JP5538747B2 - Pneumatic tool - Google Patents

Description

  The present invention relates to a mainly hand-held tool that uses compressed air as a drive source, such as an air nailing machine.

For example, the air nailing machine described above includes a tool main body with a piston that is operated by compressed air. The tool main body is provided with a driving nose at the tip in the driving direction, and is gripped by the user on the side. A handle portion is provided. Further, the nose portion is equipped with a magazine that houses a number of driving tools and supplies them one by one into the driving passage of the nose portion. For this type of air nailing machine, various devices have been devised in order to improve the usability. For example, the following patent document discloses a device to which an air duster function for blowing off wood chips, dust, and the like around the driving portion is added using compressed air supplied to the tool body.
Japanese Patent No. 3385875 Japanese Patent No. 3654099 JP 2008-142814 A JP 2008-142815 A

However, according to the air dusters disclosed in Patent Documents 1 and 2, since the compressed air after being supplied to the tool body portion side through the pressure accumulation chamber (accumulator) of the handle portion is used, When the compressed air is consumed, the compressed air having a sufficient pressure required for the driving operation is not supplied, and as a result, the driving force may be reduced.
Furthermore, according to the air duster disclosed in Patent Documents 3 and 4, the above-described pressure drop can be avoided because the compressed air for the air duster is branched on the upstream side of the pressure accumulating chamber. Since the operation buttons are arranged in a portion that is difficult to see from the user side, the operation when using the air duster is troublesome, and this point needs to be improved.
The present invention has been made to solve such a conventional problem, and an object of the present invention is to improve operability when using an air duster without causing a pressure drop to the tool main body side.

Said subject is solved by each following invention.
The first invention includes a tool main body operated by compressed air, a driving portion extending in a driving direction from the tip of the tool main body, a side extending from the side of the tool main body, and supplied to the tool main body inside. An air tool having a handle portion having a pressure accumulation chamber for compressed air and an air duster provided at the tip of the handle portion, the air duster having a duster nozzle for blowing compressed air and a duster button operated by a user The duster nozzle extends from the front side of the front end of the handle part to the driving part side, and the duster button is an air tool arranged on the back side of the front end of the handle part and opposite to the compressed air blowing direction of the duster nozzle.
According to the first invention , since the air duster is provided at the tip of the handle portion, the air pressure of the compressed air supplied to the tool body portion is not reduced, and therefore the driving force of the tool body portion is reduced. Is not invited. Moreover, since the duster button operated when using the air duster is disposed on the back side of the front end of the handle portion that is easily visible to the user, the operability of the air duster can be improved.
According to a second invention, in the first invention, a magazine is provided between the driving portion and the handle portion for accommodating a driving tool supplied to the driving portion, and the duster nozzle is provided along a side portion of the magazine. The air tool is configured such that compressed air is blown out from the vicinity of the front end of the magazine in the driving direction.
According to the second aspect of the invention , since the compressed air is blown from a position closer to the driving portion than the tip of the handle portion, it is possible to blow off the driving portion and its surrounding wood chips and dust more efficiently.
A third invention is the air tool according to the first or second invention, wherein the duster button is provided with a protective wall portion for preventing erroneous operation on the side.
According to the third aspect of the present invention , it is possible to prevent the duster button from being inadvertently operated and operating the air duster when it is accidentally overturned or dropped, or when another article contacts the duster button. Can do.
According to a fourth invention, in any one of the first to third inventions, an air duster on-off valve is disposed in an upstream air passage that is airtightly partitioned from the pressure accumulating chamber by a check valve. During the operation, the check valve is opened and compressed air is supplied to the pressure accumulating chamber through the upstream air passage.When the duster button is operated, the check valve is closed to prevent backflow from the pressure accumulating chamber. This is an air tool configured such that compressed air is blown from a duster nozzle through an on-off valve from an air passage.
According to the fourth invention , the check valve opens the on-off valve without causing a pressure drop in the pressure accumulating chamber, and the compressed air is blown out from the outlet, so that the user only has to open the on-off valve. In addition, since it is not necessary to perform a shut-off operation from the pressure accumulating chamber as in the prior art, the air duster can be used in one operation, and the operability of the air duster can be enhanced in this respect.

1 is an overall side view of an air tool according to an embodiment of the present invention. It is sectional drawing of the handle | steering-wheel part vicinity of an air tool, Comprising: It is a longitudinal cross-sectional view of an air duster. It is the top view which looked at the back of the handle | steering-wheel part front end from the arrow (III) direction in FIG. In this figure, the duster button and the protective wall portion of the air duster are shown in a plan view. It is a side view of the state which grips an air tool in a hanging attitude and uses an air duster.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an entire air tool 1 including an air duster 10 according to the first embodiment. In the present embodiment, a compressed air drive type nailing machine (driving tool) is illustrated as an example of an air tool. In the embodiment described below, the basic configuration of the air tool 1 is not particularly changed, and thus detailed description thereof is omitted. In this specification, with respect to the direction of each member or configuration, the direction in which the driving tool is driven as shown in the drawing is the lower side, and the user side is the upper side.
The air tool 1 is an air-driven nailing machine that operates using compressed air as a drive source, and includes a tool body 2, a handle 3, and a magazine 4. A driving portion 5 (nose portion) is provided below the tool main body 2 so as to protrude downward. A lower end portion of the driving portion 5 is an injection port 5a through which the driving tool is driven out.
When compressed air is supplied to the upper chamber of the piston 6 housed in the tool body 2, the piston 6 is moved and the driving driver 7 provided integrally therewith moves down in the driving portion 5. In the driving unit 5, driving tools are supplied one by one from the magazine 4 in conjunction with the driving operation of the tool body unit 2. For this reason, when the driver 7 moves down, one driving tool is hit by the driver 7 and driven out from the injection port 5 a of the driving unit 5.
The handle part 3 is provided in a state of protruding from the side of the tool body part 2 to the side. The inside of the handle portion 3 serves as a pressure accumulation chamber (accumulator) 8 for storing compressed air to be supplied to the tool body portion 2. An air hose 9 is connected to the tip of the handle portion 3. Compressed air is supplied from the compressed air source to the pressure accumulating chamber 8 through the air hose 9.
A trigger-type switch lever 3 a and a switch valve 3 b are disposed near the base of the handle portion 3. When the switch lever 3a is pulled with the fingertip of the hand holding the handle portion 3, the switch valve 3b is turned on, and compressed air is supplied from the pressure accumulating chamber 8 to the tool body portion 2 side to perform a driving operation.
The magazine 4 is loaded with a connecting driving tool in which a large number of driving tools are connected in parallel at regular intervals, and a storage portion 4a having a cylindrical box shape for storing the connecting driving tool in a spiral state; A lid 4b is provided for closing the lid. A feed mechanism 4 c is provided between the accommodating portion 4 a and the driving portion 5 to pitch-feed the connecting driving tool into the driving passage of the driving portion 5 in conjunction with the driving operation of the tool body portion 2. In the figure, illustration of the connecting driving tool is omitted.

The air tool 1 of the present embodiment has a great feature in the air duster 10 provided at the tip of the handle portion 3. The air duster 10 is used, for example, when wood chips or dust on the driving material W is blown off with compressed air to improve the visibility around the driving site.
Details of the tip of the handle 3 and the air duster 10 are shown in FIG. The air duster 10 includes a check valve 11, an exhaust valve 16, and an on-off valve 20. These are attached to the frame 12. The frame body 12 is attached to the distal end portion of the handle portion 3. The pressure accumulation chamber 8 is airtightly closed by the frame body 12. An air passage 30 is formed at the center of the frame body 12. An air hose 9 is connected to the upstream end portion of the air passage 30 through a plug 15.
A boss portion 12a is provided on the inner surface (the pressure accumulating chamber 8 side) of the frame body 12. The boss portion 12 a protrudes into the pressure accumulation chamber 8. The boss portion 12 a protrudes into the pressure accumulation chamber 8 through the insertion hole 13 a of the air cleaning filter 13. An exhaust valve 16 is attached to a downstream end portion (hereinafter referred to as an exhaust port 12c) of the air passage 30 opened at the tip of the boss portion 12a. Seal rings 16 a and 16 b are attached to the exhaust valve 16. The exhaust valve 12 opens and closes the exhaust port 12c. In a state in which compressed air is supplied to the air passage 30, the exhaust port 12 c is hermetically sealed by the exhaust valve 16 due to a pressure receiving area difference between the pressure receiving area of the exhaust valve 16 on the air passage 30 side and the pressure receiving area on the pressure accumulation chamber 8 side. Closed. When the air pressure in the air passage 30 decreases due to, for example, the supply of air from the air hose 9 being stopped, the exhaust valve 16 is displaced in the direction of opening the exhaust port 12c (right side in FIG. 2) by the air pressure on the pressure accumulation chamber 8 side. To do. When the exhaust port 12c is thus opened, the compressed air in the pressure accumulating chamber 8 is exhausted to the atmosphere through the air passage 30.
A plurality of air supply holes 12d to 12d are formed in the boss portion 12a. A seal ring 14 is attached to the outer periphery of the air supply holes 12d to 12d. When compressed air is supplied into the air passage 30 on the inner peripheral side of the boss portion 12a, the seal ring 14 is expanded by the pressure, and the air supply holes 12d to 12d are opened to the pressure accumulation chamber 8 side. Since the air passage 30 is communicated with the pressure accumulating chamber 8 side by opening the air supply holes 12d to 12d, the compressed air supplied from the compressed air supply source to the air passage 30 through the air hose 9 passes through the air hole 12d. 8 is supplied.
When compressed air is no longer supplied to the air passage 30 or when the air pressure in the air passage 30 decreases, the seal ring 14 is pressed against the air supply holes 12d to 12d by the air pressure in the pressure accumulating chamber 8, and therefore the air supply holes 12d to 12d As a result of hermetically sealing, the pressure accumulating chamber 8 is hermetically shut off from the air passage 30. For this reason, the check holes 11 are configured by the air supply holes 12d to 12d and the seal ring 14 to supply the compressed air from the air passage 30 to the pressure accumulating chamber 8 while blocking the flow of the compressed air. . As described above, when compressed air is supplied into the air passage 30, the exhaust valve 16 is closed, while the check valve 11 is opened and compressed air is supplied into the pressure accumulating chamber 8. Conversely, when the supply of compressed air into the air passage 30 is stopped, the check valve 11 is closed, while the exhaust valve 16 is opened and the compressed air in the pressure accumulating chamber 8 is exhausted.

An on-off valve 20 is attached in the middle of the air passage 30. The on-off valve 20 includes a frame body 21 fixed in a state of penetrating the air passage 30 in a radial direction (vertical direction in FIG. 2), and an on-off stem 22 movably supported on the inner peripheral side of the frame body 21. I have. The frame body 21 is fixed in a state straddling between an upper support hole 30 a and a lower support hole 30 b provided vertically in the radial direction from the midway position of the air passage 30. The opening / closing stem 22 is biased upward by a compression spring 23 interposed between a lower portion thereof and a bottom portion of the lower support hole 30b. The upper part of the opening / closing stem 22 protrudes from the upper part of the frame body 21 (the back side of the handle part 3). A duster button 24 is attached to the upper end of the protruding portion. The duster button 24 is positioned on the top surface of the tip of the handle portion 3. When the user pushes the duster button 24 against the compression spring 23 with a fingertip, the open / close stem 22 is displaced downward and the open / close valve 20 is opened. . As described above, the duster button 24 is arranged on the upper surface (the rear side, the opposite side to the driving direction) of the handle portion 3 that is easily visible to the user, so that the operability is improved.
Two seal rings 22 a and 22 b are attached to the opening / closing stem 22. Between the upper and lower seal rings 22 a and 22 b, the periphery of the opening / closing stem 22 is communicated with the ventilation path 30 through a ventilation hole 21 a provided in the frame body 21. When the open / close stem 22 is displaced downward by the push-down operation of the duster button 24, the lower seal ring 22b is removed from the inner peripheral hole of the frame body 21, and the lower support hole 30b is connected to the inner peripheral side of the frame body 21 and the vent hole. The air passage 30 is communicated with the air passage 30 through 21a, whereby the on-off valve 20 is opened. When the push-down operation of the duster button 24 is released, the opening / closing stem 22 is displaced upward by the compression spring 23 and the lower seal ring 22b is slidably contacted with the inner peripheral hole of the frame body 21, so that the lower support hole 30b and Communication with the air passage 30 is blocked, and the on-off valve 20 is closed.
The lower support hole 30b communicates with the duster nozzle 25 through a vent 30c. The upper end of the duster nozzle 25 is fixed to the lower surface side of the frame 12 (front surface, opposite to the duster button 24). As the duster nozzle 25, a long and narrow resin nozzle is used. The duster nozzle 25 extends downward along the side portion of the accommodating portion 4 a of the magazine 4. As shown in FIG. 1, the tip (lower end) of the duster nozzle 25 reaches the lower surface of the magazine 4. The tip of the duster nozzle 25 is a compressed air outlet 25a.
When the user pushes down the duster button 24 with the fingertip, the opening / closing stem 22 is displaced downward (opening side) and the opening / closing valve 20 is opened. When the on-off valve 20 is opened, the duster nozzle 25 is communicated with the air passage 30 and the compressed air in the air passage 30 is injected from the outlet 25a. When the push-down operation of the duster button 24 is released, the open / close stem 22 is returned to the upper side (close side) by the compression spring 23 and the open / close valve 20 is closed. When the on-off valve 20 is closed, the duster nozzle 25 is blocked from the air passage 30 and compressed air is no longer injected from the outlet 25a.
As shown in FIG. 3, protective wall portions 26 are provided on both sides of the duster button 24 and on the upper surface of the frame body 12. The heights of the two protective wall portions 26 and 26 are substantially the same as the height when the duster button 24 is not operated. Due to the two protective walls 26, 26, for example, even when a foreign object hits the duster button 24 or the air tool 1 is accidentally overturned or dropped, the duster button 24 is pushed down, and the on-off valve 20 is inadvertently used. This prevents the air duster 10 from being erroneously operated.

According to the air duster 10 included in the air tool 1 of the present embodiment described above, when the user pushes the duster button 24 with a fingertip, the on-off valve 20 is opened, and compressed air is blown out from the outlet 25a of the duster nozzle 25. it can. By blowing out compressed air from the duster nozzle 25 and blowing off dust and chips around the driving portion, the user can position the injection port 5a in a state in which the driving portion is clearly visible, so that a reliable and careful driving operation is performed. Can be done quickly.
Further, the duster nozzle 25 outlet 25a is disposed at the lower end of the magazine housing portion 4a, and the compressed air is blown out from the position closer to the driving portion than the tip of the handle portion 3 toward the driving portion. The air duster 10 can be used efficiently with almost the same posture without moving the air tool 1 from the posture at that time.
Further, since the dust outlet 25a of the duster nozzle 25 is directed to the driving site side (lower side in FIG. 1) and the duster button 24 is disposed on the upper surface (back surface) of the handle portion on the opposite side, the driving operation is performed. The air duster 10 can be used in an almost unchanged posture without greatly changing the posture at the time, and the duster button 24 is disposed at a position that is easy for the user to see. In this respect, the air duster 10 has good operability. (Usability) is secured.
Further, as shown in FIG. 4, by gripping the handle portion 3 in a hanging posture in which the tool main body portion 2 and the handle tip end portion are reversed with respect to the gripping posture of the air tool 1 during normal use (at the time of driving operation). The duster button 24 of the air duster 10 can be pushed down with the thumb of the gripped hand. In this respect, the duster button 24 is arranged on the rear side of the front end of the handle portion 3, so that the usability of the air duster 10 in the hanging posture is further improved. Further, if the handle portion 3 is gripped in this hanging posture, the switch lever 3a is not accidentally pulled, so that simultaneous use of the air duster 10 during the driving operation can be avoided.
Further, when the handle portion 3 is gripped in this hanging posture, the heavy tool body portion 2 is positioned on the lower side and the center of gravity of the air tool 1 is positioned on the lower side of the gripped hand. The air tool 1 can be easily carried, and the air duster 10 can be used quickly without changing from the easy hanging posture.

Further, according to the illustrated air duster 10, the protective wall portions 26, 26 are provided on both sides of the duster button 24. Therefore, when the air tool 1 is accidentally overturned or dropped, or another member hits the duster button 24. Even in this case, the duster button 24 is not inadvertently pushed down, thereby preventing malfunction of the air duster 10 in advance.
Further, the illustrated air duster 10 includes a check valve 11. The check valve 11 prevents the backflow of compressed air from the pressure accumulation chamber 8 to the ventilation path 30. For this reason, even if the compressed air in the air passage 30 is blown out from the outlet 25a by the depression operation of the duster button 24, the air pressure in the pressure accumulating chamber 8 is not lowered. Never come. As described above, according to the air duster 10 illustrated, the check valve 11 prevents the backflow of the compressed air in the pressure accumulating chamber 8, so that the duster button 24 is pushed down without requiring two operations as in the prior art. In this respect, good operability of the air duster 10 is ensured.
Various modifications can be made to the embodiments exemplified above. For example, the nailing machine is illustrated as an air tool, but the illustrated air duster 10 may be applied to other air tools that use compressed air as a power source, such as a drilling screwdriver or a screw tightening tool. it can.
Further, the protective wall portions 26, 26 provided on both sides of the duster button 24 may be omitted. In addition, the configuration in which the position where the duster button 24 protrudes from the back surface (upper surface, user side) of the handle portion 3 when the air duster 10 is not used is illustrated as the off position. The back position may be the off position. In this case, instead of the illustrated protective wall portions 26, 26, the back surface of the handle portion 3 performs the same malfunction prevention function.
Furthermore, although the duster button 24 to be pushed is illustrated, a duster button to be slid may be used. When the duster button is slid to the on position side against the spring biasing force, the opening / closing stem is displaced to the opening side and the opening / closing valve 20 is opened, whereby compressed air is blown out from the duster nozzle outlet. .
Moreover, although the resin-made elongate nozzle was illustrated as the duster nozzle 25, it may replace with this and may use metal nozzles, such as stainless steel, for example, and can also use the tube (hose) which has flexibility.

W ... Driving material 1 ... Air tool (air nailing machine)
DESCRIPTION OF SYMBOLS 2 ... Tool body part 3 ... Handle part, 3a ... Switch lever, 3b ... Switch valve 4 ... Magazine, 4a ... Storage part, 4b ... Cover part, 4c ... Feed mechanism 5 ... Driving part (nose part), 5a ... Injection port 8 ... Accumulation chamber (accumulator)
DESCRIPTION OF SYMBOLS 9 ... Air hose 10 ... Air duster 11 ... Check valve 12 ... Frame, 12a ... Boss part, 12c ... Exhaust port, 12d ... Air supply hole 13 ... Filter, 13a ... Insertion hole 14 ... Seal ring 15 ... Plug 16 ... Exhaust valve, 16a, 16b ... seal ring 18 ... exhaust hole 20 ... open / close valve 21 ... frame, 21a ... vent hole 22 ... open / close stem, 22a, 22b ... seal ring 23 ... compression spring 24 ... duster button 25 ... duster nozzle, 25a ... outlet 26 ... Protective wall 30 ... Air passage, 30a ... Upper support hole, 30b ... Lower support hole, 30c ... Vent hole

Claims (3)

A tool main body operated by compressed air, a driving part extending in the driving direction from the tip of the tool main body, and a compressed air supplied to the tool main body from the side of the tool main body to the side. An air tool including a handle portion having an accumulator chamber and an air duster provided at a tip of the handle portion,
A magazine for accommodating a driving tool supplied to the driving unit is provided between the driving unit and the handle unit,
The air duster includes a duster nozzle that blows out compressed air, and a duster button that is operated by a user. The duster nozzle extends from the front side of the front end of the handle portion along the side of the magazine, and the front end of the magazine in the driving direction. Compressed air can be blown out from the vicinity of the front end of the magazine spaced apart from the driving portion through the outlet of the duster nozzle, and the duster button is on the rear side of the front end of the handle portion. An air tool located on the opposite side of the duster nozzle from the compressed air blowing direction. The air tool according to claim 1 , further comprising a protective wall portion for preventing erroneous operation on a side of the duster button. The air tool according to claim 1 or 2 , wherein an on-off valve of the air duster is disposed in an upstream air passage that is airtightly partitioned from the pressure accumulation chamber by a check valve, and when the duster button is not operated, A check valve is opened and compressed air is supplied to the pressure accumulating chamber through the upstream air passage, and when the duster button is operated, the check valve is closed to prevent backflow from the pressure accumulating chamber, An air tool configured such that compressed air is blown from the duster nozzle through the on-off valve from the upstream air passage.

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