JP5556496B2 - Gas fired driving tool - Google Patents

Description

  In the present invention, a piston is dynamically driven by the pressure of combustion gas generated by burning combustible gas, and a nail or a pin is driven into a work material such as concrete or wood by a driver integrally coupled to the piston. The present invention relates to a gas-fired driving tool.

  High pressure combustion gas pressure generated in the combustion chamber by injecting combustible gas into the sealed combustion chamber to generate a mixed gas of combustible gas and air in the combustion chamber, igniting this mixed gas and burning in the combustion chamber The gas combustion is made to act on the piston slidably accommodated in the cylinder to drive the piston shockably in the cylinder and to drive the nail into the steel plate or concrete by the driver coupled to the piston. A type driving tool is known. In such a gas combustion type driving tool, a nose having an injection port for driving and guiding a nail toward a driven material is coupled below a housing that houses a cylinder, and a driver coupled to a piston. Is accommodated and guided in the injection port. A magazine containing a large number of nails is connected to the rear side of the nose, and the nail supplied from the magazine to the injection port of the nose is transferred from the injection port to the workpiece to be placed at the tip of the nose by the driver. It is designed to be launched.

  In the gas combustion type driving tool driven by the combustion gas, a contact member supported so as to be slidable along the injection port is provided on the outer peripheral surface of the nose forming the injection port of the nail. The upper end of the member is linked to a movable sleeve that forms a combustion chamber via a guide rod, and when the contact member is operated upward, the movable sleeve is moved upward to seal the combustion chamber. The combustible gas is introduced into the combustion chamber to generate a mixed gas in the combustion chamber. Then, by operating a trigger provided so that it can be operated by a hand holding the nail driver, the mixed gas in the combustion chamber is ignited to start the nail driver. Thus, the contact member constitutes a safety device that operates so that the tool cannot be activated unless the contact member is operated by bringing the injection port of the nailing machine into contact with the material to be driven (see Patent Document 1).

JP 2005-254399 A

  However, since the conventional gas combustion type driving tool described above has a contact member and a combustion chamber (movable sleeve) connected to each other, components such as grips, magazines and noses are disassembled in order to remove the combustion chamber during maintenance. Therefore, there is a problem that the removal of the combustion chamber is not easy.

  Then, this invention makes it a subject to provide the gas combustion type driving tool which can remove a combustion chamber easily.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.

That is, the gas combustion type driving tool according to claim 1 includes a cylinder disposed in a housing, a cylinder head provided above the cylinder, and a combustion chamber disposed so as to be slidable with respect to the cylinder. A movable sleeve that forms an injection port below the cylinder, and is arranged so as to protrude in the distal direction of the nose portion, and is pushed into the interior when pressed against the material to be driven, and the movable sleeve A contact member for sealing the combustion chamber by sliding, and the movable sleeve is provided so as to be separable from the contact member, and from above the cylinder when the cylinder head is removed. are removably formed, the movable sleeve, the arm is rotatably mounted in a position facing the side, via the arm Characterized in that it is supported by the contact member Te.

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.

That is, the movable sleeve is formed to be slidable along the longitudinal direction of the cylinder, and when the contact member is pushed to the maximum and slides in the direction of the cylinder head, the cylinder head It is characterized by having a gap between the two.

(Claim 3)
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 1 or 2.

That is, the arm is a metal wire .

(Claim 4)
The invention described in claim 4 is characterized by the following points in addition to the characteristics of the invention described in claim 3 described above.

That is, a guide block is provided between the contact member and the arm .

The invention according to claim 1 is as described above, and the movable sleeve is provided so as to be separable from the contact member, and is formed to be removable from above when the cylinder head is removed. The movable sleeve that forms the combustion chamber can be easily removed without disassembling components such as the nose.
Further, since the movable sleeve is supported by the contact member via a pivotable arm, the arm can connect the movable sleeve and the contact member, and the arm can be removed when removing the movable sleeve. Rotate so that it does not get in the way of removal.

  The invention according to claim 2 is as described above, and the movable sleeve is disposed between the movable sleeve and the cylinder head when the contact member is slid in the direction of the cylinder head when the contact member is pushed in as much as possible. It is formed so that there is a margin. For this reason, when the contact member is pressed against the workpiece, no impact load is directly applied to the movable sleeve. For this reason, it is not necessary to improve the material strength of the movable sleeve and increase the plate thickness, and the manufacturing cost and weight can be reduced.

  In addition, since a load is not directly applied to a member (for example, an arm described later) that connects the movable sleeve and the contact member, the connecting member can be reduced in cost and weight.

Further, the invention according to claim 3 is as described above, and since the arm is a metal wire, the manufacturing cost can be greatly reduced as compared with the case where a sheet metal member or the like is used as in the prior art. it can.

Further, the invention according to claim 4 is as described above, and the guide block is provided between the contact member and the arm. Therefore, for example, even when a wire is used for the arm, the contact member stably holds the arm. Can be pressed.

It is sectional drawing of the gas combustion type driving tool which concerns on embodiment of this invention, Comprising: It is a figure which shows the internal structure before a contact. It is sectional drawing of the gas combustion type driving tool which concerns on embodiment of this invention, Comprising: It is a figure which shows the internal structure after contact. It is an external view of the movable sleeve which concerns on embodiment of this invention. It is a longitudinal cross-sectional view of the movable sleeve which concerns on embodiment of this invention. It is the schematic which shows the mechanism of the gas combustion type driving tool which concerns on embodiment of this invention, Comprising: It is a figure which shows the state before a contact. It is the schematic which shows the mechanism of the gas combustion type driving tool which concerns on embodiment of this invention, Comprising: It is a figure which shows the state after contact. It is the schematic which shows the mechanism of the gas combustion type driving tool which concerns on embodiment of this invention, Comprising: It is a figure which shows a mode that a movable sleeve is removed. It is sectional drawing of the gas combustion type driving tool which concerns on a prior art example. It is sectional drawing which shows the seal structure of the combustion chamber before improvement. It is an expanded sectional view which shows the seal structure of the combustion chamber before improvement. It is sectional drawing which shows the seal structure of the combustion chamber after improvement. It is an expanded sectional view which shows the seal structure of the combustion chamber after improvement. It is a figure which shows the seal structure of the combustion chamber which concerns on embodiment of this invention, and is an expanded sectional view explaining the modification which provided the hole for releasing a back pressure. It is a figure which shows the seal structure of the combustion chamber which concerns on embodiment of this invention, and is an expanded sectional view explaining the modification using a different O-ring. It is a figure which shows the filter structure of the cylinder cap which concerns on a prior art example. It is a figure which shows the filter structure of the cylinder cap which concerns on embodiment of this invention.

  A first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the gas combustion type driving tool 10 according to the present embodiment has a grip housing 12 connected to the rear of a body housing 11 in which a cylinder 13 is accommodated. A striking piston 15 in which a driver 14 for striking a nail is coupled to the lower surface side is slidably accommodated. A nose portion 16 is formed at the lower portion of the body housing 11 to form an injection port 17 for driving and guiding a nail toward a driven material. A driver 14 coupled to the striking piston 15 is attached to the nose. It is slidably accommodated and guided in the injection port 17 of the part 16. A magazine 18 loaded with a large number of nails is connected to the rear side of the nose portion 16, and the nails in the magazine 18 are sequentially supplied into the injection port 17 of the nose portion 16 and supplied into the injection port 17. The nail thus struck is struck by the driver 14 and driven out from the injection port 17 onto the workpiece.

  A combustion chamber 19 is formed above the cylinder 13 to generate a mixed gas of combustible gas and air and to burn the mixed gas. The combustion chamber 19 is formed by a movable sleeve 22 disposed so as to be slidable with respect to the cylinder 13. Specifically, a plurality of openings provided in the upper part of the side surface of the cylinder 13 are provided with an annular movable sleeve 22. By covering with, it is possible to form a sealed space communicating with the inside of the cylinder 13 inside the movable sleeve 22, and the combustion chamber 19 is formed in this sealed space. In the combustion chamber 19, a mixed gas of combustible gas and air is generated, and the pressure of the combustion gas generated by burning the mixed gas is applied to the striking piston 15, so that the striking piston 15 is placed in the cylinder 13. It is made to drive to the bumper 23 arrange | positioned in the bottom dead center position.

  The movable sleeve 22 forming the combustion chamber 19 is slidably disposed along the operating direction of the striking piston 15, and before the gas combustion type driving tool 10 is started, as shown in FIG. Further, the movable sleeve 22 is disposed at a lower position, and a passage 24 formed between the outer peripheral surface of the cylinder 13 and the inner peripheral surface of the body housing 11 communicates with the inside of the combustion chamber 19. Further, when nailing with the gas combustion type driving tool 10, as shown in FIG. 2, the movable sleeve 22 is operated to the upper position so that the combustion chamber 19 is shut off from the atmosphere. Note that an O-ring 25 is provided at the upper end and lower end of the movable sleeve 22 for sealing so that the mixed gas in the combustion chamber 19 does not leak.

  As shown in FIG. 1, a guide block 27 is slidably disposed in a space between the inner peripheral surface of the body housing 11 and the outer peripheral surface of the cylinder 13, and the guide block 27 will be described later. In order to guide the sliding of the movable sleeve 22. The lower end portion of the guide block 27 is connected to the upper end portion of the contact member 28 arranged so as to protrude in the distal end direction of the injection port 17 of the nose portion 16. For this reason, as shown in FIG. 2, when the contact member 28 is pushed into the interior by the operation of pushing the nose portion 16 of the gas combustion type driving tool 10 against the workpiece, the guide block 27 is pushed upward. It has become so. The movable sleeve 22 is actuated upward by the guide block 27 pushed upward, and the combustion chamber 19 is shut off from the atmosphere and sealed.

  A supply port 29 facing the combustion chamber 19 is formed in the cylinder head 21 covering the upper end of the cylinder 13 in order to supply the combustible gas into the combustion chamber 19. The supply port 29 is provided with a connection portion 30 for attaching the gas supply pipe 31, and the supply port 29 is connected to the gas supply pipe 31 by the connection portion 30. The gas supply pipe 31 is for guiding the gas fuel supplied from the fuel supply device 32 to the combustion chamber 19. The fuel supply device 32 is for supplying gas fuel to the combustion chamber 19 and includes a valve for controlling the supply amount of the gas fuel. Specifically, the fuel supply device 32 is connected to a fuel container 34 filled with liquefied gas fuel via a gas pipe 33, and the movable sleeve 22 is moved upward by pressing the nose portion 16 against the material to be driven. After moving and the inside of the combustion chamber 19 is sealed, a certain amount of combustible gas is supplied from the fuel container 34 into the combustion chamber 19 through the gas pipe 33.

  The fuel container 34 filled with the gas fuel is accommodated in a fuel container accommodating portion 42 provided in the grip housing 12, as shown in FIG. A nozzle 44 is provided near the outflow path of the fuel container 34 and is connected to a gas pipe 33 which is a stainless steel pipe. As shown in FIG. 3, the fuel container 34 and the fuel supply device 32 are connected by the gas pipe 33, and the gas pipe 33 is accommodated in a gas pipe accommodating portion 43 provided in the grip housing 12. .

  Further, the cylinder head 21 has a rotating fan for agitating the combustible gas supplied into the combustion chamber 19 with the air in the combustion chamber 19 to generate a mixture gas having a predetermined air-fuel ratio in the combustion chamber 19. 35 is formed. The rotary fan 35 has wings arranged radially by an electric motor (not shown) rotated along the peripheral wall of the combustion chamber 19, and the air in the combustion chamber 19 is combusted by the rotary fan 35. It is moved along the annular peripheral wall of the chamber 19 to generate a flow of air in the circumferential direction and the vertical direction in the combustion chamber 19. The rotary fan 35 is driven and controlled by a control board 41 disposed inside the grip portion 12a, triggered by the switch 36 that is turned on when the movable sleeve 22 moves upward.

  Further, an ignition device 37 for igniting and burning the mixed gas generated in the combustion chamber 19 is formed in the cylinder head 21. The ignition device 37 is a general ignition plug that generates a spark by boosting the voltage of the battery 38 attached to the rear end of the grip portion 12a to a high voltage and discharging the high voltage. The spark is generated in the combustion chamber 19 in which the mixed gas is generated, so that the mixed gas is ignited and burned, and a high-pressure combustion gas is generated in the combustion chamber 19. The ignition device 37 is driven via the control board 41 based on an ignition switch 40 that is actuated by operating a trigger 39 formed at the base of the grip 12a.

  By the way, as described above, the movable sleeve 22 according to the present embodiment is operated upward through the guide block 27 when the contact member 28 is pushed into the inside. As shown, it is an annular member having a hollow portion 22b for forming the combustion chamber 19. The movable sleeve 22 is slidably fitted to the cylinder 13 so that the cylinder 13 passes through the hollow portion 22b. A cylinder head 21 is fixed to the upper end of the cylinder 13 so that the movable sleeve 22 cannot be removed from the upper end of the cylinder 13 when the movable sleeve 22 is attached to the cylinder 13.

  As shown in FIGS. 3 and 4, the movable sleeve 22 has a shaft hole 22a at a position facing the side surface, and a rotatable arm 53 is attached to the shaft hole 22a. The arm 53 is a metal wire, and both ends thereof are rotatably inserted into the shaft hole 22a. As shown in FIGS. 3 and 4, the central portion of the arm 53 hangs downward, and the vicinity of the central portion forms a contact portion 53 a that contacts the guide block 27. The movable sleeve 22 is supported by the contact member 28 from below through the guide block 27 in contact with the contact portion 53a.

  The mounting method of the arm 53 is not limited to the above, and the movable sleeve 22 is provided with a shaft, the arm 53 is provided with a shaft hole portion, and the movable sleeve 22 is received by the shaft hole of the arm 53 to be movable. You may make it the structure which attaches the arm 53 to the sleeve 22 so that rotation is possible.

  That is, in this embodiment, since the movable sleeve 22 is supported by the arm 53 that is a metal wire, the manufacturing cost is greatly reduced as compared with the case where a sheet metal member or the like is used. . Moreover, since the guide block 27 is provided between the contact member 28 and the arm 53, the arm 53 can be supported by the contact member 28, and even the arm 53 of the wire can be supported stably. .

  Here, FIG. 5 is a view showing a state (before contact) before the nose portion 16 of the gas combustion type driving tool 10 is pressed against the workpiece. Before the contact, as shown in FIG. 5, the contact member 28 is located at the bottom dead center by an urging means (not shown), and a guide block 27 is disposed on the upper end surface of the contact member 28. Furthermore, the contact part 53a of the arm 53 is arrange | positioned on it. At this time, the arm 53 is provided downward along the outer periphery of the cylinder 13, and the contact portion 53 a at the lowermost end is in contact with the guide block 27. The arm 53 is connected to the movable sleeve 22 at the upper side, thereby supporting the movable sleeve 22.

  When nailing with the gas combustion type driving tool 10, as shown in FIG. 6, the tip portion 28 a of the contact member 28 is operated by pressing the nose portion 16 of the gas combustion type driving tool 10 against the material to be driven. Is brought into contact with the workpiece and the contact member 28 is pushed into the interior. By this operation, the guide block 27 slides upward, and the arm 53 is pushed upward by the guide block 27 slid upward, that is, the movable sleeve 22 is pushed upward. Then, the sliding movable sleeve 22 seals the combustion chamber 19 by pushing the contact member 28 into the interior as much as possible.

  Incidentally, the stroke end of the operation of pushing in the contact member 28 is determined by the contact between the contact member 28 and the cylinder 13. That is, as shown in FIG. 6, the middle portion of the contact member 28 forms a bent receiving portion 28 b, and the contact member 28 is pushed further when the receiving portion 28 b comes into contact with the lower end portion of the cylinder 13. There is no such thing. At this time, as shown in FIG. 6, the movable sleeve 22 has a gap S <b> 1 between the movable sleeve 22 and the cylinder head 21, and is arranged with a margin between the movable sleeve 22 and the cylinder head 21.

  That is, the movable sleeve 22 is formed so as to be slidable to a position where it contacts the cylinder head 21 along the longitudinal direction of the cylinder 13, and to a position where the receiving portion 28 b of the contact member 28 contacts the lower end of the cylinder 13. When the contact member 28 is pushed in as much as possible, the contact member 28 slides in the direction of the cylinder head 21 so that there is a margin between the contact member 28 and the cylinder 13.

  In this way, the contact member 28 is pressed against the material to be driven in order to seal the combustion chamber 19, and the contact member 28 receives the impact load generated when the pressing operation is stopped. It is formed so that an impact load is not directly applied to the sleeve 22. For this reason, it is not necessary to improve the material strength of the movable sleeve 22 or increase the plate thickness, and the manufacturing cost and weight can be reduced. Further, since the arm 53 and the guide block 27 are not directly loaded, the manufacturing cost and weight of the arm 53 and the guide block 27 can be reduced.

  By providing this guide block 27, even if the shape and position of the contact member 28 and the arm 53 change, the gap with the body housing 11 can be maintained, so that intrusion of dust and the like can be prevented. Further, the movable sleeve 22 and the contact member 28 can be stably operated.

  Incidentally, as described above, the movable sleeve 22 according to the present embodiment is not connected to the contact member 28 but is provided as a separate and independent member so as to be separable from the contact member 28. For this reason, it can be easily removed from above by the operation of removing the cylinder head 21.

  In the present embodiment, the movable sleeve 22 and the contact member 28 are merely in contact with each other and are not connected to each other. However, the present invention is not limited to such a configuration. It may be separably connected via the fixing means. And when removing the movable sleeve 22, while removing the cylinder head 21, it is good also as releasing a fixing means from upper direction and removing the movable sleeve 22. FIG.

  In the present embodiment, as shown in FIG. 16, the cylinder head 21 is directly bolted to the cylinder 13 and the cylinder cap 20 is bolted to the cylinder head 21. For this reason, as shown in FIG. 7, by removing the cylinder head 21 after removing the cylinder cap 20, the movable sleeve 22 can be removed simply by lifting up, and components such as grips, magazines, noses, etc. Even without disassembling, it is possible to easily remove only the movable sleeve 22 and perform maintenance such as cleaning.

  Moreover, since the arm 53 is rotatable with respect to the movable sleeve 22, when the movable sleeve 22 is extracted from the cylinder 13 in this way, the rotatable arm 53 can be retracted to a position where it is not caught. That is, it is possible to prevent the arm 53 from getting in the way when the movable sleeve 22 is removed.

  Incidentally, in the conventional gas combustion type driving tool 10, as shown in FIG. 8, an O-ring 25 for sealing the inside of the combustion chamber 19 is provided in the cylinder 13 or the cylinder head 21. That is, an O-ring 25 is fitted on the outer periphery of the cylinder 13 or the cylinder head 21, and the outer peripheral side of the O-ring 25 is brought into contact with the inner periphery of the movable sleeve 22 for sealing. However, such a conventional structure may be an obstacle to weight reduction and miniaturization.

  Therefore, in the gas combustion type driving tool 10 according to the present embodiment, an O-ring 25 is provided on the inner circumference of the movable sleeve 22 and the inner circumference side of the O-ring 25 is brought into contact with the outer circumference of the cylinder 13 for sealing. . If it does in this way, it not only contributes to weight reduction and size reduction, but replacement | exchange of the O-ring 25 can also be made easy by removing the movable sleeve 22. FIG.

  Here, FIGS. 9 and 10 are diagrams showing an example in which an O-ring 25 is simply provided on the inner periphery of the movable sleeve 22. In this example, a ring groove 22c is provided on the inner periphery of the movable sleeve 22, and an O-ring 25 is fitted into the ring groove 22c. However, the structure as in this example has problems in the following points. That is, when the nail is hit continuously, the O-ring 25 is linearly expanded by the heat generated in the combustion chamber 19 and the inner diameter of the O-ring 25 is increased. Then, as a result of the increase in the inner diameter of the O-ring 25, a gap S2 is generated between the O-ring 25 and the cylinder 13 and the like, and a sealing failure occurs. Further, since the periphery of the combustion chamber 19 is exposed to heat, it is necessary to use an O-ring 25 having a large inner diameter tolerance such as made of fluororubber, and there is a problem that it is difficult to set a dimensional tolerance in anticipation of thermal expansion.

  Therefore, in the present embodiment, as shown in FIGS. 11 and 12, the ring groove 22c into which the O-ring 25 is fitted is formed in a dovetail shape, and the O-ring 25 having a small inner diameter is pulled into the dovetail ring ring groove 22c. To be assembled. That is, the inner diameter of the O-ring 25 is set smaller than the inner diameter of the ring groove 22c, and the cross-sectional diameter of the O-ring 25 is set larger than the width of the opening of the ring groove 22c. Thereby, the O-ring 25 is pulled and held so as to expand along the opening of the ring groove 22c, and the O-ring 25 is prevented from jumping out of the ring groove 22c. A part on the inner diameter side of the O-ring 25 protrudes from the opening of the ring groove 22c, and the protruding part closes the gap between the cylinder 13 and the movable sleeve 22 and seals it.

  If the O-ring 25 is pulled and assembled in this manner, dimensional tolerances can be absorbed, and sealing performance can be ensured even if the diameter is expanded by thermal expansion.

  Depending on the shape of the ring groove 22c provided in the movable sleeve 22, the combustion pressure when the combustion gas is burned in the combustion chamber 19 may enter the ring groove 22c instantaneously. For this reason, as shown in FIGS. 13B and 13C, an escape hole 22d for releasing the combustion pressure may be provided.

  Further, in the above-described embodiment, the O-ring 25 is used as the seal member and the ring groove 22c has a dovetail shape. However, the present invention is not limited to this. For example, as shown in FIG. 14, the ring groove 22c may not be formed into a dovetail shape, and a device may be added to the seal member 54.

  That is, as shown in FIG. 14A, a circumferential groove 54a is provided inside the elastic seal member 54, and the combustion pressure enters the circumferential groove 54a to expand the seal member 54, thereby improving the sealing performance. It is good also as a structure.

  As shown in FIG. 14B, a circumferential groove 54 a is provided inside the elastic seal member 54, and a circumferential protrusion 22 e that fits into the circumferential groove 54 a is provided in the ring groove 22 c of the movable sleeve 22. May be. That is, the circumferential protrusion 22e may be fitted with the circumferential groove 54a of the seal member 54 to correct the thermal expansion and deformation of the seal member 54 with the circumferential protrusion 22e.

  Moreover, as shown in FIG.14 (c), you may make it the structure which covers the metal rings 54c with the resin part 54b, and a thermal expansion and a deformation | transformation do not occur easily.

  Next, the cylinder cap 20 of the gas combustion type driving tool 10 according to the present embodiment will be described.

  First, a conventional cylinder cap 20 will be described with reference to FIG. As shown in FIG. 15, the conventional cylinder cap 20 is fixed to the upper end portion of the body housing 11 so as to cover the cylinder head 21, and is attached to the body housing 11 so as to sandwich the cylinder head 21. The cylinder head 21 and the body housing 11 are fixed together with bolts. The cylinder cap 20 is provided with a slit for passing outside air, and a filter 50 for removing dust and the like is attached to the outside of the slit. The filter 50 is formed of a sponge, a wire mesh, or the like, and is fixed to the cylinder cap 20 by being sandwiched by a filter cover 51 that is fitted and fixed to the cylinder cap 20.

  Since the conventional cylinder cap 20 is configured as described above, in order to remove the filter 50 in order to perform regular cleaning, it is necessary to remove the filter cover 51 first. For this reason, when the filter cover 51 is removed, dust or the like adhering to the filter 50 may spill and enter the machine. Further, when there is a gap on the outer periphery of the filter 50, dust or the like may enter the machine through the gap.

  Therefore, in the gas combustion type driving tool 10 according to the present embodiment, the filter 50 is insert-molded into the cylinder cap 20 as shown in FIG. That is, since it is not necessary to remove the filter cover 51, the filter cover 51 is formed so that dust or the like does not spill when entering the machine.

  Further, in order to facilitate removal of the cylinder cap 20, the cylinder head 21 is directly bolted to the cylinder 13 and the cylinder cap 20 is bolted to the cylinder head 21. That is, since the cylinder cap 20 is not configured to be fixed to the body housing 11 with the cylinder head 21 interposed therebetween, the cylinder cap 20 can be removed regardless of the cylinder head 21. Since the cylinder cap 20 can be easily removed as described above, the filter 50 can be easily cleaned by removing the cylinder cap 20 and cleaning the filter 50 that is insert-molded in the cylinder cap 20.

  By the way, the above-described attachment of the cylinder cap 20 uses not only bolt fastening to the cylinder head 21 but also hooking fixation. That is, as shown in FIG. 16, the cylinder cap 20 is fixed so as to cover the body housing 11 by fitting the fitting concave portion 20 a of the cylinder cap 20 and the fitting convex portion 11 a of the body housing 11. The After the cylinder cap 20 and the body housing 11 are engaged in this way, the cylinder cap 20 is fixed to the cylinder head 21 with one bolt. Thereby, the cylinder cap 20 is fixed easily and reliably. Further, as shown in FIG. 16, since the cylinder cap 20 and the body housing 11 are assembled so as to overlap, it has a structure in which dust or the like is difficult to enter from the side surface.

  According to the cylinder cap 20 according to the present embodiment as described above, intrusion of dust and the like can be prevented and the number of parts can be reduced because the cylinder cap 20 has the functions of the filter 50 and the filter cover 51. Therefore, it is possible to reduce mold manufacturing costs and component costs.

  In the above-described embodiment, the cylinder head 21 is bolted directly to the cylinder 13 and the cylinder cap 20 is bolted to the cylinder head 21. However, the present invention is not limited to this. For example, the cylinder cap 20 in which the filter 50 is insert-molded may be used, and the cylinder cap 20 and the cylinder head 21 may be fixed to the body housing 11 together with bolts.

  Alternatively, the cylinder cap 20 may be fixed only by hook fixing by the snap-fit method without fixing the cylinder cap 20 to the cylinder head 21 by bolts. At this time, the object to which the cylinder cap 20 is assembled may be the body housing 11, the cylinder 13, or the cylinder head 21.

  Further, instead of insert molding the filter 50 into the cylinder cap 20, the filter 50 may be insert molded into the filter cover 51. That is, the filter 50 may be insert-molded in a conventional filter cover 51 as shown in FIG. 15 and the filter cover 51 may be attached to the cylinder cap 20.

  As described above, according to this embodiment, the movable sleeve 22 is provided so as to be separable from the contact member 28, and this movable sleeve 22 is formed so as to be removable from above when the cylinder head 21 is removed. Therefore, the movable sleeve 22 forming the combustion chamber 19 can be easily removed without disassembling components such as a grip, a magazine, and a nose, and maintainability can be improved.

  Further, the movable sleeve 22 is provided with a rotatable arm 53, and when the contact member 28 is operated, the movable sleeve 22 is slid through the arm 53, so that the manufacturing cost is reduced and the weight is reduced. Is possible. Moreover, since the arm 53 can be rotated when removing the movable sleeve 22, the removal of the movable sleeve 22 is easy.

  In addition, since the arm 53 and the movable sleeve 22 do not receive an impact when the contact member 28 is operated to the stroke end, it is not necessary to improve the material strength of the arm 53 or the movable sleeve 22 and to increase the plate thickness. The manufacturing cost and weight can be reduced.

DESCRIPTION OF SYMBOLS 10 Gas combustion type driving tool 11 Body housing 11a Fitting convex part 12 Grip housing 12a Grip part 13 Cylinder 14 Driver 15 Stroke piston 16 Nose part 17 Injection port 18 Magazine 19 Combustion chamber 20 Cylinder cap 20a Fitting recessed part 21 Cylinder head 22 Movable Sleeve 22a Shaft hole 22b Hollow portion 22c Ring groove 22d Relief hole 22e Circumferential protrusion 23 Bumper 24 Passage 25 O-ring 27 Guide block 28 Contact member 28a Tip portion 28b Receiving portion 29 Supply port 30 Connection portion 31 Gas supply pipe 32 Fuel supply device 33 Gas pipe 34 Fuel container 35 Rotating fan 36 Switch 37 Ignition device 38 Battery 39 Trigger 40 Ignition switch 41 Control board 42 Fuel container housing part 43 Gas pipe housing part 44 Nozzle 50 Filter 51 Filter cover 53 Arm 53a Contact part 54 Seal member 54a Circumferential groove 54b Resin part 54c Metal ring

Claims (4)

A cylinder disposed in the housing;
A cylinder head provided above the cylinder;
A movable sleeve that is slidably disposed relative to the cylinder to form a combustion chamber;
A nose portion forming an injection port below the cylinder;
A contact member that protrudes in the tip direction of the nose part, and is pressed into the object when pressed against the material to be driven, and the movable sleeve is slid to seal the combustion chamber;
Have
The movable sleeve is provided to be separable from the contact member, and is formed to be removable from above the cylinder when the cylinder head is removed .
An arm is rotatably attached to a position where the movable sleeve is opposed to a side surface, and the movable sleeve is supported by the contact member via the arm . The movable sleeve is formed to be slidable along the longitudinal direction of the cylinder, and when the contact member is pushed to the maximum and slides in the direction of the cylinder head, The gas combustion type driving tool according to claim 1, wherein the gas burning type driving tool is formed so as to have a gap therebetween . The gas combustion type driving tool according to claim 1 or 2 , wherein the arm is a metal wire. The gas combustion type driving tool according to claim 3 , wherein a guide block is provided between the contact member and the arm.

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