JP2004291094A - Combustion type power tool - Google Patents

Abstract

A combustion type in which the remaining amount of gas in a gas cylinder can be easily grasped, the time when the gas in the gas cylinder runs out can be easily predicted, and it can be determined whether or not it is necessary to carry a spare gas cylinder in accordance with the scheduled work amount. Provision of power tools.
Kind Code: A1 A relationship between the mass of a gas cylinder, the remaining amount of liquefied gas, and the number of nails that can be driven is grasped in advance, and the mass is measured while the gas cylinder is housed in a gas cylinder chamber, and the gas cylinder chamber is measured. Is displayed so as to be visible. Information relating to the replacement time of the gas cylinder 14 and the number of remaining nails to be driven can be obtained. Whether the gas cylinder in use is sufficient for the scheduled work amount, whether it is better to replace it with a new unused gas cylinder, or whether a spare gas cylinder is better. You can decide whether it is better to bring your own.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a combustion-type power tool, and in particular, a gas nail for driving a piston to generate motive power by driving a piston by injecting liquefied gas sealed in a gas cylinder into a combustion chamber, mixing with air, and igniting. Regarding the punching machine.
[0002]
[Prior art]
Conventional gas nailing machines include a housing, a head cap, a combustion chamber frame, a push lever, a cylinder, a piston, a driver blade, a motor, a fan, a gas cylinder, a spark plug, and an exhaust check. It mainly has a valve, a magazine, and a tail cover. The head cap covers one end of the housing, and the combustion chamber frame is provided in the housing so as to be movable in the longitudinal direction of the housing, and one end is provided so as to be in contact with the head cap. The push lever is movably provided at the other end of the housing, and is connected to the combustion chamber frame. The cylinder is positioned so as to be communicable with the combustion chamber frame and is fixed to the housing. The cylinder guides the movement of the combustion chamber frame and has an exhaust hole. The piston is provided so as to be reciprocally slidable with respect to the cylinder. When one end of the combustion chamber frame comes into contact with the head cap, the piston defines a combustion chamber together with the head cap, the combustion chamber frame, and the end of the cylinder on the head cap side. The driver blade extends from the non-combustion chamber side of the piston toward the other end of the housing. The motor is supported by the head cap, and the fan is fixed to the motor and located in the combustion chamber. The gas cylinder is housed in the housing and contains liquefied gas injected into the combustion chamber through the gas passage of the head cap. The spark plug faces the combustion chamber and ignites a mixture of combustible gas and air. The exhaust check valve selectively shields the exhaust hole. The magazine is provided on the other end side of the housing and accommodates a fastener such as a nail. The tail cover is provided between the magazine and the push lever for feeding the stopper of the magazine to a position facing the driver bit.
[0003]
Liquefied gas is injected into the combustion chamber from a gas cylinder mounted on the housing, air and flammable gas are agitated and mixed by a fan, and the air-fuel mixture is explosively combusted by ignition from a spark plug, driving the piston and driving the piston through a driver blade. A nail is driven into a workpiece such as wood. (For example, see Patent Documents 1 to 5).
[Patent Document 1]
Japanese Patent Publication No. 1-34753 [Patent Document 2]
Japanese Patent Publication No. 4-48989 [Patent Document 3]
Japanese Patent Publication No. 3-25307 [Patent Document 4]
Japanese Patent Publication No. 4-11337 [Patent Document 5]
Japanese Patent Publication No. 64-9149
[Problems to be solved by the invention]
However, with such a conventional combustion type driving tool, the remaining amount of the liquefied gas in the gas cylinder cannot be grasped. In particular, when the gas cylinder is emptied in the middle of work at a high place, the work must be interrupted and the storage of the gas cylinder must be taken out, which has been a major factor in reducing work efficiency. Such problems can be solved by always carrying a spare gas cylinder while carrying it. However, since the gas cylinder is bulky, it is difficult to carry the gas cylinder, especially when working at a high place, and the efficiency of the operation is also reduced. It is needless to say that it is preferable not to wear it as much as possible because it is a liquefied gas.
[0005]
Therefore, the present invention makes it possible to easily grasp the remaining amount of gas in the gas cylinder, that is, to easily predict the time when the gas in the gas cylinder runs out, and determine whether or not it is necessary to carry a spare gas cylinder in accordance with the scheduled work amount. It is an object of the present invention to provide a combustion type power tool that can be used.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a first housing for accommodating a combustion chamber, a head portion closing one end of the first housing and defining a part of the combustion chamber, and a juxtaposition with the first housing. A second housing capable of accommodating a gas cylinder containing a liquefied gas, the head portion having a gas passage forming an injection port having one end selectively connected to the gas cylinder and the other end opening to the combustion chamber. In the formed combustion power tool, at least one of the second housing and the first housing is provided with a display unit for displaying information on the remaining amount of gas in the gas cylinder so as to be visible. Is provided.
[0007]
Here, the second housing is provided with a displacement unit that is displaced in accordance with the remaining amount of gas in the gas cylinder while suspending or loading the gas cylinder housed in the second housing, and the display unit includes: Information on the remaining amount of gas in the gas cylinder is displayed according to the displacement amount of the displacement portion.
[0008]
According to the combustion type power tool of the first embodiment, the second housing has an open end and a bottomed end at the other end, and a lid for closing the opening at the one end is provided to be openable and closable, A window frame formed in the second housing, a scale attached to the second housing adjacent to the window frame, an annular body fixed to an outer peripheral surface of the gas cylinder, and an outer peripheral surface of the annular body. The displacement portion is constituted by a compression spring interposed between the bottomed portion and the annular body, and when the lid is closed, the displacement portion is formed by the lid. The gas cylinder is displaced to a position where it can communicate with one end of the gas passage, and when the lid is opened, the gas cylinder moves due to the deformation of the compression spring, and the line moves with respect to the graduation, and the gas in the gas cylinder moves. Displays information about the remaining battery level.
[0009]
According to the combustion type power tool according to the second embodiment, the second housing has one end opened and the other end having a bottomed portion, and a lid for closing the opening at one end is provided so as to be openable and closable, A pedestal supporting the bottom of the gas cylinder, a rod member extending from the pedestal and penetrating the bottom, a compression spring interposed between the bottom and the pedestal, and a position below the bottom. And a leaf spring that abuts on the free end of the rod part and is deformed by the movement of the rod part. The display part is detected by the distortion sensor attached to the leaf spring and the distortion sensor. A display circuit that outputs an electric signal corresponding to the amount of deflection of the leaf spring; and an instruction unit that displays an output value output by the display circuit as information on the remaining amount of gas in the gas cylinder. When the gas cylinder is closed, the gas cylinder is When the lid is opened, the amount of deformation of the leaf spring changes according to the movement of the gas cylinder via the compression spring, and the remaining amount of gas in the gas cylinder is changed. The information about is displayed.
[0010]
According to the combustion type power tool of the third embodiment, the second housing has one end opened and the other end having a bottomed portion, and a lid for closing the opening at one end is provided so as to be openable and closable, A pedestal supporting the bottom of the gas cylinder, a rod member extending from the pedestal and penetrating the bottom, a compression spring interposed between the bottom and the pedestal, and a position below the bottom. And a leaf spring that abuts on a free end of the rod part and is deformed by movement of the rod part. The display unit is interposed between the leaf spring and the bottomed part, and the display spring is deformed. Capacitance changing means for changing the capacitance in accordance with the following conditions; a display circuit for outputting an electric signal in accordance with the capacitance value; and an output value output by the display circuit for determining the remaining gas in the gas cylinder. When the lid is closed. The gas cylinder is displaced by the lid to a position where the gas cylinder can communicate with one end of the gas passage, and when the lid is opened, the capacitance of the capacitance changing means changes according to the movement of the gas cylinder via the compression spring. Changes to display information on the remaining amount of gas in the gas cylinder.
[0011]
According to the combustion type power tool of the fourth embodiment, the second housing has one end open and the other end having a bottomed portion, and a lid for closing the opening at one end is provided so as to be openable and closable, A compression spring for urging the gas cylinder in the direction of the lid, and a plate extending from the lid, which is deformed in contact with the upper end of the gas cylinder energized by the compression spring when the lid is closed. A display circuit for outputting an electric signal corresponding to the amount of deflection of the leaf spring detected by the distortion sensor, the display section having a strain sensor attached to the leaf spring; And an instruction unit for displaying the output value obtained as information on the remaining amount of gas in the gas cylinder.
[0012]
According to the combustion type power tool of the fifth embodiment, the second housing has one end opened and the other end having a bottomed portion, and a lid for closing the opening at one end is provided so as to be openable and closable. A compression spring for urging the gas cylinder in the direction of the lid, and a plate extending from the lid, which is deformed in contact with the upper end of the gas cylinder energized by the compression spring when the lid is closed. A spring, wherein the display unit is interposed between the leaf spring and the lid and changes capacitance according to deformation of the leaf spring; And a display unit for displaying an output value output by the display circuit as information relating to the remaining amount of gas in the gas cylinder.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment in which a combustion type power tool according to the present invention is applied to a gas nailing machine will be described with reference to FIGS. The gas nailing machine 1 includes a housing 2 that forms an outer frame, the housing 2 includes a main housing portion 2A, and a cylinder chamber portion 2B that is arranged in parallel with the main housing 2A along the longitudinal direction of the main housing 2A. Having. An intake port (not shown) is formed at an upper portion of the main housing 2A, and an exhaust port 55 supporting a filter 54 is formed at a lower portion.
[0014]
A head cover 10 having a motor support 10A is attached to an upper part of the main housing 2A, and a storage lid 18 rotatable via a pin 60 is provided on an upper part of the cylinder chamber 2B at an upper end of the cylinder chamber 2B. The opening is openable and closable. A handle 26 having a trigger switch 25 is provided from the cylinder chamber 2B. Below the main housing 2A and the cylinder chamber 2B, a magazine 27 loaded with a nail (not shown) and a nail (not shown) are fed and guided. A tail cover 28 is provided for setting the position.
[0015]
At the lower end of the main housing 2A, the push lever 5 is movably supported corresponding to the nail setting position of the tail cover 28, and is connected to a connecting member 57 fixed to the combustion chamber frame 6 described later. When the tip of the push lever 5 contacts the workpiece and presses the entire housing 2 toward the workpiece, the upper part of the push lever 5 can be retracted into the main housing 2A.
[0016]
At the upper end of the main housing 2A, a head cap 4 as a head portion for closing the upper end opening is fixed, and the head cap 4 supports a motor 12 in which a fan 13 is fixed by a rotating shaft 12A, and a spark plug 16 is provided. It is stored and gripped. The motor 12 is configured to start rotating when the push lever 5 moves up to a predetermined position. In addition, an injection passage 34 serving as a fuel passage is formed in the cylinder chamber portion 2B side of the head cap 4, and one end of the injection passage 34 forms an injection port 15 opened at the lower end surface of the head cap 4, and the other end is described later. A gas cylinder connection part 32 connected to the gas cylinder 14 is formed. As shown in FIGS. 1 and 2, the gas cylinder connecting portion 32 has a groove 33 extending vertically downward a predetermined distance from the upper end surface of the head cap 4, and a bottom surface 33 </ b> A of the groove 33 communicates with one end of the injection passage 34. The groove wall portion 33B is formed as a tapered surface in which the distance between the walls gradually decreases from the outer peripheral surface of the head cap 4 toward the injection passage 34. A liquefied gas injection rod 31 of a gas cylinder 14 described later is provided so as to be inserted into the groove 33. Further, the head cap 4 is provided with a seal portion 52 for sealing between the head cap 4 and the combustion chamber frame 6 when an upper portion of the combustion chamber frame 6 described below comes into contact with the head cap 4.
[0017]
Inside the main housing 2A, there is provided a combustion chamber frame 6 which is movable in the longitudinal direction of the main housing 2A and whose upper end can contact the lower end surface of the head cap 4. The connecting member 57 described above is fixed to the lower end of the combustion chamber frame 6 and is connected to the push lever 5. The cylinder 3 that abuts on the inner peripheral surface of the combustion chamber frame 6 and guides the movement of the combustion chamber frame 6 is fixed to the main housing 2A, and is provided between the lower end surface of the cylinder 3 and the lower end of the connecting member 57. A compression coil spring 7 is interposed to urge the combustion chamber frame 6 toward the head cap 4. An exhaust hole 50 is formed near the lower portion of the cylinder 3 so as to communicate with the exhaust port 55 described above. A check valve (not shown) is provided so as to selectively close the exhaust hole 50. Further, a bumper 51 is provided at the bottom of the cylinder 3. A seal portion 53 is provided at the upper part of the cylinder 3 to seal between the lower inner peripheral surface of the combustion chamber frame 6 and the upper outer peripheral surface of the cylinder 3 when the combustion chamber frame 6 comes into contact with the head cap 4. Have been.
[0018]
A piston 9 is provided in the cylinder 3 so as to be reciprocally slidable with respect to the cylinder 3. When the upper end of the combustion chamber frame 6 contacts the head cap 4, the head cap 4, the combustion chamber frame 6, and the cylinder 3 The combustion chamber 11 is defined by the head cap part side end, the piston 9 and the seal parts 52 and 53. A plurality of ribs 3A extend in the longitudinal direction and protrude radially inward from a portion defining the combustion chamber 11 of the combustion chamber frame 6. The ribs 3 </ b> A, in combination with the rotation of the fan 13, promote the stirring and mixing of the air and the flammable gas in the combustion chamber 11. The above-described intake port (not shown) is formed for supplying air into the combustion chamber 11, and the exhaust hole 50 and the exhaust port 55 are formed for discharging combustion gas from the combustion chamber 11.
[0019]
A driver blade 8 is provided to extend from the side of the piston 9 opposite the combustion chamber 11 toward the lower end of the main housing 2A. The driver blade 8 is at a coaxial position where it can abut a nail in the tail cover 28, and when the piston 9 descends, the piston 9 hits the bumper 51 and stops.
[0020]
The fan 13, the spark plug 16, and the injection port 15 are all arranged or open in the combustion chamber 11. Due to the rotation of the fan 13, the air and the flammable gas are agitated and mixed when the combustion chamber frame 6 is in the contact position with the head cap 4, and turbulent combustion is generated after ignition to promote the combustion. When the frame 6 is separated from the head cap 4, it performs three functions of scavenging the combustion gas in the combustion chamber 11.
[0021]
The cylinder chamber 2B has a bottomed bottom wall 35, and a cylinder chamber 17 for accommodating the gas cylinder 14 is defined by the cylinder chamber 2B and the storage lid 18. A step portion 24 is formed at the lower end side of the cylinder chamber portion 2B, and a compression spring 23 as a displacement means is disposed on the step portion 24. A leaf spring 20 for pressing the gas cylinder 14 from above is integrally fixed to the storage lid 18.
[0022]
The gas cylinder 14 contains a combustible gas as a liquefied gas, and the head is provided with a cap 19 having the above-mentioned rod 31 for injecting a predetermined amount of the liquefied gas. An annular body 22 on which a line 22A is engraved is fixed to an outer peripheral surface near an upper portion of the gas cylinder 14. The above-described compression spring 23 is interposed between the step portion 24 and the annular body 21 to urge the gas cylinder 14 upward. Here, when the storage cover 18 is closed, the gas cylinder 14 moves downward against the urging force of the compression spring 23 and the rod 31 is in a positional relationship coaxial with the injection passage 34. Further, a cam (not shown) is provided in the housing 2 to rotate in conjunction with the vertical movement of the push lever 5 within a predetermined stroke range. The rotation of the cam causes the gas cylinder 17 to move and the tip of the rod 31 to be tapered. The liquefied gas in the gas cylinder 14 is injected into the injection passage 34 via the rod 31 by being pressed against the bottom surface 33A of the groove 33 of the head cap 4 while being guided by the nozzle 33.
[0023]
As shown in FIG. 3, a window frame 29 is formed in the cylinder chamber 2B near the annular body 22 when the gas cylinder 14 is stored in the cylinder chamber 17, and the window frame 29 is transparent. The cover is arranged and the cylinder chamber 17 is sealed. A scale 30 is stamped beside the window frame 29, a letter F indicating that the gas is full is located below the window frame 29, and gas is empty above the window frame 29. The letter E is carved. As will be described later, the scale 30 is stamped by grasping the mass of the gas cylinder 14 filled with the liquefied gas, the mass of the gas cylinder consuming the liquefied gas, and the floating amount of the gas cylinder 14 according to the amount of the liquefied gas used. Have been. Here, the line 22A, the window frame 29, and the scale 30 constitute display means.
[0024]
In the above configuration, in a non-operating state, the push lever 5 is urged downward by the urging force of the compression coil spring 7 and protrudes from the lower end of the tail cover 28. At this time, since the combustion chamber frame 6 is connected to the push lever 5 via the connecting member 57, the upper end of the combustion chamber frame 6 is separated from the head cap 4 and defines the combustion chamber 11 of the combustion chamber frame 6. The part and the upper end of the cylinder 3 are also spaced apart to provide a gap in each case. At this time, the piston 9 has stopped at the top dead center position in the cylinder 3.
[0025]
In this state, when the handle 26 is gripped and the push lever 5 is pressed against a workpiece such as wood, the push lever 5 rises against the urging force of the compression coil spring 7, and similarly, the combustion connected to the push lever 5 The chamber frame 6 also rises, the above-mentioned gap is closed, and the combustion chamber 11 is sealed by the seal portions 52 and 53. Then, when the push lever 5 is further pressed, a cam (not shown) presses the entire gas cylinder 14 against the bottom surface 33A of the groove 33 of the head cap 4, and the rod 31 hits the injection passage 34, and the liquefied gas in the gas cylinder 14 enters the combustion chamber 11. Is injected only once from the injection port 15 (FIG. 1). Further, the motor 12 is turned on and the fan 13 rotates. When the fan 13 rotates in the combustion chamber 11 which is a sealed space, the injected gas is stirred and mixed with the air in the combustion chamber 11 in combination with the rib 3A protruding into the combustion chamber 11.
[0026]
Thereafter, when the trigger switch 25 of the handle 26 is turned ON, the spark plug 16 sparks and ignites the mixed gas. At this time, since the fan 13 keeps rotating, turbulent combustion of the air-fuel mixture is promoted, and the output of the power tool is improved. The burned and expanded gas moves the piston 9 downward, and the nail in the tail cover 28 is driven into the workpiece through the driver blade 8 until the piston 9 abuts the bumper 7.
[0027]
When the piston 9 passes through the exhaust hole 50, a check valve (not shown) is urged by the pressure of the combustion gas to open the exhaust hole 50, and the combustion gas is discharged to the outside of the cylinder 3 and is discharged through the filter 54 to the exhaust port 55. Is discharged to the outside. Then, when the combustion gas is released to the outside of the cylinder 3 and the pressure in the cylinder 3 and the inside of the combustion chamber 11 becomes atmospheric pressure, the check valve is closed. The combustion gas remaining inside the cylinder 3 and the combustion chamber 11 has a high temperature because it has been burned, and the heat is absorbed from the inner wall of the cylinder 3 and the inner wall of the combustion chamber frame 6 to rapidly cool the combustion gas. Then, the pressure in the closed space above the piston 9 decreases and becomes lower than the atmospheric pressure (referred to as thermal vacuum). Accordingly, the piston 9 is returned to the initial top dead center position due to the pressure difference between the pressure in the cylinder 3 on the driver blade 8 side and the internal pressure on the combustion chamber 11 side.
[0028]
Thereafter, when the trigger switch 25 is turned off to lift the entire tool from the workpiece and release the push lever 5 from the wood, the push lever 5 and the combustion chamber frame 6 return downward by the urging force of the compression coil spring 7, and the above-described operation is performed. A gap is provided again. Even if the trigger 25 is turned off, the fan 13 continues to rotate for a certain period of time, so that new air is taken in from the intake port of the housing through the above-mentioned gap, and the air after combustion is discharged from the housing exhaust port 55. As a result, the air in the combustion chamber 11 is scavenged. After that, the fan 13 stops and enters an initial stationary state.
[0029]
Here, in order to know the remaining amount of the liquefied gas, the gas nailer 1 is held with the push lever 5 down, and when the storage lid 18 is opened as shown in FIG. 3, the upper end of the gas cylinder 14 is opened. Therefore, the gas cylinder 14 is displaced upward via the annular body 22 by the urging force of the compression spring 23. At this time, the mass of the gas cylinder 14 is naturally determined by the remaining amount of the liquefied gas. For example, if the amount of liquefied gas used is large, the gas becomes lighter and the gas cylinder 14 moves upward. Since the scale 30 is marked in advance by grasping the mass and the lift amount, the remaining gas amount can be read from the window frame 29 at the position indicated on the scale 30 indicated by the line 22A of the annular body 22. At this time, if the number of shots when the gas is full is known, it can be inferred from the current remaining amount how many more shots can be shot. After the reading, the storage lid 18 is closed, and the operation is continued.
[0030]
4 and 5 show a gas nailing machine 101 according to a second embodiment of the present invention, in particular, a cylinder chamber 102B. Members similar to those shown in FIGS. 1 to 3 are denoted by the same reference numerals and description thereof is omitted. . A bottom wall 35 is provided in the cylinder chamber 102B, and a through hole 38 is formed in the bottom wall 35. As in the first embodiment, a storage lid 18 that opens and closes the upper end of the cylinder chamber 102B is provided so as to be openable and closable. In addition, a displacement unit is provided which is displaced according to the remaining amount of gas in the gas cylinder 14 while suspending the gas cylinder 14 housed in the cylinder chamber 117.
[0031]
The displacement portion includes a pedestal 36 that supports the bottom of the gas cylinder 14, a rod member 37 that extends from the pedestal 36 and slidably passes through a through hole 38 of the bottom wall 35, and an interposition between the bottom wall 35 and the pedestal 36. And a leaf spring 40 located below the bottom wall 35 and in contact with the free end of the rod member 37 and deformed by the movement of the rod member 37.
[0032]
Further, display means is provided for displaying information on the remaining amount of gas in the gas cylinder 14 according to the displacement amount of the leaf spring 40 of the displacement portion. The display means includes a distortion sensor 41 attached to the leaf spring 40 for detecting the amount of deflection of the leaf spring 40, and a display circuit for outputting an electric signal corresponding to the amount of deflection of the leaf spring detected by the distortion sensor 41. And an indicator 48 for displaying the output value output by the display circuit 70 as information on the remaining amount of gas in the gas cylinder 14.
[0033]
The display circuit 70 includes a bridge power supply 71, a converter 72 connected to the bridge power supply 71, and an amplifier 73 connected between the converter 72 and the indicator 48. The bridge power supply 71 supplies a constant voltage between the A terminal 72A and the B terminal 72B of the converter 72. The strain sensor 41 is incorporated in the converter 72, and the resistance value of the strain sensor 41 changes according to the amount of deflection of the leaf spring 40. When the resistance value of the strain sensor 41 changes, the balance of the converter 72 is lost, and a voltage is generated between the output terminals 72C and 72D. This voltage is amplified by the amplifier 73 and displayed by the indicator 48. The position of the pointer of the indicator 48 changes according to the output voltage value. The distance between the FEs is determined in advance by grasping in advance the relationship between the mass of the gas cylinder 14 and the amount of distortion of the leaf spring 40.
[0034]
When the storage lid 18 is closed, the gas cylinder 14 is displaced by the storage lid 18 to a position where the gas cylinder 14 can communicate with one end of the gas passage 34, as in the first embodiment. Then, when the storage lid 18 is opened, the amount of deformation of the leaf spring 40 changes according to the movement of the gas cylinder 14 via the compression spring 39, and information on the remaining amount of gas in the gas cylinder 14 is displayed.
[0035]
6 and 7 show a gas nailer 201 according to a third embodiment of the present invention. This gas nailing machine 201 is provided with capacitance changing means instead of the strain sensor 41 in the second embodiment. The capacitance changing means includes a metal plate 42 attached to a leaf spring 40, a metal sheet 43 fixed to the bottom surface of the bottom wall 35, and an insulating material 44 embedded between the metal plate 42 and the metal sheet 43. And The metal plate 42 and the metal sheet 43 are electrically insulated from each other, and a voltage is applied between them to generate capacitance. And a display circuit 80 for outputting an electric signal corresponding to the capacitance of the capacitance changing means, and an indicator (liquid crystal display) for displaying the output value output by the display circuit 80 as information on the remaining amount of gas in the gas cylinder 14. Plate) 49 is provided.
[0036]
FIG. 7 is a principle diagram of the display circuit 80. In this drawing, the metal sheet 43, the insulating material 44, and the metal plate 42 are regarded as one capacitor 81. When the capacitance of the capacitor 81 changes, the terminal voltage VC of the capacitor 81 connected to the high-frequency power supply 83 via the resistor changes, and this terminal voltage VC is displayed by the indicator 49 so that the residual gas in the gas cylinder 14 can be changed. I know the amount.
[0037]
When the storage lid 18 is closed, the gas cylinder 14 is displaced by the storage lid 18 to a position where it can communicate with one end of the gas passage 34. When the storage lid 18 is opened, the leaf spring 40 is deformed according to the movement of the gas cylinder 14 via the compression spring 39. Here, when the amount of gas in the gas cylinder 14 is sufficient, the leaf spring 40 is greatly deformed, and the metal plate 42 moves in a direction away from the metal sheet 43, so that the capacitance is reduced. On the other hand, when the remaining amount of gas in the gas cylinder 14 decreases, the amount of deflection of the leaf spring 40 decreases, the metal plate 42 moves toward the metal sheet 43, and the capacitance increases. Information about the remaining gas amount according to the capacitance is displayed on the liquid crystal panel 49 via the display circuit 80.
[0038]
FIG. 8 shows a gas nailer 301 according to a fourth embodiment of the present invention. In the gas nailing machine according to the first to third embodiments, when the storage lid 18 is opened, the remaining amount of gas in the gas cylinder 14 is detected and displayed. When the storage lid 18 is closed, the remaining amount of gas in the gas cylinder 14 is detected and displayed. As in the first embodiment, a gas cylinder 14 is loaded in the gas cylinder chamber 17, and a displacement unit that is displaced according to the remaining amount of gas in the gas cylinder 14 is provided. The displacement portion includes a compression spring 23 for urging the gas cylinder 14 toward the storage lid 18, and a storage lid that is deformed by contacting the upper end of the gas cylinder urged by the compression spring when the storage lid 18 is closed. And a leaf spring 20 extending therefrom. As in the first embodiment, an annular body 22 (FIG. 1) is fixed to the outer periphery of the gas cylinder 14, and one end of a compression spring 23 urges the annular body upward.
[0039]
The display unit includes a strain sensor 41 attached to the leaf spring 20, a display circuit similar to FIG. 5 that outputs an electric signal corresponding to the amount of deflection of the leaf spring 20 detected by the strain sensor 41, and a display circuit. An instruction unit 89 for displaying the output value as information on the remaining amount of gas in the gas cylinder.
[0040]
When the liquefied gas is not used much, the gas cylinder 14 is heavy and the compression spring 23 is largely bent. In this state, a small force is required to close the storage lid 18 until the rod 31 of the gas cylinder 14 abuts against the bottom surface 33A of the groove 33 of the head cover 4, and the amount of deflection of the leaf spring 20 at that time is small. Conversely, when a large amount of liquefied gas is consumed, the gas cylinder 14 becomes lighter, the compression spring 23 does not slacken excessively, a large force is required to close the storage lid 18, and the deflection amount of the leaf spring 20 also increases. . As in the second embodiment, the remaining gas amount corresponding to the amount of deflection of the leaf spring 20 is displayed on the instruction unit 89 via the strain sensor 41 and the display circuit 70 (FIG. 5).
[0041]
FIG. 9 shows a gas nailing machine 401 according to a fifth embodiment of the present invention. The gas nailer according to the present embodiment is similar to the fourth embodiment in that the remaining amount of gas in the gas cylinder 14 is detected and displayed when the storage lid 18 is closed. It is similar to the third embodiment in that it is used. The capacitance changing means of the present embodiment includes a metal plate 45 attached to the leaf spring 20, a non-deformable high-rigidity metal board 46 extending from the storage lid 18 substantially parallel to the metal plate 45, 45 and an insulating material 44 embedded between the metal boards 46. Then, a display circuit (FIG. 7) similar to that of the third embodiment is used, which is connected to a liquid crystal display 99 for displaying the remaining number of shots. Further, as in the fourth embodiment, an unillustrated compression spring (corresponding to the compression spring 23 in FIG. 8) for urging the gas cylinder toward the storage lid 18 is provided.
[0042]
When the liquefied gas is not used much, the gas cylinder 14 is heavy and the compression spring is largely bent. In this state, a small force is required to close the storage lid 18 until the rod 31 of the gas cylinder 14 abuts against the bottom surface 33A of the groove 33 of the head cover 4, and the amount of deflection of the leaf spring 20 at that time is small. Therefore, the distance between the metal plate 45 and the metal board 46 is small, and the capacitance value is large. On the other hand, when the liquefied gas is consumed in a large amount, the gas cylinder 14 becomes lighter, the compression spring 23 does not slacken excessively, a large force is required to close the storage cover 18, and the amount of deflection of the leaf spring 20 increases. Accordingly, the distance between the metal plate 45 and the metal board 46 increases, and the capacitance value decreases. Such a change is displayed on the liquid crystal display 99 via a display circuit similar to that of the third embodiment.
[0043]
The combustion type power tool according to the present invention is not limited to the embodiment described above, and various modifications and improvements can be made within the scope described in the claims. For example, if the remaining amount of gas in the gas cylinder 14 or the replacement time is known, the display content can be various modes such as a display of the amount of liquefied gas used, the number of nails driven, or the number of remaining nails that can be driven. . The display portion is not limited to the cylinder chamber 2B itself as long as it constitutes the main body, and is displayed on a handle integrated with the cylinder chamber 2B, or on a main cylinder 2A or a gas cylinder visible through the cylinder chamber 2B. Is also good.
[0044]
【The invention's effect】
According to the combustion-type power tool of the first aspect, the display unit for displaying information on the remaining amount of gas in the gas cylinder is provided on at least one of the second housing and the first housing so that the tool itself can be seen. The remaining amount of gas can be grasped, and information related to the number of tool operations such as the number of remaining nails can be obtained in advance, and it is known in advance whether or not a spare gas cylinder is necessary according to the work amount. It is possible to avoid problems such as interruption of work due to unexpected running out of fuel. In other words, whether the gas cylinder in use is sufficient for the scheduled work volume, whether it is better to replace it with a new unused gas cylinder, or whether it is better to bring a spare gas cylinder is better. This can be performed without using a gas remaining amount detection indicator separately.
[0045]
According to the combustion type power tool according to claims 2 to 7, a displacement portion which is displaced in accordance with the remaining amount of gas is provided, and the display portion displays information regarding the remaining amount of gas in the gas cylinder in accordance with the displacement amount of the displacement portion. Since the information is displayed, the information regarding the remaining gas amount can be easily displayed by grasping the displacement amount of the displacement portion mechanically or electrically.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a first embodiment in which a combustion type power tool of the present invention is applied to a gas driving machine.
FIG. 2 is an explanatory diagram showing a positional relationship between a gas cylinder connection portion of a head cover and an injection rod of the gas cylinder in the first embodiment.
FIG. 3 is a partial cross-sectional view showing a gas chamber and a gas chamber of the gas driving machine according to the first embodiment.
FIG. 4 is a partial sectional view showing a gas chamber and a gas chamber of a gas driving machine according to a second embodiment of the present invention.
FIG. 5 is a block diagram showing a display circuit in the gas driving machine according to the second embodiment.
FIG. 6 is a partial cross-sectional view showing a gas chamber and a gas chamber of a gas driving machine according to a third embodiment of the present invention.
FIG. 7 is a circuit principle diagram showing a display circuit in a gas driving machine according to a third embodiment.
FIG. 8 is a partial sectional view showing a gas chamber and a gas chamber of a gas driving machine according to a fourth embodiment of the present invention.
FIG. 9 is a partial cross-sectional view showing a gas chamber and a part of a gas cylinder of a gas driving machine according to a fifth embodiment of the present invention.
[Explanation of symbols]
Reference numerals 1, 101, 201, 301, 401: gas injector, 2: housing, 2A: main housing, 2B, 102B: cylinder chamber, 4: head cap, 11: combustion chamber, 14: gas cylinder, 17: cylinder chamber 18: storage cover, 20: leaf spring, 22: annular body, 22A: line, 23: compression spring, 26: handle, 29: window frame, 30: scale, 31: injection rod, 34: injection passage, 35: Bottom wall, 36: pedestal, 37: rod member, 40: leaf spring, 41: strain sensor, 42: metal plate, 43: metal sheet, 44: insulating material, 45: metal plate, 46: metal board, 48: instruction 49: liquid crystal plate, 70, 80: display circuit, 89: display section, 99: liquid crystal display

Claims (7)

A first housing containing a combustion chamber;
A head portion that closes one end of the first housing and defines a part of the combustion chamber;
A second housing that is provided in parallel with the first housing and that can accommodate a gas cylinder containing a liquefied gas;
In the combustion type power tool, one end of the head portion is selectively connected to a gas cylinder and the other end is formed with a gas passage forming an injection port opening to the combustion chamber.
A combustion-type power tool, wherein at least one of the second housing and the first housing is provided with a display section for displaying information on a remaining amount of gas in the gas cylinder so as to be visually recognized. The second housing is provided with a displacement portion which is displaced in accordance with the remaining amount of gas in the gas cylinder while suspending or loading the gas cylinder accommodated in the second housing, and the display portion is provided with the displacement portion. The combustion type power tool according to claim 1, wherein information on the remaining amount of gas in the gas cylinder is displayed according to the displacement amount of the gas cylinder. The second housing has an opening at one end and a bottomed portion at the other end, and a lid for closing the opening at the one end is provided to be openable and closable,
The display unit includes a window frame formed in the second housing, a scale attached to the second housing adjacent to the window frame, an annular body fixed to an outer peripheral surface of the gas cylinder, and the annular body. And a line attached to the outer peripheral surface of
The displacement portion is configured by a compression spring interposed between the bottomed portion and the annular body,
When the lid is closed, the lid displaces the gas cylinder to a position where it can communicate with one end of the gas passage,
3. The gas cylinder moves due to deformation of the compression spring when the lid is opened, and the line moves with respect to the scale to display information on the remaining amount of gas in the gas cylinder. The combustion type power tool as described. The second housing has an opening at one end and a bottomed portion at the other end, and a lid for closing the opening at the one end is provided to be openable and closable,
The displacement portion includes a pedestal supporting the bottom of the gas cylinder, a rod member extending from the pedestal and penetrating the bottomed portion, a compression spring interposed between the bottomed portion and the pedestal, A leaf spring that is located below and is in contact with the free end of the rod portion and is deformed by movement of the rod portion;
The display unit includes a strain sensor attached to the leaf spring, a display circuit that outputs an electric signal corresponding to the amount of deflection of the leaf spring detected by the strain sensor, and an output value output by the display circuit. An instruction unit for displaying information on the remaining amount of gas in the gas cylinder,
When the lid is closed, the lid displaces the gas cylinder to a position where it can communicate with one end of the gas passage,
When the lid is opened, the amount of deformation of the leaf spring changes in accordance with the movement of the gas cylinder via the compression spring, and information regarding the remaining amount of gas in the gas cylinder is displayed. 2. The combustion-type power tool according to 2. The second housing has an opening at one end and a bottomed portion at the other end, and a lid for closing the opening at the one end is provided to be openable and closable,
The displacement portion includes a pedestal supporting the bottom of the gas cylinder, a rod member extending from the pedestal and penetrating the bottomed portion, a compression spring interposed between the bottomed portion and the pedestal, A leaf spring that is located below and is in contact with the free end of the rod portion and is deformed by movement of the rod portion;
The display unit is interposed between the leaf spring and the bottomed part, and changes capacitance according to deformation of the leaf spring; and a capacitance changing unit that outputs an electric signal corresponding to the capacitance value. A display circuit for outputting, and an instruction unit for displaying the output value output by the display circuit as information on the remaining amount of gas in the gas cylinder,
When the lid is closed, the lid displaces the gas cylinder to a position where it can communicate with one end of the gas passage,
When the lid is opened, the capacitance of the capacitance changing means changes in accordance with the movement of the gas cylinder via the compression spring, and information on the remaining amount of gas in the gas cylinder is displayed. The combustion type power tool according to claim 2, wherein The second housing has an opening at one end and a bottomed portion at the other end, and a lid for closing the opening at the one end is provided to be openable and closable,
The displacement portion includes a compression spring for urging the gas cylinder in the lid direction, and a lid that is deformed by being brought into contact with an upper end of the gas cylinder urged by the compression spring when the lid is closed. Having an extended leaf spring,
The display unit includes a strain sensor attached to the leaf spring, a display circuit that outputs an electric signal corresponding to the amount of deflection of the leaf spring detected by the strain sensor, and an output value output by the display circuit. 3. The combustion type power tool according to claim 2, further comprising an instruction unit for displaying information on a remaining amount of gas in the gas cylinder. The second housing has an opening at one end and a bottomed portion at the other end, and a lid for closing the opening at the one end is provided to be openable and closable,
The displacement portion includes a compression spring for urging the gas cylinder in the lid direction, and a lid that is deformed by being brought into contact with an upper end of the gas cylinder urged by the compression spring when the lid is closed. Having an extended leaf spring,
The display unit is interposed between the leaf spring and the lid, and changes capacitance according to the deformation of the leaf spring. 3. The combustion type motive power according to claim 2, comprising: a display circuit for outputting; and an instruction unit for displaying an output value output by the display circuit as information on a remaining amount of gas in the gas cylinder. tool.

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