JP5516185B2 - Gas fired driving tool - Google Patents

Description

  The present invention relates to a gas combustion type driving tool for driving a fastening material at a combustion pressure of gas fuel, and more particularly to an arrangement of a combustion chamber for burning gas fuel and a fuel supply device for supplying the fuel gas to the combustion chamber. The present invention relates to a combustion type driving tool having features.

  As an example of a gas-fired impact tool, a combustible gas is injected into a sealed combustion chamber to generate a mixed gas of combustible gas and air in the combustion chamber, and the mixed gas is burned in the combustion chamber. A high-pressure combustion gas is generated in the room, and this high-pressure combustion gas is caused to act on the striking piston accommodated in the striking cylinder, so that the striking piston is shockedly driven in the striking cylinder. There is known a gas combustion type driving tool in which a nail is driven into wood, a steel plate, concrete, or the like by a combined driver.

  In such a gas combustion type driving tool, a fuel container such as a gas can filled with liquefied fuel gas is mounted in the tool, and a battery as a power source for igniting the combustible gas is mounted on the tool. Therefore, it is possible to perform a driving operation of a nail or a pin without being restricted by a power supply source such as electric power or compressed air.

  In such a gas combustion type driving tool, a striking cylinder in which a striking piston is slidably accommodated is disposed in the housing, and a driver for striking a nail is coupled to the lower surface side of the striking piston, A driver is accommodated and guided in an injection port formed in a nose portion coupled to the lower portion of the housing. When the impact piston is driven in the impact cylinder, the driver coupled to the impact piston is driven in shock in the injection port, and the nail supplied into the injection port of the nose portion is moved from the injection port to the tip of the nose portion. It forms so that it may drive out toward the to-be-placed material arrange | positioned in.

  A combustion chamber is formed in the upper part of the striking cylinder by an annular sleeve. Combustion gas generated in the combustion chamber acts on the striking piston to drive the striking piston in the striking cylinder. Gas fuel is supplied into the combustion chamber by a fuel supply device having a valve for controlling the supply amount of the gas fuel, and this fuel supply device burns combustible gas filled in a gas container such as a cartridge. Supply indoors. The combustible gas thus supplied into the combustion chamber is agitated and mixed with the air in the combustion chamber by a rotating fan to generate a mixed gas having a predetermined air-fuel ratio.

  Further, an ignition device is formed in the combustion chamber for igniting the mixed gas generated in the combustion chamber and explosively burning the mixed gas in the combustion chamber. The ignition device is usually formed by a spark plug or the like that generates a spark by discharging a high voltage, and is operated by an operator operating a trigger to generate a spark in the combustion chamber, thereby mixing in the combustion chamber. The nailer is driven by igniting the gas.

  For example, Patent Document 1 discloses a combustion pressure-operated tool that supplies liquid fuel contained in a fuel container to a combustion chamber using a fuel supply device. In this combustion pressure operation type tool, liquid fuel is heated in a passage from the fuel supply device to the combustion chamber, and the fuel is vaporized to generate a mixed gas in the combustion chamber.

Japanese Patent No. 3872148

  However, in the combustion pressure operation type tool described in Patent Document 1 described above, the distance of the passage from the fuel supply device to the combustion chamber is formed long by disposing the fuel supply device at a position away from the combustion chamber, and the combustion It takes time to supply fuel to the chamber. For this reason, there was a problem that it took time to ignite. Currently, in order to solve this problem, countermeasures such as increasing the amount of fuel supplied to the combustion chamber are taken, but this countermeasure has a new problem of wasteful use of fuel. .

  Therefore, an object of the present invention is to provide a gas combustion type driving tool that can shorten the distance of the fuel passage from the fuel supply device to the combustion chamber and can shorten the time until ignition.

  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 is a gas combustion type driving tool for driving a fastening material with a combustion pressure of gas fuel, and a combustion chamber for burning gas fuel, and a gas in the combustion chamber A fuel supply device for supplying fuel; and a gas supply pipe for guiding the gas fuel supplied from the fuel supply device to the combustion chamber, wherein the fuel supply device and the combustion chamber are arranged adjacent to each other. And a fuel container housing part for housing a fuel container filled with liquefied gas fuel, and the fuel container housed in the fuel container housing part and the fuel supply device are connected by a gas pipe, and the inside of the body housing by partitioning by blocking wall, and a gas pipe accommodating portion for accommodating the gas pipe, the hot air from the combustion chamber to form a air flow path to flow in the direction of the fuel container holder And features.

(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 combustion chamber includes a connection part for attaching the gas supply pipe, and at least a part of the gas supply pipe is formed of a material having a lower thermal conductivity than the connection part. Features.

(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, an air layer portion is provided between the fuel supply device and the combustion chamber.

(Claim 4)
The invention according to claim 4 is characterized by the following points in addition to the features of the invention according to any one of claims 1 to 3.

  That is, a heat insulating member is provided between the fuel supply device and the combustion chamber.

(Claim 5)
The invention according to claim 5 is characterized by the following points in addition to the features of the invention according to any one of claims 1 to 4.

That, characterized in that the fuel container housing portion is provided on the grip housing that is provided continuously to the rear of the body housing.

(Claim 6)
The invention described in claim 6 is characterized by the following points in addition to the features of the invention described in any one of claims 1-5 .

That is, the gas pipe housing part is provided with a heat exhaust port communicating with the outside.

(Claim 7)
The invention described in claim 7 is characterized by the following points in addition to the characteristics of the invention described in any one of claims 1-6 .

That is, at least a part of the gas supply pipe is formed of an elastic member .

  The invention according to claim 1 is as described above, and includes a combustion chamber for burning gas fuel, a fuel supply device for supplying gas fuel to the combustion chamber, and a gas fuel supplied from the fuel supply device. A gas supply pipe for leading to the combustion chamber, and the fuel supply device and the combustion chamber are arranged adjacent to each other, so that the distance of the fuel passage from the fuel supply device to the combustion chamber can be shortened. , Can shorten the time until ignition.

The invention according to claim 2 is as described above, wherein the combustion chamber includes a connection part for attaching the gas supply pipe, and at least a part of the gas supply pipe is more than the connection part. However, even though the fuel supply device is disposed near the combustion chamber, the heat generated in the combustion chamber is hardly transmitted to the fuel supply device. For this reason, the liquefied gas fuel becomes difficult to vaporize in the fuel supply device, and for example, the problem that the flow rate adjustment in the fuel supply device is not correctly performed due to the vaporization of the gas fuel can be avoided.
The fuel container accommodated in the fuel container accommodating portion and the fuel supply device are connected by a gas pipe, and a blocking wall is provided between the gas pipe accommodating portion accommodating the gas pipe and the combustion chamber. Therefore, it is difficult for the heat in the combustion chamber to be transmitted, and the gas fuel liquefied in the gas pipe can be prevented from being vaporized.
Further, since the fuel container housing portion is provided with a heat transfer means (air flow path) for transmitting heat generated in the combustion chamber, the fuel container filled with the liquefied gas fuel is heated, so that the fuel container And the temperature difference between the fuel supply device and the gas pipe can be reduced. This makes it difficult for pressure changes due to temperature differences to occur, and vaporization of liquefied gas fuel due to pressure changes can be suppressed.

  Further, the invention according to claim 3 is as described above, and an air layer portion is provided between the fuel supply device and the combustion chamber. Therefore, the fuel supply device is arranged near the combustion chamber. Nevertheless, the fuel supply device can be made difficult to receive radiant heat from the combustion chamber, and the gas fuel liquefied in the fuel supply device can be prevented from being vaporized.

  The invention according to claim 4 is as described above, and since a heat insulating member is provided between the fuel supply device and the combustion chamber, the fuel supply device is arranged near the combustion chamber. Nevertheless, the fuel supply device can be made difficult to receive radiant heat from the combustion chamber, and the gas fuel liquefied in the fuel supply device can be prevented from being vaporized.

  Further, the invention according to claim 5 is as described above, and includes a fuel container housing portion for housing a fuel container filled with liquefied gas fuel, and this fuel container housing portion is provided on the grip housing side. The gas combustion type driving tool can be formed compactly.

Further, the invention according to claim 6 is as described above, and the gas pipe housing portion is provided with a heat exhaust port communicating with the outside, so that the heat of the gas pipe housing portion can be released to the outside. It is possible to suppress vaporization of the liquefied gas fuel in the gas pipe.

The invention according to claim 7 is as described above, and since at least a part of the gas supply pipe is formed of an elastic member, the bent portion of the gas supply pipe can be reduced, and the pipe line Fuel can be supplied quickly by making resistance difficult.

It is sectional drawing of the gas combustion type driving tool before contact. It is sectional drawing of the gas combustion type driving tool after contact. It is a decomposition | disassembly partial enlarged view of the fuel supply apparatus vicinity. (A) Partial enlarged view in the vicinity of the trigger (b) Cross-sectional view in the vicinity of the trigger (A-A cross-sectional view in (a)). It is the elements on larger scale which show the position of a gas pipe. It is sectional drawing (BB sectional drawing of FIG. 6) along a gas pipe.

  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 is configured such that a grip housing 12 is continuously provided behind a body housing 11 that houses a striking cylinder 13. A striking piston 15 in which a driver 14 for striking a nail is coupled to the lower surface 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 the driven material. A driver 14 coupled to the striking piston 15 is attached to the nose portion 16. It is slidably accommodated and guided in the injection port 17 of the nose portion 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 striking 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 an annular movable sleeve 22 disposed between the upper end of the striking cylinder 13 to which the upper end surface of the striking piston 15 is exposed and the upper wall 21 formed inside the upper housing 20. ing. 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 striking the cylinder 13. It is made to drive to the bumper 23 arrange | positioned in the inside 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 striking 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 FIGS. 1 and 2, a link member 26 and a guide block 27 are slidably disposed in a space between the inner peripheral surface of the body housing 11 and the outer peripheral surface of the striking cylinder 13. The upper end of the guide block 27 pushed by the link member 26 operates the movable sleeve 22 upward. As described above, the movable sleeve 22 is operated upward and the combustion chamber 19 is sealed. Yes. Note that the lower end portion of the link member 26 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, and the nose portion of the gas combustion type driving tool 10. When the contact member 28 is pressed against the workpiece, the contact member 28 is operated to operate the movable sleeve 22 upward through the link member 26 and the guide block 27 so as to block the combustion chamber 19 from the atmosphere. ing.

  A supply port 29 facing the combustion chamber 19 is formed in the upper housing 20 forming the upper wall 21 of the combustion chamber 19 in order to supply a 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. .

  The upper housing 20 is also provided with a rotary fan for agitating the combustible gas supplied into the combustion chamber 19 with the air in the combustion chamber 19 to generate a mixed gas having a predetermined air-fuel ratio in the combustion chamber 19. 35 is formed. The rotary fan 35 has wings arranged radially that are rotated along the peripheral wall of the combustion chamber 19 by an electric motor (not shown) housed in a recess formed in the upper housing 20. The rotary fan 35 moves the air in the combustion chamber 19 along the annular peripheral wall of the combustion chamber 19 to generate a circumferential air flow 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.

  Furthermore, an ignition device 37 for igniting and burning the mixed gas generated in the combustion chamber 19 is formed in the upper housing 20. 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, in this embodiment, as shown in FIGS. 1 and 2, the combustion chamber 19 for combusting the gas fuel and the fuel supply device 32 for supplying the gas fuel to the combustion chamber 19 are made of ceramic. Are arranged adjacent to each other with the heat insulating member 47 interposed therebetween. For this reason, the distance of the fuel passage from the fuel supply device 32 to the combustion chamber 19 is shortened, the fuel can be supplied quickly, and the time until ignition can be shortened.

  Here, the heat insulating member 47 provided between the combustion chamber 19 and the fuel supply device 32 is disposed so as to form a gap between the body housing 11 and the fuel supply device 32 and the combustion. An air layer portion 48 is formed between the chamber 19. Thus, since the air layer portion 48 is provided in addition to the heat insulating member 47 between the fuel supply device 32 and the combustion chamber 19, the fuel supply device 32 is disposed adjacent to the combustion chamber 19. Nevertheless, the fuel supply device 32 is less likely to receive radiant heat from the combustion chamber 19, and the liquefied gas fuel is prevented from being vaporized in the fuel supply device 32.

  Further, as described above, the gas supply pipe 31 for guiding the gas fuel supplied from the fuel supply device 32 to the combustion chamber 19 is connected to the connection portion 30 provided above the combustion chamber 19. The gas supply pipe 31 is made of a material having a lower thermal conductivity than that of the connection part 30. Specifically, a gas supply pipe 31 made of silicon rubber or fluororubber is attached to the metal connection portion 30. For this reason, it is difficult for the heat in the combustion chamber 19 to be transmitted to the gas supply pipe 31 having a low thermal conductivity, and the combustion is performed despite the fuel supply device 32 being disposed adjacent to the combustion chamber 19. The heat of the chamber 19 is not easily transmitted to the fuel supply device 32 via the gas supply pipe 31, and the liquefied gas fuel is suppressed from being vaporized in the fuel supply device 32.

  As described above, since the gas supply pipe 31 is an elastic member made of silicon rubber or fluororubber, the bent portion can be reduced. For this reason, it becomes possible to supply fuel quickly by making it difficult to receive the pipe resistance, and there is also an advantage that the fuel can be smoothly supplied to the combustion chamber 19.

  Further, in the present embodiment, as shown in FIG. 3, a blocking wall 45 for blocking heat transfer is provided between the gas pipe housing portion 43 that houses the gas pipe 33 and the combustion chamber 19. Thereby, the gas pipe accommodating portion 43 and the combustion chamber 19 are separated. For this reason, it is difficult for the heat of the combustion chamber 19 to be transmitted to the gas pipe 33, and the gas pipe 33 is warmed to prevent the liquefied gas fuel from being vaporized in the gas pipe 33. More specifically, the air in the combustion chamber 19 is exhausted (exhaust heat) in the direction of the body discharge port 49 of the body housing 11 and the grip housing 12 through the passage 24 communicating with the inside of the combustion chamber 19. Air (heat) flows in the direction of arrow D in 4 (b). However, as shown in FIG. 4 (b), since a blocking wall 45 that blocks the flow of air (heat) is provided, the air (heat) is directed toward the gas pipe housing portion 43 that houses the gas pipe 33. It has become impossible to flow to.

  Incidentally, the gas pipe 33 described above is extended in the vertical direction as shown by a one-dot chain line (PIPE) in FIG. 5, and the air (heat) from the combustion chamber 19 along the gas pipe 33. Then, it flows in the direction of the fuel container housing part 42. In other words, air (heat) from the combustion chamber 19 flows next to the gas pipe housing portion 43 separated by the blocking wall 45. For this reason, even if the blocking wall 45 is provided, it is inevitable that the temperature in the gas pipe housing portion 43 rises. Therefore, the gas pipe housing portion 43 has a cross section along the gas pipe 33. As shown in FIG. 6, a heat exhaust port 46 communicating with the outside is provided. That is, the gas pipe housing portion 43 is formed by partitioning the inside of the body housing 11 with the blocking wall 45, and a plurality of exhaust heat is formed on the outer wall of the body housing 11 that forms the gas pipe housing portion 43. An opening 46 is formed. For this reason, the heat that has entered the gas pipe housing portion 43 can be released to the outside through the exhaust heat port 46, and the gas fuel liquefied by the gas pipe 33 being warmed can be prevented from being vaporized.

  Furthermore, as described above, the air (heat) from the combustion chamber 19 flows in the direction of the fuel container housing portion 42, so that the fuel stored in the fuel container housing portion 42 by the heat generated in the combustion chamber 19. The container 34 is formed to be warmed. That is, this air flow path functions as a heat transfer means for transferring the heat generated in the combustion chamber 19 to the fuel container housing portion 42. For this reason, the fuel container 34 is warmed by the heat generated in the combustion chamber 19, and the temperature difference between the fuel container 34 and the fuel supply device 32 and the gas pipe 33 near the combustion chamber 19 becomes small, and the pressure due to the temperature difference The liquefied gas fuel is prevented from being vaporized by the change.

  As described above, according to the present embodiment, since the fuel supply device 32 and the combustion chamber 19 are arranged adjacent to each other, the pipeline of the gas supply pipe 31 is shortened. Further, since the bent portion of the gas supply pipe 31 is formed to be small, the pipe resistance of the gas supply pipe 31 is small. Therefore, the fuel supply to the combustion chamber 19 can be performed quickly, and the time until ignition can be shortened.

  Furthermore, since various means for suppressing the gas fuel liquefied by the radiant heat of the combustion chamber 19 from being vaporized are provided, for example, when the gas fuel is vaporized, the flow rate adjustment in the fuel supply device 32 is correctly performed. The problem of not being performed can be avoided.

  In the above-described embodiment, the fuel supply device 32 is provided in the grip housing 12. However, the present invention is not limited to this. For example, the fuel supply device 32 may be provided on the cylinder head, or the body housing. The fuel supply device 32 may be mounted outside the 11 side.

  In the above-described embodiment, the gas pipe 33 is also provided in the grip housing 12. However, the present invention is not limited to this, and the gas pipe 33 may be provided outside the grip housing 12. Further, in order to make the gas pipe 33 difficult to receive radiant heat, the gas pipe 33 itself may have a heat insulating effect, or may be covered or surrounded with a heat insulating material such as a heat insulating tape.

  In the above-described embodiment, the air flow path from the combustion chamber 19 to the fuel container housing part 42 is a heat transfer means for transmitting heat generated in the combustion chamber 19 to the fuel container housing part 42. Although explained, it is not limited to this. For example, a metal piece extending from the combustion chamber 19 to the fuel container housing portion 42 is used as a heat transfer means, and heat generated in the combustion chamber 19 can be transmitted to the fuel container housing portion 42 by this metal piece. Good.

DESCRIPTION OF SYMBOLS 10 Gas combustion type driving tool 11 Body housing 12 Grip housing 12a Grip part 13 Stroke cylinder 14 Driver 15 Stroke piston 16 Nose part 17 Injection port 18 Magazine 19 Combustion chamber 20 Upper housing 21 Upper wall 22 Movable sleeve 23 Bumper 24 Passage 25 O Ring 26 Link member 27 Guide block 28 Contact member 29 Supply port 30 Connection 31 Gas supply pipe 32 Fuel supply device 33 Gas pipe 34 Fuel container 35 Rotary 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 45 Blocking wall 46 Heat exhaust port 47 Heat insulation member 48 Air layer part 49 Body exhaust port

Claims (7)

A gas combustion type driving tool for driving a fastening material with a combustion pressure of gas fuel, a combustion chamber for burning gas fuel, a fuel supply device for supplying gas fuel to the combustion chamber, and a supply from the fuel supply device A gas supply pipe for guiding the gas fuel to the combustion chamber,
The fuel supply device and the combustion chamber are arranged adjacent to each other ,
A fuel container housing portion that houses a fuel container filled with liquefied gas fuel, and the fuel container housed in the fuel container housing portion and the fuel supply device are connected by a gas pipe,
By partitioning the inside of the body housing with a blocking wall, a gas pipe housing part for housing the gas pipe and an air flow path for flowing hot air from the combustion chamber toward the fuel container housing part are formed. A gas combustion type driving tool characterized by that. The combustion chamber includes a connection for attaching the gas supply pipe,
The gas combustion type driving tool according to claim 1, wherein at least a part of the gas supply pipe is formed of a material having a lower thermal conductivity than the connection portion.   The gas combustion type driving tool according to claim 1, wherein an air layer portion is provided between the fuel supply device and the combustion chamber.   The gas combustion type driving tool according to any one of claims 1 to 3, wherein a heat insulating member is provided between the fuel supply device and the combustion chamber. The fuel container accommodating unit is characterized in that provided on the grip housing that is provided continuously to the rear of the body housing, a gas combustion type driving tool according to claim 1. The gas combustion type driving tool according to any one of claims 1 to 5, wherein the gas pipe housing part is provided with a heat exhaust port communicating with the outside. At least in part, characterized in that it is formed of an elastic member, a gas combustion type driving tool according to any one of claims 1 to 6, wherein the gas supply pipe.

Images