TWI568548B - Gas burned into the tool - Google Patents

Description

Gas burning driving tool

The present invention relates to a gas combustion type driving tool for driving a fixing member by using a combustion pressure of a gas fuel, and more particularly to a gas combustion type driving tool characterized by a combustion chamber and a direction for burning a gas fuel. The configuration of the fuel supply control device that supplies the gas fuel to the combustion chamber.

The gas combustion type driving tool of the prior art injects flammable gas into the closed combustion chamber, and generates a mixed gas of flammable gas and air in the combustion chamber, and burns the mixed gas in the combustion chamber in the combustion chamber. Producing high-pressure combustion gas, and then causing the high-pressure combustion gas to act on the striking piston contained in the striking cylinder, and driving the striking piston in an impacting manner in the striking cylinder, and then using the driver combined with the lower side of the striking piston to nail or A fixing member such as a nail is driven into a driven piece such as wood or steel plate or concrete.

The gas combustion type driving tool mounts a fuel container such as a gas tank filled with a liquefied combustion gas in a tool, and mounts a battery for powering the flammable gas to the tool, thereby configuring It can be carried and can be used for the driving of the fasteners, and is not limited by the power supply source such as electric power or compressed air.

The striking cylinder slidably accommodates the striking piston and is disposed in the outer casing. The driver for striking the fixture is combined with the underside of the striking piston. The actuator is guided and housed in an ejection opening formed by a projection that is coupled to the lower portion of the outer casing. The actuator is driven in an impulsive manner by driving the striking piston in the striking cylinder, and the fixing member supplied into the ejection port is ejected from the ejection port toward the driven member disposed at the front end of the protruding portion.

The combustion chamber is formed in the upper portion of the striking cylinder by an annular sliding sleeve. The combustion gas generated in the combustion chamber acts on the striking piston, and drives the striking piston in the striking cylinder. The gas fuel is supplied into the combustion chamber by a fuel supply control device including a supply amount for controlling the gas fuel. The fuel supply control device supplies flammable gas filled in a gas container such as a gas cylinder into the combustion chamber. The combustible gas supplied to the combustion chamber is agitated and mixed with the air in the combustion chamber by a rotating fan to generate a mixed gas of a predetermined air-fuel ratio.

In the combustion chamber, an igniter is provided for igniting the mixed gas generated in the combustion chamber to cause the mixed gas to explosively combust in the combustion chamber. The ignition device generally has a spark plug or the like that generates a spark by discharging a high voltage, and the operator operates the trigger to generate a spark in the combustion chamber. Therefore, the mixed gas in the combustion chamber is clicked and driven. Nail machine.

For example, Japanese Patent No. 3872148 discloses a gas combustion type driving tool including a fuel supply control device that supplies liquid fuel contained in a fuel container to a combustion chamber. In the gas combustion type driving tool, the liquid fuel is heated in a passage from the fuel supply control device to the combustion chamber to vaporize the fuel, and a mixed gas is generated in the combustion chamber.

However, in the gas combustion type driving tool, the fuel supply control device is disposed at a position separated from the combustion chamber. That is, the distance from the fuel supply control device to the passage of the combustion chamber is long, and it takes time to supply the fuel to the combustion chamber. Therefore, there is a problem that time is time-consuming. Although the current situation has taken measures to increase the amount of fuel supplied to the combustion chamber in order to solve this problem, this countermeasure has a new problem of wasting fuel.

An object of the present invention is to provide a gas combustion type driving tool which can shorten the distance from the fuel supply control device to the fuel passage of the combustion chamber, and can shorten the time to the point.

One aspect of the present invention provides a gas-fired driving tool that uses a combustion pressure of a gas fuel to drive a fixing member. The gas combustion type driving tool is characterized in that: a combustion chamber is used for burning gas fuel; a fuel supply control device controls a supply amount of gas fuel, and supplies gas fuel to the combustion chamber; and a gas supply pipe, The gas fuel from the fuel supply control device is directed to the combustion chamber; the fuel supply control device is disposed adjacent to the combustion chamber.

According to this configuration, the distance from the fuel supply control device to the fuel passage of the combustion chamber can be shortened, and the time to the point can be shortened.

The combustion chamber may also include a connection portion to which the gas supply pipe is mounted, the gas supply pipe system being formed of a material having a lower thermal conductivity than the connection portion.

According to this configuration, heat generated in the combustion chamber is hardly transmitted to the fuel supply control device. Therefore, the liquefied gas fuel is suppressed from being vaporized in the fuel supply control device, and for example, the problem that the flow rate in the fuel supply control device cannot be properly adjusted due to gasification of the liquefied gas fuel can be avoided.

An air layer portion may be disposed between the fuel supply control device and the combustion chamber.

According to this configuration, the fuel supply control device can hardly receive the radiant heat from the combustion chamber, and can suppress the vaporization of the liquefied gas fuel in the fuel supply control device.

A heat insulating member may be disposed between the fuel supply control device and the combustion chamber.

According to this configuration, the fuel supply control device can hardly receive the radiant heat from the combustion chamber, and can suppress the vaporization of the liquefied gas fuel in the fuel supply control device.

The air layer portion may be disposed between the combustion chamber and the heat insulating member.

According to this configuration, the fuel supply control device can more difficultly receive the radiant heat from the combustion chamber, and can further suppress the vaporization of the liquefied gas fuel in the fuel supply control device.

The gas combustion type driving tool may include a fuel container accommodating portion that houses a fuel container filled with liquefied gas fuel, and the fuel container accommodating portion is disposed on the handle housing.

According to this configuration, the gas combustion type driving tool can be configured in a small size.

The fuel supply control device may be disposed above the fuel container accommodating portion.

According to this configuration, the gas combustion type driving tool is configured to be smaller, and the fuel supply control device is easily disposed in the vicinity of the combustion chamber.

The gas combustion type driving tool may include a gas pipe connecting the fuel container and the fuel supply control device, and the blocking wall is disposed between the fuel container accommodating portion accommodating the gas pipe and the combustion chamber.

According to this configuration, the heat of the combustion chamber is hardly transmitted to the fuel container accommodating portion, and the gasification of the liquefied gas fuel in the gas pipe can be suppressed.

A heat exhaust port that is also connectable to the outside is provided in the fuel container accommodating portion.

According to this configuration, the heat of the fuel container accommodating portion can be discharged outward, and the gasification of the liquefied gas fuel in the gas pipe can be further suppressed.

The gas-fired driving tool can also include a heat-conducting means for conducting heat generated in the combustion chamber to the fuel container receiving portion.

According to this configuration, by heating the fuel container filled with the liquefied gas fuel, the temperature difference between the fuel container and the fuel supply control device or the gas pipe can be made small. Therefore, it is difficult to generate a pressure change caused by the temperature difference, and it is possible to suppress the gasification of the liquefied gas fuel caused by the pressure change.

Alternatively, the gas supply piping system may be formed using a flexible member.

According to this configuration, the curved portion of the gas supply pipe can be made smooth, and the fuel can be quickly supplied by the difficulty in receiving the pipe resistance.

Other aspects and effects of the present invention will become apparent from the following description, drawings and claims.

An 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 of the present invention includes a main casing 11 for accommodating the striking cylinder 13 and a handle housing 12 which is connected to the rear side of the main casing 11. The striking piston 15 is slidably received in the striking cylinder 13. On the lower side of the striking piston 15, a striking nail is used as an example of a fixing member. The protruding portion 16 is attached to a lower portion of the main casing 11. An ejection opening 17 for guiding the nail to the driven member is formed in the protruding portion 16. The driver 14 is slidably received and guided into the ejection opening 17 of the projection 16. A magazine 18 loaded with a plurality of staples is attached to the rear side of the projection 16. The nails in the magazine 18 are sequentially supplied into the ejection opening 17 of the protruding portion 16, and are struck by the actuator 14, and then ejected from the ejection port 17 to the driven member.

The combustion chamber 19 is formed above the striking cylinder 13. In the combustion chamber 19, a mixed gas of combustible gas and air is generated, and the mixed gas is burned. The combustion chamber 19 is formed by a ring-shaped movable sliding sleeve 22. The movable sliding sleeve 22 is disposed between the upper end of the striking cylinder 13 and the upper wall 21 formed inside the upper casing 20. The upper end surface of the striking piston 15 is attached to the upper end of the striking cylinder 13 and is exposed to the mixed gas in the combustion chamber 19. The pressure of the combustion gas generated by burning the mixed gas in the combustion chamber 19 acts on the striking piston 15 to drive the striking piston 15 to the damper 23 disposed at the lower dead center position in the striking cylinder 13.

The movable sleeve 22 is configured to be slidable in the direction of movement of the striking piston 15. Before the trigger 10 is started, as shown in Fig. 1, the movable sleeve 22 is disposed at a lower position, and the passage 24 formed between the outer peripheral surface of the striking cylinder 13 and the inner peripheral surface of the main casing 11 communicates with the combustion chamber 19 . When the nail is driven by the gas burning type driving tool 10, as shown in Fig. 2, the movable sliding sleeve 22 is moved upward, and the inside of the combustion chamber 19 is blocked from the atmosphere. Further, an O-ring 25 for sealing the mixed gas in the combustion chamber 19 from leaking is provided at the upper end portion and the lower end portion of the movable sliding sleeve 22.

As shown in FIGS. 1 and 2, the link member 26 and the guide block 27 are slidably disposed in a space between the inner circumferential surface of the main casing 11 and the outer circumferential surface of the striking cylinder 13. The link member 26 pushes the guide block 27, and the upper end of the guide block 27 moves the movable sliding sleeve 22 upward, thereby sealing the inside of the combustion chamber 19. The lower end portion of the link member 26 is coupled to the upper end portion of the contact member 28. The contact member 28 is disposed to protrude toward the front end of the ejection opening 17 of the protruding portion 16. The contact member 28 is operated by the operation of pressing the protruding portion 16 against the driven member, and the movable sliding sleeve 22 is moved upward via the link member 26 and the guide block 27 to block the inside of the combustion chamber 19 from the atmosphere.

A supply port 29 for supplying combustible gas into the combustion chamber 19 is formed in the upper wall 21 of the combustion chamber 19. A connection portion 30 for mounting the gas supply pipe 31 is provided at the supply port 29. The supply port 29 is connected to the gas supply pipe 31 via the connection portion 30. The gas supply pipe 31 guides the gas fuel supplied from the fuel supply control device 32 to the combustion chamber 19. The fuel supply control device 32 supplies the gas fuel to the combustion chamber 19 via the gas supply pipe 31. The fuel supply control device 32 includes a valve that controls the amount of supply of gas fuel. In detail, the fuel supply control device 32 is connected to the fuel container 34 filled with the liquefied gas fuel via the gas pipe 33. The fuel supply control device 32 is configured such that the movable sliding sleeve 22 moves upward by abutting the protruding portion 16 and the driven member, and after the combustion chamber 19 is sealed, a fixed amount of the fuel container is supplied into the combustion chamber 19. The flammable gas supplied by the gas pipe 33 is 34.

The fuel container 34 is housed in the fuel container accommodating portion 42 of the handle case 12 as shown in Fig. 1 . The nozzle 44 is provided at an outflow port of the fuel container 34. The nozzle 44 is connected to a gas tube 33 which is a stainless steel tube. As shown in FIGS. 3 and 6 , the fuel container 34 is connected to the fuel supply control device 32 disposed above the fuel container accommodating portion 42 by the gas pipe 33 . The gas tube 33 is housed in the gas tube housing portion 43 provided in the handle housing 12.

The turning fan 35 is provided to the upper casing 20. The rotary fan 35 agitates the combustible gas supplied into the combustion chamber 19 with the air in the combustion chamber 19, and generates a mixed gas having a predetermined air-fuel ratio in the combustion chamber 19. The rotary fan 35 has blades that are radially arranged. The blades of the rotating fan 35 are rotated along the peripheral wall of the combustion chamber 19 by an electric motor (not shown) housed in the recess of the upper casing 20. The fan 35 is rotated to move the air in the combustion chamber 19 along the annular peripheral wall of the combustion chamber 19, and a flow of air in the circumferential direction is generated in the combustion chamber 19. When the rotary fan 35 moves the movable sleeve 22 upward, the switch 36 is turned on to start the rotation, and is driven and controlled by the control board 41 disposed inside the handle portion 12a.

Further, the ignition device 37 is provided in the upper casing 20. The ignition device 37 has a spark plug that boosts the voltage of the battery 38 attached to the rear end portion of the handle portion 12a to a high voltage, and generates a spark by discharging the high voltage. The ignition device 37 generates a high-pressure combustion gas in the combustion chamber 19 by generating a spark in the combustion chamber 19 that generates the mixed gas, igniting the mixed gas, and burning the mixed gas. The ignition device 37 is driven via the control circuit board 41 in accordance with the ignition switch 40 that operates by operating the trigger 39 provided at the base of the handle portion 12a.

In the present embodiment, as shown in Figs. 1 and 2, the combustion chamber 19 and the fuel supply control device 32 that supplies the gas fuel to the combustion chamber 19 are disposed adjacent to each other. Therefore, the distance from the fuel supply control device 32 to the fuel passage of the combustion chamber 19 is short, and the fuel can be quickly supplied, and the time to the point can be shortened.

The ceramic heat insulating member 47 is provided between the combustion chamber 19 and the fuel supply control device 32. Since the heat insulating member 47 is disposed between the main casing 11 so as to form a gap, the air layer portion 48 is formed between the fuel supply control device 32 and the combustion chamber 19. In this manner, since the air layer portion 48 is provided between the fuel supply control device 32 and the combustion chamber 19 in addition to the heat insulating member 47, although the fuel supply control device 32 is disposed adjacent to the combustion chamber 19, the fuel The supply control device 32 is difficult to receive the radiant heat from the combustion chamber 19, and suppresses the liquefied gas fuel from being vaporized in the fuel supply control device 32.

Further, as described above, the gas supply pipe 31 for guiding the gas fuel supplied from the fuel supply control 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 formed of a material having a lower thermal conductivity than the joint portion 30. For example, the connecting portion 30 is made of metal, and the gas supply pipe 31 is made of ruthenium rubber or fluororubber. Therefore, the heat supply of the combustion chamber 19 is conducted by the gas supply pipe 31 having a low thermal conductivity. Therefore, although the fuel supply control device 32 is disposed adjacent to the combustion chamber 19, the heat of the combustion chamber 19 is hardly conducted to the fuel supply control device 32 via the gas supply pipe 31, and the liquefied gas fuel is suppressed in the fuel supply control device 32. gasification.

When the gas supply pipe 31 is made of a flexible member made of ruthenium rubber or fluororubber, the bent portion can be made smooth. Therefore, the resistance of the pipe is suppressed, and the fuel can be supplied quickly. That is, 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, the blocking wall 45 for blocking the heat transfer is provided between the gas tube accommodating portion 43 for accommodating the gas tube 33 and the combustion chamber 19. The gas tube housing portion 43 is separated from the combustion chamber 19 by the blocking wall 45. Therefore, the heat of the combustion chamber 19 is hard to be conducted to the gas pipe 33, and the gas pipe 33 is suppressed from being heated and the liquefied gas fuel is vaporized in the gas pipe 33. Specifically, the air of the combustion chamber 19 passes through the passage 24 that communicates with the inside of the combustion chamber 19, and then is exhausted (discharged) from the discharge port 49 of the main casing 11. At that time, the air (heat) of the combustion chamber 19 also flows in the direction D toward the handle housing 12 as shown in Fig. 4B. However, as shown in FIG. 4B, since the blocking wall 45 blocks the flow of air (heat), the air (heat) does not flow into the gas tube accommodating portion 43 in which the gas tube 33 is housed.

The gas pipe 33 is extended in the vertical direction as indicated by the one-point chain line (PIPE) of Fig. 5. The air (heat) from the combustion chamber 19 flows in the direction toward the fuel container accommodating portion 42 along the gas pipe 33. In other words, the air (heat) from the combustion chamber 19 flows beside the gas tube housing portion 43 partitioned by the blocking wall 45. Therefore, although the blocking wall 45 is provided, the temperature inside the gas tube housing portion 43 cannot be prevented from rising slightly. Therefore, in the gas tube housing portion 43, as shown in Fig. 6 of the cross-sectional view of the gas tube 33, a heat discharge port 46 that communicates with the outside is formed. That is, although the gas tube accommodating portion 43 is formed by dividing the inner side of the main casing 11 by the blocking wall 45, a plurality of heat vents 46 are formed in the opening on the outer wall of the main casing 11 forming the gas tube accommodating portion 43. Therefore, the heat suffocating in the gas tube accommodating portion 43 can be discharged outward from the heat exhaust port 46, and the gasification of the liquefied gas fuel by the heating of the gas pipe 33 can be suppressed.

Further, the air (heat) from the combustion chamber 19 flows into the fuel container accommodating portion 42, and the fuel container 34 accommodated in the fuel container accommodating portion 42 is heated. That is, the air flow path acts as a heat conduction means for transmitting heat generated in the combustion chamber 19 to the fuel container accommodating portion 42. The heat transfer means heats the fuel container 34 by the heat generated in the combustion chamber 19, so that the temperature difference between the fuel container 34 and the fuel supply control device 32 and the gas pipe 33 located in the vicinity of the combustion chamber 19 becomes small, and the temperature difference is suppressed. The pressure changes and the liquefied gas fuel is vaporized.

As described above, according to the present embodiment, since the fuel supply control device 32 and the combustion chamber 19 are disposed adjacent to each other, the piping of the gas supply pipe 31 is short. Further, since the curved portion of the gas supply pipe 31 is small and the curved portion is smoothly formed, the pipe resistance of the gas supply pipe 31 is reduced. Therefore, the fuel can be quickly supplied to the combustion chamber 19, and the time to the point can be shortened.

Further, various means for suppressing vaporization of the liquefied gas fuel by the radiant heat of the combustion chamber 19 are included. Therefore, for example, the problem that the flow rate in the fuel supply control device 32 cannot be accurately adjusted due to gasification of the liquefied gas fuel can be avoided.

Further, in the above-described embodiment, the fuel supply control device 32 is provided in the handle housing 12, but the present invention is not limited thereto. For example, the fuel supply control device 32 may be disposed on the combustion chamber 19, and the fuel supply control may be performed. The device 32 is mounted outside the body housing 11 side.

Further, in the above embodiment, the gas pipe 33 is also provided in the handle casing 12, but the gas pipe 33 may be provided outside the handle casing 12, without being limited thereto. Further, in order to make it difficult for the gas tube 33 to receive radiant heat, the gas tube 33 itself may have a heat insulating effect, or may be covered with a heat insulating material such as a heat insulating tape to surround the gas tube 33.

Further, in the above-described embodiment, the air flow path from the combustion chamber 19 to the fuel container accommodating portion 42 is a heat conduction means for transmitting heat generated in the combustion chamber 19 to the fuel container accommodating portion 42, but the present invention is not limited thereto. . For example, a metal piece extending from the combustion chamber 19 to the fuel container accommodating portion 42 may be used as a heat transfer means, and the heat generated in the combustion chamber 19 may be conducted to the fuel container accommodating portion 42 by the metal piece.

10. . . Gas burning driving tool

11. . . Main housing

12. . . . . . Handle housing

12a. . . Handle section

13. . . Strike cylinder

14. . . driver

15. . . Strike piston

16. . . Protruding

17. . . Shot exit

18. . . Nail

19. . . Combustion chamber

20. . . Upper housing

twenty one. . . Upper wall

twenty two. . . Movable sliding sleeve

twenty three. . . buffer

twenty four. . . path

25. . . O ring

26. . . Link member

27. . . Guide block

28. . . Contact member

29. . . Supply port

30. . . Connection

31. . . Gas supply pipe

32. . . Fuel supply control device

33. . . Gas tube

34. . . Fuel container

35. . . Rotating fan

36. . . switch

37. . . Ignition device

38. . . battery

39. . . trigger

40. . . Ignition Switch

41. . . Control board

42. . . Fuel container containment unit

43. . . Gas pipe containment department

44. . . nozzle

45. . . Blocking wall

46. . . Heat exhaust

47. . . Insulation member

48. . . Air layer

49. . . Discharge

Figure 1 is a cross-sectional view of the gas-fired driving tool that presses the projection against the driven member.

Figure 2 is a cross-sectional view of the gas-fired driving tool with the projection pressed against the driven member.

Fig. 3 is an exploded partial enlarged view of the vicinity of the fuel supply control device.

Fig. 4A is a partially enlarged view of the vicinity of the trigger.

Figure 4B is a cross-sectional view taken along line A-A of Figure 4A.

Figure 5 is a partial enlarged view showing the position of the gas tube.

Figure 6 is a cross-sectional view along the gas tube (taken along the PIPE line of Figure 6).

10. . . Gas burning driving tool

11. . . Main housing

12. . . Handle housing

12a. . . Handle section

13. . . Strike cylinder

14. . . driver

15. . . Strike piston

16. . . Protruding

17. . . Shot exit

18. . . Nail

20. . . Upper housing

twenty one. . . Upper wall

twenty two. . . Movable sliding sleeve

twenty three. . . buffer

twenty four. . . path

25. . . O ring

26. . . Link member

27. . . Guide block

28. . . Contact member

29. . . Supply port

30. . . Connection

31. . . Gas supply pipe

32. . . Fuel supply control device

33. . . Gas tube

34. . . Fuel container

35. . . Rotating fan

37. . . Ignition device

38. . . battery

39. . . trigger

40. . . Ignition Switch

41. . . Control board

42. . . Fuel container containment unit

43. . . Gas pipe containment department

44. . . nozzle

45. . . Blocking wall

46. . . Heat exhaust

47. . . Insulation member

48. . . Air layer

49. . . Discharge

Claims (10)

A gas combustion type driving tool is driven into a fixing member by using a combustion pressure of a gas fuel, comprising: a combustion chamber for burning a gas fuel; and a fuel supply control device for controlling a supply amount of the gas fuel and burning the same The chamber supplies gas fuel; the gas supply pipe guides the gas fuel from the fuel supply control device to the combustion chamber; the fuel container storage portion houses the fuel container filled with the liquefied gas fuel; and a gas pipe connected to the fuel container The fuel supply control device is characterized in that the fuel supply control device is disposed adjacent to the combustion chamber, and the inside of the main casing is partitioned by a blocking wall to form a gas pipe accommodating portion for accommodating the gas pipe, and The hot air generated from the combustion chamber flows into the air flow path in the direction of the fuel container accommodating portion. A gas combustion type driving tool according to claim 1, wherein the combustion chamber comprises a joint portion to which the gas supply pipe is installed; and the gas supply pipe system is formed of a material having a lower thermal conductivity than the joint portion. A gas combustion type driving tool according to claim 1, wherein the air layer portion is disposed between the fuel supply control device and the combustion chamber. A gas combustion type driving tool according to claim 1, wherein the heat insulating member is disposed between the fuel supply control device and the combustion chamber. The gas combustion type driving tool of claim 3, wherein the heat insulating member is disposed between the fuel supply control device and the combustion chamber; the air layer portion is disposed between the combustion chamber and the heat insulating member . The gas combustion type driving tool of claim 1, wherein the fuel container accommodating portion is disposed in the handle housing. The gas combustion type driving tool of claim 6, wherein the fuel supply control device is disposed above the fuel container accommodating portion. The gas combustion type driving tool of claim 1, wherein the heat exhaust port communicating with the outside is disposed in the fuel container accommodating portion. The gas-fired driving tool of any one of claims 1 to 8, wherein the gas supply pipe is formed using a flexible member. A gas-fired driving tool according to claim 1, which comprises a heat-conducting means for transmitting heat generated in the combustion chamber to the fuel container accommodating portion.