindrical combustion chamber frame 10 (chamber) that can move in the longitudinal direction of the first housing 2 </ b> A and whose upper end can contact the lower end surface of the head cap 11 is provided in the first housing 2 </ b> A. The combustion chamber frame 10 is configured to move with the movement of the push lever 9.

  A gear mechanism 40 is provided between the push lever 9 and the combustion chamber frame 10 and between the first housing 2A and the second housing 2B. As shown in FIG. 2, the gear mechanism 40 includes a first gear 41, a second gear 42, a combustion chamber frame side rack 43, and a push lever side rack 44, and the combustion chamber frame side rack 43. Has a combustion chamber frame abutting portion 43A extending in a direction orthogonal to the vertical direction. The combustion chamber frame contact portion 43A is inserted into the first housing 2A through a through hole 2b (FIG. 1) formed in the first housing 2A. As shown in FIG. The frame 10 is in contact with the lower end shown in FIG. Further, the combustion chamber frame side rack 43 is provided with a guide 43B protruding in the direction of the second housing 2B as shown in FIG.

  The combustion chamber frame side rack 43 meshes with the first gear 41. The second gear 42 is provided with a second small gear 42A having a smaller diameter than the second gear 42 so as to be coaxially and integrally rotatable with the second gear 42. The second gear 42 is provided with the first gear 41. Is engaged. The second small diameter gear 42 </ b> A meshes with the push lever side rack 44. The lower end portion of the push lever side rack 44 has an arm contact portion 44 </ b> A that extends in a direction orthogonal to the vertical direction and further extends in a direction approaching the other end of the housing 2. The arm contact portion 44A is inserted into the first housing 2A through a through hole 2c formed in the first housing 2A, and contacts the upper end portion of the push lever arm 9B (FIG. 3) in the first housing 2A. . The first gear 41 corresponds to one gear, the second gear 42 corresponds to the other gear, and the second small-diameter gear 42A corresponds to the other second gear. Further, the push lever side rack 44 is provided with a guide 44B protruding in the direction of the second housing 2B as shown in FIG.

  Guide grooves 2d and 2e extending in parallel to the direction connecting the one end and the other end of the housing 2 are formed in the portion of the second housing 2B facing the guides 43B and 44B, respectively. Guides 43B and 44B are always engaged with the guide grooves 2d and 2e, respectively, and the guides 43B and 44B can slide in the guide grooves 2d and 2e, respectively. In addition, through holes 41a and 42a are formed at the axial position of the first gear 41 and the axial positions of the second gear 42 and the second small-diameter gear 42A, respectively, and are opposed to the through holes 41a and 42a. The second housing 2B is provided with shaft portions 2C and 2D extending in the direction of the first housing 2A. The shaft portions 2C and 2D pass through the through-hole 41a of the first gear 41, the second gear 42, and the through-hole 42a of the second small-diameter gear 42A, respectively. As shown in FIG. When the two housings 2B are mounted, the extending ends of the shaft portions 2C and 2D are configured to abut on the surface of the first housing 2A facing the second housing 2B.

  A cylinder 20 that guides the movement of the combustion chamber frame 10 is fixed to the first housing 2 </ b> A so as to contact the inner peripheral surface of the combustion chamber frame 10. An exhaust hole 21 communicating with the atmosphere is formed in the vicinity of the substantially central portion in the axial direction of the cylinder 20. Since the exhaust hole 21 communicating with the atmosphere is formed in the cylinder 20, the combustible gas is explosively burned in the combustion chamber 26 as will be described later, and the piston 23 moves from one end toward the other end of the first housing 2A. When sliding, a gas in a piston lower chamber 20b (FIG. 1) described later can be discharged from the exhaust hole 21 to the atmosphere through an exhaust port (not shown). For this reason, it can prevent that the gas in piston lower chamber 20b acts like an air damper, and obstructs sliding of piston 23. Further, the exhaust gas of the combustible gas explosively burned in the combustion chamber 26 can be exhausted to the atmosphere through the exhaust hole 21 and an exhaust port (not shown).

  As shown in FIG. 1, a piston 23 that can reciprocate with respect to the cylinder 20 is provided in the cylinder 20, and the piston 23 is divided into a piston upper chamber 20 a and a piston lower chamber 20 b. To do. The driver blade 23A extends from the lower surface of the piston 23 to the position of the nose 7, and the tip of the driver blade 23A forms a location where a nail (not shown) is struck.

  Further, a bumper 24 made of an elastic body is disposed at the lowermost part in the cylinder 20. Therefore, when the piston 23 moves downward, it collides with the bumper 24 at the bottom dead center. A through hole 24a is formed in the bumper 24, and the driver blade 23A passes through the through hole 24a.

  When the upper end of the combustion chamber frame 10 contacts the head cap 11, the combustion chamber 26 is defined by the head cap 11, the combustion chamber frame 10, and the piston 23. When the combustion chamber frame 10 is separated from the head cap 11, a first flow path 26 a communicating with the outside air is generated between the head cap 11 and the upper end of the combustion chamber frame 10, and the upper end portion of the combustion chamber frame 10 and the cylinder 20 are formed. The second flow path 26b is formed between the upper end of each of the two. These flow passages allow combustion gas and new air to pass through the outer peripheral surface side of the cylinder 20, and the passed combustion gas and the like are discharged from an exhaust port (not shown) formed in the first housing 2 </ b> A. Further, air is supplied into the combustion chamber 26 from the intake port 3a of the head cover 3 described above, and the combustion gas in the combustion chamber 26 is discharged from the exhaust hole 21 in the same manner as an exhaust port (not shown). .

  A fan 19 is disposed in the combustion chamber 26. The fan 19 is fixed to the output shaft 18b of the motor 18, and can rotate integrally with the output shaft 18b. When the combustion chamber frame 10 is in a position where it comes into contact with the head cap 11, the fan 19 rotates to agitate and mix air and combustible gas. In addition, turbulent combustion is generated after ignition to promote combustion. When the combustion chamber frame 10 is separated from the head cap 11 and the first flow path 26a and the second flow path 26b are generated, the combustion gas in the combustion chamber 26 is scavenged and the cylinder 20 is cooled. Fulfills the function.

  Next, a process of mounting the gear mechanism 40 on the housing 2 of the combustion type driving tool 1 will be described. First, as shown in FIG. 2, the first housing 2 </ b> A is removed from the second housing 2 </ b> B, and the left side in FIG. 2 is vertically upward and the right side is vertically downward. In this state, the following mounting of the housing 2 to the gear mechanism 40 is performed. Next, the shaft portions 2C and 2D of the second housing 2B pass through the through hole 41a of the first gear 41, the second gear 42 and the through hole 42a of the second small diameter gear 42A, and the combustion chamber frame side. The guide 43B of the rack 43 and the guide 44B of the push lever side rack 44 are engaged with the guide grooves 2d and 2e, respectively. Thus, the combustion chamber frame side rack 43 is engaged with the first gear 41, the second gear 42 is engaged with the first gear 41, and the second small diameter gear 42A is engaged with the push lever side rack 44. Then, the first housing 2A is mounted on the second housing 2B, and the first housing 2A is fixed to the second housing 2B. Thus, the gear mechanism 40 is mounted on the housing 2 of the combustion type driving tool 1.

  Next, the operation of the combustion type driving tool 1 will be described. In the non-actuated state, the push lever 9 protrudes from the lower end of the nose 7 as shown in FIG. At this time, since the combustion chamber frame 10 is interlocked with the push lever 9, the upper end of the combustion chamber frame 10 is separated from the head cap 11. Further, the inner peripheral surface of the combustion chamber frame 10 is in a state of being separated from the upper end portion of the cylinder 20. Thus, the first flow path 26a and the second flow path 26b are provided. At this time, the piston 23 is stopped at the top dead center position in the cylinder 20.

  When the handle 4 is gripped in this state and the push lever 9 is pressed against a workpiece (not shown), the push lever 9 approaches the cylinder 20 relatively, and the combustion chamber frame 10 connected to the push lever 9 also moves against the cylinder 20. The first flow path 26a and the second flow path 26b described above are closed, and the combustion chamber 26 is sealed.

  At this time, due to the difference in diameter between the second small-diameter gear 42A and the second gear 42 of the gear mechanism 40, a difference occurs between the movement amount of the push lever side rack 44 and the movement amount of the combustion chamber frame side rack 43, As shown in FIG. 3B, the movement amount D2 of the combustion chamber frame 10 is larger than the movement amount D1 that the push lever 9 moves toward the cylinder 20 and approaches. Therefore, in a non-operating state, the push lever 9 slightly protrudes from the lower end of the nose 7, but the combustion chamber frame 10 is greatly moved and greatly opened only by moving the slight amount of the push lever 9. The combustion chamber that was in the state is sealed.

  Further, as the push lever 9 moves, the gas cylinder 30 is inclined toward the head cap 11, whereby the injection rod 30 </ b> A of the gas cylinder 30 is pressed against the gas cylinder connection portion 25 </ b> A of the head cap 11, and the liquefied gas in the gas cylinder 30 is fueled It is injected only once into the combustion chamber 26 from the injection port of the passage 25.

  Further, when the combustion chamber frame 10 rises to the stroke end as the push lever 9 moves, a head switch (not shown) is turned on to supply electric power to the motor 18 and the fan 19 starts to rotate. As the fan 19 rotates in the combustion chamber 26 that is a sealed space, the injected combustible gas is stirred and mixed with the air in the combustion chamber 26.

  When the trigger switch 5 of the handle 4 is turned on in this state, a spark plug (not shown) sparks, ignites the mixed gas, and burns and expands. The combustion / expanded mixed gas moves the piston 23 downward, and the nail (not shown) in the nose 7 is driven into the workpiece (not shown) by the driver blade 23A until the piston 23 collides with the bumper 24 in the cylinder 20. It is.

  After the driving, the piston 23 comes into contact with the bumper 24, and the combustion gas is discharged from the exhaust hole 21 to the outside of the cylinder 20. Thereafter, the piston 23 is slid in the cylinder 20 in the direction from the other end to the one end of the first housing 2A, and quickly returned to the initial top dead center position.

  Thereafter, the trigger switch 5 is turned off, the combustion type driving tool 1 is lifted, and the push lever 9 and the combustion chamber frame 10 return downward relative to the cylinder 20 when the push lever 9 is separated from the workpiece (not shown). . At this time, the fan 19 continues to rotate for a predetermined time by a control unit (not shown) even if the trigger switch 5 is turned OFF. In the state shown in FIG. 1, the first flow path 26 a and the second flow path 26 b are formed above the combustion chamber frame 10, and the flow is generated by the fan 19, so that clean air is drawn from the intake port 3 a provided in the head cover 3. The air in the combustion chamber 26 is scavenged by taking in and discharging the air after combustion from an exhaust port (not shown). Thereafter, the fan 19 stops and enters an initial stationary state. After the stationary state, the nail can be driven again by repeating the above process again.

  Since a gear mechanism 40 for interlocking the push lever 9 and the combustion chamber frame 10 is provided between the push lever 9 and the combustion chamber frame 10, as shown in FIG. The moving distance D1 can be shortened and the moving distance D2 of the combustion chamber frame 10 can be increased. For this reason, it is possible to easily perform aiming of a nail or the like with a combustion type power tool, and it is possible to increase the opening / closing amount of the combustion chamber and efficiently perform air suction and scavenging after combustion.

  Moreover, since the gear mechanism 40 has two gears, the gear mechanism 40 can be configured with a relatively simple configuration. A combustion chamber frame-side rack 43 that can move integrally with the combustion chamber frame 10 meshes with the first gear 41, and a second small-diameter gear 42A that can rotate integrally with the second gear is connected to the second gear. Since the push lever side rack 44 that can move integrally with the push lever 9 is engaged with the second small diameter gear 42A, the relationship between the diameter of the second gear 42 and the diameter of the second small diameter gear 42A is determined. Thus, the relationship between the movement amount of the push lever 9 and the movement amount of the combustion chamber frame 10 can be easily determined.

  Since the housing 2 can be divided into a power storage portion and a handle support portion, and the gear mechanism 40 is disposed between the power storage portion and the handle support portion, the gear mechanism 40 is disposed on the surface of the handle support portion. By fixing the power storage portion to the handle support portion in the state of being made, the housing 2 is configured, and at the same time, the gear mechanism 40 is disposed in the housing 2 between the push lever 9 and the combustion chamber frame 10. it can. For this reason, in order to assemble and arrange the gear mechanism 40 in the housing 2, it is not necessary to provide a separate pin or the like, and it is possible to provide a combustion type power tool with a reduced manufacturing cost.

  The combustion power tool according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, although the gear mechanism 40 is used in the present embodiment, a lever mechanism may be used instead of the gear mechanism 40. More specifically, as shown in FIG. 4, the lever mechanism 140 is a member having the same outer shape as the push lever side rack 44 and is not provided with a portion that meshes with the gear. And a combustion chamber frame side moving portion 143 which is a member having the same outer shape as the combustion chamber frame side rack 43 and is not provided with a portion meshing with the gear, two insulator members 141 and 142, and an insulator connecting member 145 And have.

  As shown in FIG. 4, the insulator connecting member 145 is configured by a member extending in a direction connecting one end and the other end of the housing, and a convex portion 145A projects from the lower end shown in FIG. A protrusion 145B protrudes from the upper end shown in FIG. The pivot axes of the lever members 141 and 142 are positioned between one end and the other end in the longitudinal direction of the lever members 141 and 142, respectively, and are located on the left side in FIG. 4 near the push lever side moving portion 144. Yes. A through hole is formed in one end portion of the lever member 142, and a convex portion 144B protruding from the push lever side moving portion 144 is engaged with the through hole, and the lever member 142 is in contact with the push lever side moving portion 144. It can be rotated. A through hole is formed in the other end portion of the lever member 142, and the convex portion 145 </ b> A of the lever connecting member 145 is engaged with the through hole, and the lever member 142 is rotatable with respect to the lever connecting member 145. . The lever connecting member 145 is movable in the vertical direction in FIG. 4, which is a direction connecting one end and the other end of the housing 2. A through hole is formed at one end of the lever member 141, and the convex portion 145 </ b> B of the lever connecting member 145 is engaged with the through hole, and the lever member 141 is rotatable with respect to the lever connecting member 145. A through hole is formed in the other end portion of the insulator member 141, and a convex portion 143 </ b> B protruding from the combustion chamber frame side moving portion 143 is engaged with the through hole, and the insulator member 141 is in the combustion chamber frame side moving portion 143. It is possible to rotate with respect to.

  With the above configuration, when the push lever 9 and the push lever side moving portion 144 are pushed upward in FIG. 4, the lever member 142 rotates about its rotation axis, and the lever connecting member 145 is moved downward in FIG. 4. The push lever side moving unit 144 is pushed down by a moving amount larger than the moving amount D1. Then, the lever member 141 rotates about its rotation axis, and the combustion chamber frame side moving part 143 and the combustion chamber frame 10 are moved upward in FIG. 4 by a movement amount D2 larger than the movement amount of the lever connecting member 145. Push up.

  Further, the housing 2 can be divided into two, but it may be divided into two or more.

  The combustion-type power tool of the present invention is particularly useful in the field of combustion-type power tools that require more precise aiming such as nails.

DESCRIPTION OF SYMBOLS 1 ... Combustion type driving tool 2 ... Housing 2A ... 1st housing 2B ... 2nd housing 4 ... Handle 10 ... Combustion chamber frame 20 ... Cylinder 40 ... Gear mechanism 41 ... 1st gear 42 ... 2nd gear 42A ... 2nd small diameter gear lever mechanism ... 140

Claims (4)

A housing having one end and the other end;
A head portion provided near one end of the housing;
A cylinder in which an axial center is fixedly provided in the housing in a positional relationship oriented in a direction connecting one end and the other end of the housing, and an exhaust hole capable of communicating with the atmosphere is formed;
A push lever provided at the other end of the housing and movable when pressed against the workpiece;
A piston capable of reciprocating relative to the cylinder in the axial direction of the cylinder, and defining the cylinder into a piston lower chamber and a piston upper chamber in the cylinder;
A combustion chamber frame guided in a movable manner in the housing, contacting and separating from the head portion in conjunction with the movement of the push lever, and defining a combustion chamber together with the head portion, the piston and the cylinder; Have
Between the push lever and the combustion chamber frame, the push lever and the combustion chamber frame are interlocked so that the movement amount of the combustion chamber frame is larger than the movement amount of the push lever. A combustion-type power tool provided with a gear mechanism or a lever mechanism.   The combustion power tool according to claim 1, wherein the gear mechanism has at least two gears.   One gear of the two gears meshes with a combustion chamber frame side rack movable integrally with the combustion chamber frame, and the other gear of the two gears can rotate integrally with the other gear coaxially. The combustion type according to claim 2, wherein the other second gear is connected, and a push lever side rack movable integrally with the push lever is engaged with the other second gear. Power tool. The housing has the one end and the other end, and intersects a direction connecting the head portion, the piston, the cylinder, and the power storage portion that houses the combustion chamber frame, and the one end and the other end. A handle support portion having a handle portion extending to
The combustion type power tool according to claim 1, wherein the gear mechanism is disposed between the power storage portion and the handle support portion.

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