JP2008200828A - Gas combustion hammering tool - Google Patents

Abstract

The present invention provides an AC power supply type gas-fired driving tool that does not cause damage to an adapter and that can be easily repaired and replaced.
The tool includes a front housing 26 extending downward from the head portion 4, and a housing portion for the adapter 30 is formed in the front housing 26. The storage portion 37 is opened downward, and the adapter 30 is held in the storage portion 37 so as not to drop off when the engagement claw 44 is fitted into the engagement hole 40. Since the adapter 30 is built in the front housing 26, there is no possibility that the adapter 30 will hit and be damaged. In addition, the adapter 30 can be easily repaired or replaced.
[Selection] Figure 4

Description

  The present invention relates to a gas combustion type driving tool using a gas containing a cylinder as a power source.

  Portable (hand-held) fastener driving tools such as nailing machines and pinning machines (nailing machines) are roughly classified into pneumatic (pneumatic), explosive and gas types from the viewpoint of the power source. Among these, the gas type is superior to the air type in that it does not require a compressor and is excellent in maneuverability, and has no advantage in workability because a hose is unnecessary. In addition, compared with the explosive type, the labor required for management is remarkably reduced, and there are advantages in that workability is excellent because a number of fasteners can be connected.

On the other hand, the characteristic of the gas combustion type driving tool is that it has electrical parts such as a spark plug for igniting gas and a cooling fan for the combustion chamber, and therefore a power source (for example, a 6V DC power source) is required. It is. A battery is generally used as the power source, but the applicant of the present application proposed in Patent Document 1 to draw in an external AC power source with a corded adapter.
JP-A-8-290370

  According to Japanese Patent Laid-Open No. 2005-288607, there is an advantage that a continuous driving operation can be performed without worrying about battery consumption. Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. 2005-288607, a fastener is fed by a motor. It can be said that it is also suitable in some cases.

  By the way, the driving tool is equipped with a safety device so that the fastener cannot be driven out unless the tip nose is pressed against the workpiece regardless of the type of power source. In order to prevent the tool from being used as a weapon, safety devices are extremely strictly regulated, and possession permission is required for a safety device that is easy for a person to unlock.

  For this reason, the regulation is cleared by enhancing the safety function by covering the tip (head part) with a cover, etc., but for example, a fastener is driven into a narrow place such as a grooved part or a corner. In some cases, it may be difficult to work with a cover.

  Therefore, if an external power supply is incorporated with a cord as in Patent Document 1, the workable range becomes the same as that of the pneumatic tool, so it is not subject to the regulation of the sword method, and no possession permission is required. There is also an advantage that the versatility of the combustion type driving tool can be enhanced.

  The present invention is intended to provide a gas combustion type driving tool that is more improved while following Patent Document 1 in that an external power source is used.

  The gas combustion type driving tool of the present invention is basically the same as the conventional one, a piston provided with a fastener driving rod, a cylinder in which the piston is slidably inserted, and a grip that can be grasped by a hand. And a head part that guides the forward and backward movement of the rod, a magazine that feeds fasteners one by one in front of the retracted rod, and an external appearance of the part that covers the cylinder and excludes the grip, the head part, and the magazine. And a housing constituting the same. The piston is driven by the combustion pressure of the gas filled in the cylinder. For this reason, at least a spark plug is provided as an electrical component, and a power supply unit that supplies a DC power to the electrical component. Is provided.

  In the invention of claim 1, as a feature, the power supply unit is an adapter with a cord for stepping down and rectifying an external AC power supply, and the adapter is in a state where most or all of the adapter is concealed. Or it is built in a magazine or a grip.

  According to a second aspect of the present invention, in the first aspect of the present invention, the housing, the magazine, or the grip is provided with a storage portion in which the adapter can be removably attached. Further, the invention of claim 3 is that in claim 2, a battery having the same or almost the same form as the adapter can be attached to the storage portion.

  Patent Document 1 discloses that the adapter is connected to an external power source such as an outlet. However, since the adapter is larger than the plug, depending on the situation of the work site, a person may accidentally kick the object. May cause damage to the adapter, and a large and heavy adapter may be connected to the tip of the cord, which may make it difficult to process the cord after work.

  In contrast, in the present invention, since the adapter is built in the tool, there is no damage accident caused by a person kicking with a foot or hitting an object, and a plug is connected to the end of the cord. Therefore, there is no hassle of processing the code after work.

  According to the second aspect of the present invention, since the adapter is detachable, there is an advantage that repair and replacement in the event of failure can be performed very easily. Also, remove the adapter, for example, wrap the cord around the adapter and store it in the tool case, or prepare multiple types of adapters with different cord lengths and use them according to the situation at the site This is possible and is especially useful for this.

  If the structure of Claim 3 is employ | adopted, since one type of tool can be combined with a battery specification and an adapter specification, it can contribute to a cost reduction and resource saving as a whole. In this case, when the safety device clears the regulations under the sword law and when there is no regulation itself (when it is abolished), the battery and the adapter can be used properly according to the application.

  On the other hand, if there is a restriction on the safety device, install a safety device that meets the requirements for battery specifications, and if the safety device does not meet the restrictions, set the adapter output voltage as a dedicated product for the adapter specification. Measures such as making the battery unusable by making it higher than the voltage of the battery (when changing the voltage between the adapter specification and the battery specification, by changing the rated voltage of electric parts such as spark plugs, It is preferable to eliminate compatibility between the adapter specification and the battery specification.)

  Next, an embodiment of the present invention will be described with reference to the drawings. The embodiment of the present application is applied to a gas combustion type driving tool (hereinafter simply referred to as “tool”) used for driving a finish nail used for fastening interior members in a finishing process of an interior of a building. In the following embodiments, left / right / front / rear words are used, which is based on the direction in which the user faces as a front view. In addition, the upper and lower words are based on the posture in which the user holds the tool while performing the fastening work to the wall.

(1). Overall Outline First, the overall outline will be described with reference to FIGS. 1A is a left side view of the entire tool, FIG. 2B is a partial side view, FIG. 2 is a partial side sectional view of a drive unit, and FIG. 3 is a front-rear posture of FIG. FIG. 5 is a cross-sectional view taken along the line III-III in a state in which is reversed, and is a cross-sectional view taken along the line III-III in FIG.

  As shown in FIG. 1, the tool includes a cylinder 2 in which a piston 1 is slidably inserted, a body 3 that covers a drive unit that includes the cylinder 2, a head portion 4 that is provided at the front end of the body 3, A grip 5 provided integrally on the lower surface of the body 3 and a magazine 6 provided so as to extend downward from the head portion 4 are provided. The piston 1 is provided with a driving rod (hammer blade) 7. A trigger 5 a is provided on the top of the grip 5.

  The body 3 constitutes a part of the housing described in the claims, and as a whole, the body 3 has a square shape and is gradually narrowed toward the front, and the foremost portion to which the head portion 4 is attached is considerably large in plan view. It is narrow. Exhaust holes 8 are open near the front end of the body 3 and on the left and right side portions. On the other hand, a gas cylinder storage chamber 9 having a lateral width slightly larger than that of the grip 5 and opened rearward is formed in the rear portion and the lower surface portion of the body 3. ) Is filled.

  As shown in FIG. 2, a combustion chamber 10 is formed behind the cylinder 2, and a fan 11 having a cooling / stirring function and a spark plug 12 face the combustion chamber 10 from behind. Further, the rear part of the cylinder 2 is surrounded by a sleeve 13, and when the sleeve 13 is retracted, the combustion chamber 10 is sealed and fuel gas is supplied to the inside. Accordingly, the sleeve 13 constitutes a part of the safety device, and is moved backward by the interlocking member 14 disposed between the cylinder 2 and the body 3. Reference numeral 15 shown in FIG. 2 is a cushioning material that absorbs an impact when the piston 1 moves forward.

  The head unit 4 includes a lower guide body 17 fixed to the body 3, an upper guide body 18 overlapping the upper surface of the lower guide body 17, and a contact nose 19 disposed in front of the upper and lower guide bodies 17, 18. ing. The contact nose 19 is fixed to the front end of a round bar probe 20 that is slidable back and forth on the mating surfaces of the upper and lower guide bodies 17 and 18.

  The probe 20 and the contact nose 19 constitute a part of the safety device together with the sleeve 13 and the interlocking member 14, and when the contact nose 19 is pressed against the workpiece W, the probe 20 relatively moves backward. The sleeve 13 is moved backward relative to the cylinder 2 via the interlocking member 14, and the safety device is unlocked (the rod 7 moves forward when the trigger 5a is pulled). The probe 20 is biased by a spring (not shown) in the forward direction.

  Further, the upper guide body 18 is connected to the lower guide body 17 in a state where the upper guide body 18 can be swung up and rotated around the rear portion, and the upper guide body 18 is lifted up by being overlapped with the lower guide body 17 by the clip body 21 and the lever 22. It can be switched to the state (open state). Further, the rod 7 slides in the front-rear direction inside the driving path formed on the mating surfaces of the upper and lower guide bodies 17 and 18. In addition, since the example of the specific structure of the head part 4 is disclosed by Unexamined-Japanese-Patent No. 2006-315116 based on the prior application of the applicant of this application, please refer if necessary.

  The magazine 6 includes a main body 23 having a guide groove 23a that opens sideways (leftward as viewed from the operator), and a cover 24 that is slidably mounted on the main body 23. This tool uses a connecting nail N in which a large number of nails (finish nails) n are connected in parallel, but the connecting nail N has a plate-like shape as a whole, and the main body 23 In the guide groove 23a.

  The cover 24 constituting the magazine 6 has a length and a width so as to entirely block the guide groove 23a of the main body 23, and the connecting nail N moves upward in a space formed between the bottom surface of the guide groove 23a and the cover 24. Arranged to be possible. A plate-like pusher 25 that pushes the connecting nail N upward is arranged on the cover 24 so as to be movable up and down, and the pusher 25 is built in a hollow portion 25 formed in the cover 24. It is pushed upward by a spring (not shown).

  The connecting nail N pushed by the pusher 25 is pushed toward the driving path through a guide hole formed in the lower guide body 17 of the head portion 4. The nail n of the book is exposed to the driving passage, and this is driven out by the forward movement of the rod 7.

  The magazine 6 is mounted on a vertically long front housing 26 that is continuous with the front end of the body 3, and the lower end of the front housing 26 and the grip 5 are integrally connected via a hollow joint portion 27. A lever 28 for locking / unlocking the cover 24 of the magazine 6 is provided at the lower end of the joint portion 27. The nail n is an example of a fastener described in the claims, but the specific structure of the magazine 6 varies depending on the form of the fastener (or connecting fastener). In the present embodiment, the joint portion also constitutes a part of the housing described in the claims.

(2). Adapter and its mounting structure Next, the power adapter and its mounting structure will be described with reference to FIG. 4A is a right side view of the tool with the adapter 30 separated, FIG. 4B is a partial right side view with the adapter 30 attached, and FIG. 5 is the adapter 30 and the front housing 26. 6 is a sectional view taken along the line VI-VI in FIG. 4B, FIG. 7A is a schematic layout diagram of the main members of the adapter 30, and FIG. 6B is a circuit diagram of the adapter 30. It is.

  As described above, the front housing 26 is integrally connected to the front end of the body 3, and most of the right side portion of the head portion 4 is covered with the upper portion of the front housing 26. Reference numeral 31 shown in FIG. 4A is a dial for adjusting the driving depth. When the dial 31 is rotated, the retraction amount of the contact nose 19 changes. Then, the relative position between the rod 7 and the contact nose 19 changes, and the driving depth of the nail n changes.

  The adapter 30 has an oblong cross section and an elongated shape, and a ridge 32 extending in the longitudinal direction is formed on one flat outer peripheral surface. A cord 33 is connected to the base end in an inseparable manner, and a plug 34 is provided at the tip of the cord 33, while an electrode 35 is exposed at the tip of both arc surfaces. The electrode 35 is provided on a flat surface formed by cutting out an arc surface. Needless to say, the electrode 35 is composed of a positive electrode and a negative electrode. For this reason, the adapter 30 is also provided with an electrode display 36.

  The front housing 26 has a vertically long storage portion 37 that swells to the right side when viewed from the operator. The adapter 30 is fitted into the storage portion 37 from below and stored. As shown in FIG. 3, the storage portion 37 is formed in a bag shape opened downward and toward the magazine 6, and is in a state where one side is closed by the main body 23 of the magazine 6. Therefore, exactly, it can be said that the storage portion is formed by the front housing 26 and the magazine 6.

  The storage portion 37 of the front housing 26 is formed with an outwardly projecting protruding portion 37 a into which the protrusion 32 of the adapter 30 is fitted. For this reason, the insertion direction of the adapter 30 is not mistaken. Further, terminals 38 that are in contact with the electrodes 35 of the adapter 30 are arranged on the front and rear side surfaces of the interior of the front housing 26. Electric power is supplied from the terminal 38 to the fan 11 and the spark plug 12 through a control unit (not shown).

  A notch 39 that opens downward is formed in the vicinity of the opening of the outer surface plate of the storage portion 37, and a rectangular engagement hole is formed in a portion of the protruding portion 37 a of the storage portion 37 that is close to the notch 39. 40 is free. On the other hand, the adapter 30 includes an outer case 41 made of resin, and a ridge 32 is formed on the outer case 41. By forming a U-shaped slit 42 in a portion of the ridge 32 closer to the base end. The base end portion of the ridge 32 is formed as a cantilevered arm portion 43 extending on the opposite side of the cord 33, and the arm portion 43 can be engaged with the engagement hole 40 of the storage portion 37. The nail | claw 44 and the button part 45 which a person can push with a fingertip are formed. The arm portion 43 can be pushed and bent toward the inside of the outer case 41.

  The engaging claw 44 is positioned on the distal end side of the arm portion 43, and a portion of the engaging claw 44 that contacts the end surface of the protrusion 32 when being inserted into the storage portion 37 is formed on the inclined surface 44a. Accordingly, when the adapter 30 is fully inserted into the storage portion 37, the arm portion 43 is elastically deformed and then returned, so that the engagement claw 44 is fitted into the engagement hole 40, whereby the adapter 30 is held so as not to fall off. . Further, when the button portion 45 is pressed, the engaging claw 44 is detached from the engaging hole 40, so that the adapter 30 can be removed from the storage portion 37.

  The button part 45 of the adapter 30 is fitted in the notch 39 of the storage part 37 of the front housing 26. Further, only a small portion of the adapter 30 near the base end is exposed to the outside of the storage portion 37, and the exposed portion of the adapter 30 is in a recess 26a formed below the storage portion 37 in the front housing 26. overlapping. This is because, as shown in FIG. 3, the front and rear side walls of the storage unit 37 are perpendicular to the bottom surface of the main body 23 of the magazine 6, so that the adapter 30 is removed when it is completely stored in the storage unit 37. It is because it becomes impossible.

  As shown in FIG. 7, the adapter 30 includes a fuse 46, a line filter 47, a transistor 48, a photocoupler 49, a transformer 50, a capacitor 51 and the like in addition to the electrode 35 described above.

(3) Summary In the above configuration, the tool is supplied with power from an external power source (building outlet or portable generator) via the cord 33, so that the contact nose 19 and the probe 20 cannot be pulled by a person. Even if no protective means (cover means) is provided, it is not regulated by the sword law, so it can be used without obtaining permission from the police (can be used freely if the regulation is abolished). And since the adapter 30 is accommodated in the storage part 37 of the front housing 26, there is no problem that an object hits and is damaged.

  When the person performs the driving operation, the storage portion 37 of the front housing 26 does not hit the human body at all, and the storage portion 37 of the front housing 26 is located below the head portion 4. However, the presence of the storage unit 37 makes it difficult to see the driving location when performing the work. Therefore, workability is never deteriorated by incorporating the adapter 30 in the tool.

  In the present embodiment, the adapter 30 is held so that it cannot be dropped off when the engaging claw 44 is fitted into the engaging hole 40, so there is no need to provide a cover plate in the storage portion 37, and thus the structure of the tool is simplified. The adapter 30 can be attached and detached with one touch. Note that the engagement means for attaching and detaching the adapter 30 in one touch is not limited to the combination of the engagement claw 44 and the engagement hole 40 as in the embodiment, and various other methods can be employed.

  In the present embodiment, the tool can be changed to a battery specification. In this case, a battery having almost or the same form as that of the adapter 30 may be used (or the adapter 30 may be made to have the same or almost same appearance form as the battery). In such a case, the coping method when the regulation by law becomes a problem is as described in the column of the effect of the invention.

  By the way, when the cord is connected to the tools, the bending force acts on the base of the cord due to the movement of the tool accompanying the work. For this reason, if the cord is used for a long period of time, the cord is easily broken at the base. A phenomenon may occur.

  On the other hand, in this embodiment, the cord 33 hangs down from the storage portion 37, but when this form is adopted, the cord 33 moves greatly as a whole when a person performs a driving operation while moving the tool. The bending load is hardly applied to the base portion, and therefore the cord 33 is not easily broken at the base portion even if it is used for a long time. In the present invention, the cord 33 draws in an external power source (for example, 100 volts) and has a much larger cross-sectional area than a cord for 6 volts or 12 volts, for example. It can be said that thirty-three pieces are suppressed.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, the place where the storage unit is provided can be selected according to the form of the tool and the size of the adapter. For example, it can be provided on the grip or near the base of the grip in the body. When the joint portion exists as in the embodiment, the adapter can be stored in the joint portion. It is also possible to connect the cord to the adapter so that it can be inserted and removed.

(A) is the left view of the whole tool concerning an embodiment, and (B) is a partial side view. It is a partial sectional side view of a drive part. It is the III-III sectional view taken on the line of FIG. 1 (A) and FIG. 4 (A). (A) is a right side view of the tool with the adapter separated, and (B) is a partial right side view with the adapter attached. It is a separation perspective view of an adapter and a front housing. FIG. 4 is a sectional view taken along line IV-IV in FIG. (A) is a rough layout of the main members of the adapter, and (B) is a circuit diagram of the adapter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piston 2 Cylinder 3 Body which comprises a part of a housing 5 Grip 5a Trigger 6 Magazine 7 Driving rod 9 Gas cylinder storage chamber 10 Combustion chamber 11 Fan as an example of electric component 12 Spark plug as an example of electric component 13 Safety Sleeve forming part of device 19 Contact nose forming part of safety device 26 Front housing as part of housing 30 Adapter 33 Cord 34 Plug 35 Electrode 38 Terminal 37 Storage part 40 Part of engaging means Engagement hole 44 engaging claw constituting part of engagement means

Claims (3)

A piston provided with a fastener driving rod, a cylinder in which the piston is slidably inserted, a grip that can be gripped by a human hand, a head portion that guides the back and forth movement of the rod, and a front of the rod in a retracted state A magazine that feeds out fasteners one by one, and a housing that covers the cylinder and forms an appearance of a portion excluding the grip, the head portion, and the magazine,
The piston is driven by the combustion pressure of the gas filled in the cylinder. For this reason, at least an ignition plug is provided as an electrical component, and a power supply unit that supplies DC power to the electrical component is provided. Being
A gas-fired driving tool
The power supply unit is a corded adapter for stepping down and rectifying an external AC power supply, and this adapter is built in the housing or magazine or grip in a state where most or all of the adapter is hidden.
Gas fired driving tool. The housing or the magazine or the grip is provided with a storage unit in which the adapter can be removably attached.
The gas combustion type driving tool according to claim 1. The storage unit can be equipped with a battery of the same or almost the same form as the adapter,
The gas combustion type driving tool according to claim 2.

Images