JP2022100745A - Driving tool - Google Patents

Abstract

To provide a compressed-air driven type nailing machine equipped with an air duster, the nailing machine being designed such that lubricating oil is supplied to reduce frictional resistance of the seal rings of a main body valve and a start valve and such that a dry air formation of the air duster is achieved while an increase in cost is avoided with a simple configuration by devising the position of a lubricating port.SOLUTION: A start valve 7 is provided on a downstream side of a valve channel 15b branched from a main body channel 8a. A lubricating port 30 is disposed on a side of the start valve 7. Lubricating oil is supplied from the lubricating port 30 to the start valve 7. Thus, oil content of the supplied lubricating oil is prevented from being dispersed in an air duster 20.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a driving tool such as a compressed air driven nail gun.

In this type of driving tool, lubrication is appropriately performed to lubricate the internal seal portion and the like. Refueling is performed, for example, through a hose connection plug for supplying compressed air provided at the tip of the grip portion or a lubrication port provided around the hose connection plug. The oil supplied from the lubrication port is sprayed into the accumulator chamber inside the grip portion. The oil is supplied to the start valve and the driving mechanism of the tool body via the accumulator chamber.

On the other hand, this type of driving tool is provided with an air duster function of blowing compressed air to blow off dust and the like. When oil is mixed with the compressed air blown out from the air duster, the oil adheres to the material to be driven or its surroundings, which deteriorates the work quality. In order to solve this problem, Patent Document 1 discloses a technique of branching the inside of a plug for connecting an air hose to separate a compressed air supply path for a device main body and a compressed air supply path for an air duster. .. By providing a lubrication port in the compressed air supply path for the main body of the equipment on the downstream side of the branch, oil was not supplied to the air duster.

Japanese Unexamined Patent Publication No. 2009-14066

However, in the technique disclosed in Patent Document 1, it is necessary to prepare a dedicated plug having a branched flow path as a hose connection plug for supplying compressed air. In addition, it is necessary to connect a dedicated branch hose to the air duster in the flow path for the branched air duster. In these respects, the configuration becomes complicated and the cost increases. Therefore, it is necessary to make the air duster dry air while avoiding high cost with a simple configuration.

According to one feature of the present disclosure, the driving tool has a driving mechanism using compressed air as a drive source and a tool main body portion including the driving mechanism. The grip part protrudes from the tool body part. It has a pressure accumulator inside the grip. At the end of the grip portion, there is a hose connection portion to which an air hose that supplies compressed air to the accumulator chamber is connected. Further, the driving tool has an air duster that injects compressed air in the accumulator chamber. The accumulator chamber and the driving mechanism are communicated with each other through the main body flow path. The air duster is fluidly communicated by the duster flow path branched from the main body flow path. Regarding the flow of the main body flow path, the lubrication port is provided on the downstream side of the duster flow path or on the downstream side of the branch flow path branched from the main body flow path.

Therefore, the flow of the main body flow path is lubricated to the downstream side of the duster flow path or the downstream side of the branch flow path branched from the main body flow path. As a result, the lubricated oil is prevented or suppressed from flowing into the air duster. Since the conventional dedicated plug and branch hose are not used, the air duster can be made into dry air while avoiding high cost with a simple configuration.

According to another feature of the present disclosure, the lubrication port is opened in a branch chamber communicating with the main body flow path via the branch flow path. Therefore, since lubrication is performed in the branch chamber, the inflow of oil into the air duster is avoided or suppressed.

According to another feature of the present disclosure, the driving tool has a switch lever movably provided on the tool body and a start valve interlocked with the switch lever. The start valve is housed in the branch chamber. Therefore, the oil content lubricated from the lubrication port is lubricated to the tool body through the start valve.

According to another feature of the present disclosure, the driving tool has a switch lever movably provided on the tool body and a start valve interlocked with the switch lever. The start valve is housed in a start valve chamber that communicates with the main body flow path via the branch flow path. The lubrication port opens to the start valve chamber at the part where the branch flow path deviates from the branch flow path. Therefore, lubrication to the start valve is performed at a portion deviated from the branch flow path (disengaged portion). Therefore, it is prevented that the lubricated oil flows back through the branch flow path and infiltrates into the main body flow path or the accumulator chamber. As a result, the duster air can be made into dry air more reliably.

According to another feature of the present disclosure, the driving tool has a switch lever movably provided on the tool body and a start valve interlocked with the switch lever. The start valve is housed in a start valve chamber that communicates with the main body flow path via the branch flow path. The start valve chamber is communicated with the main body valve chamber via an air supply / exhaust passage. The main body valve of the driving mechanism is housed in the main body valve chamber. A lubrication port is opened in the air supply / exhaust passage. Therefore, the oil content lubricated in the working air supplied and exhausted between the start valve chamber and the main body valve chamber is dispersed in both the main body valve and the main body valve.

According to another feature of the present disclosure, when the longitudinal direction of the tool body portion is the vertical direction and the longitudinal direction of the grip portion is the front-rear direction, the lubrication port is the first side surface of any one of the left and right side surfaces of the tool body portion. Has an entrance that opens to. Therefore, lubrication is performed from the first side surface of the tool body.

According to other features of the present disclosure, it has a lubrication port on the right side surface of the tool body. Therefore, lubrication is performed from the right side portion of the tool body portion when viewed from the user who grips the grip portion.

According to another feature of the present disclosure, a duster operating portion for operating the air duster is provided on the second side surface of any one of the left and right side surfaces of the tool main body portion. Therefore, the air duster is operated on the second side surface of the tool body. By arranging the lubrication port on one first side surface and the duster operation unit on the other second side surface in a distributed manner with respect to the longitudinal direction of the tool body, these arrangements are made as compared with the configuration in which they are centrally arranged on one side. Increases the degree of freedom.

According to another feature of the present disclosure, the hose connection has an air supply port through which compressed air flows. The opening diameter of the inlet of the lubrication port is larger than the opening diameter of the air supply port of the hose connection. Therefore, lubrication is performed quickly and reliably.

According to other features of the present disclosure, it has a removable lid that closes the lubrication port. Therefore, the lid can be removed and lubricated. A lid is attached to prevent oil leakage.

According to other features of the present disclosure, the lid is urged to the closed side by an urging member. The lid is manually opened against the urging force of the urging member. Therefore, when the manual operation is released, the lid is automatically closed by the urging force of the urging member to prevent leakage of the lubricated oil.

It is a left side view of the driving tool which concerns on this embodiment. It is a right side view of the driving tool which concerns on this embodiment. It is a vertical sectional view of the driving tool which concerns on this embodiment. This figure is a vertical sectional view seen from the left side. FIG. 3 is an enlarged cross-sectional view taken along the line IV-IV in FIG. 3, which is a cross-sectional view of the start valve viewed from below. It is a vertical sectional view of the driving tool which concerns on this embodiment. This figure shows the driving operation state in which the switch lever is pulled. It is a vertical sectional view of a duster flow path. It is a cross-sectional view of Dusta. It is a vertical sectional view of the lubrication port which concerns on 2nd Embodiment. This figure shows the closed state. It is a vertical sectional view of the lubrication port which concerns on 2nd Embodiment. This figure shows the open state.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 9. As shown in the figure, in the present embodiment, a compressed air-driven nail gun is exemplified as an example of the driving tool 1. In this specification, with respect to the direction of each member or configuration, the direction in which the driving tool is driven is the lower side and the user side is the rear side as shown in the figure.

The driving tool 1 is an air-driven nail gun that operates using compressed air as a drive source, and includes a tool main body portion 2, a grip portion 3, and a magazine 4. A driving nose portion 5 is provided in a state of protruding downward at the lower portion of the tool main body portion 2. The lower end of the driving nose portion 5 is an injection port 5a into which the driving tool is launched.

As shown in FIGS. It has a configuration. A driver 11 for striking is attached to the center of the lower surface of the piston 10. The driver 11 extends downward long, and its tip portion reaches the inside of the driving passage 5b of the driving nose portion 5.

The upper part of the main body housing 15 is airtightly closed by the top cap 18. The inner surface of the top cap 18 is equipped with an upper moving end damper 18a that absorbs an impact at the upper moving end position of the piston 10. A lower moving end damper 19 that absorbs an impact at the lower moving end position of the piston 10 is incorporated in the lower part of the cylinder 12.

As shown in FIG. 5, when compressed air is supplied to the cylinder upper chamber 12d, the piston 10 moves downward in the cylinder 12 and the striking driver 11 moves downward in the driving passage 5b. In the driving passage 5b, one driving tool n is supplied from the magazine 4 in conjunction with the driving operation of the tool main body 2. Therefore, when the driver 11 moves downward, one driving tool n is hit by the driver 11 and is launched from the injection port 5a of the driving nose portion 5. As shown in FIG. 1, one driving tool n hit by the driver 11 is launched from the injection port 5a and driven into the material W to be driven.

The grip portion 3 is provided so as to protrude laterally from the side portion of the tool main body portion 2. The inside of the grip portion 3 is a pressure accumulator 8 for storing compressed air to be supplied to the tool main body portion 2. A hose connecting portion 9 for connecting the air hose 9a is provided at the tip of the grip portion 3. Compressed air is supplied from the compressed air source (air compressor) to the accumulator chamber 8 via the air hose 9a connected to the hose connection portion 9. A one-touch type connection plug is used for the hose connection portion 9.

A trigger type switch lever 6 is provided near the base of the grip portion 3. The start valve 7 is arranged above the switch lever 6. When the switch lever 6 is pulled upward with the fingertip of the hand holding the grip portion 3, the start valve 7 is turned on. When the start valve 7 is turned on, the driving operation is performed. The details of the start valve 7 will be described later.

As shown in FIGS. Have been placed. An upper upper surface chamber 13a and a lower lower surface chamber 13b are provided around the main body valve 13. A compression spring 13c that urges the main body valve 13 in the closing direction (upward) is interposed in the lower surface chamber 13b. A plurality of compression springs 13c are arranged around the compression springs 13c at appropriate intervals.

The air pressure of the accumulator chamber 8 is constantly acting on the upper surface chamber 13a. Compressed air in the accumulator chamber 8 is supplied and exhausted to the lower surface chamber 13b via the air supply / exhaust passage 14 and the start valve 7. An exhaust chamber 13d is provided between the upper surface chamber 13a and the lower surface chamber 13b. The exhaust chamber 13d is always in communication with the atmosphere via the exhaust passage 16. The exhaust of the lower surface chamber 13b is also made by communicating with the atmosphere.

As shown in FIG. 3, in the initial state (non-operated state) of the driving tool 1, the compressed air supplied to the accumulator chamber 8 acts on both the upper surface chamber 13a and the lower surface chamber 13b of the main body valve 13. In this initial state, the main body valve 13 moves upward due to the pressure receiving area difference between the upper surface chamber 13a and the lower surface chamber 13b and the urging force of the compression spring 13c, and is in contact with the upper moving end damper 18a. As a result, the cylinder upper chamber 12d is held in a closed state with respect to the accumulator chamber 8. FIG. 3 shows the closed state of the main body valve 13.

As shown in FIG. 5, when the start valve 7 is turned on by pulling the switch lever 6 as described above, the lower surface chamber 13b of the main body valve 13 is opened to the atmosphere via the air supply / exhaust passage 14, the start valve 7, and the exhaust passage 16. Will be done. Since the lower surface chamber 13b is opened to the atmosphere and switched to a state in which air pressure does not act, the main body valve 13 is moved downward by the air pressure acting on the upper surface chamber 13a, and the cylinder upper chamber 12d is opened with respect to the accumulator chamber 8. FIG. 5 shows a state in which the main body valve 13 moves downward and the upper portion thereof is separated from the upper moving end damper 18a. When the main body valve 13 moves downward to open, compressed air is supplied from the accumulator chamber 8 to the cylinder upper chamber 12d as shown by an arrow in FIG. 5, and the piston 10 moves downward. As described above, the downward movement of the piston 10 causes the driving operation of one driving tool n to be performed.

Details of the start valve 7 are shown in FIG. The start valve 7 includes a valve stem 7a, a first valve body 7b, and a second valve body 7c. A compression spring 7d is interposed between the valve stem 7a and the first valve body 7b. The valve stem 7a is urged to the off side (downward in FIG. 4) by the compression spring 7d. The first valve body 7b is housed on the inner peripheral side of the second valve body 7c so as to be vertically displaceable. The second valve body 7c is housed in the start valve chamber 15a (branch chamber) in a non-displaceable manner. The start valve chamber 15a is provided on the downstream side of the accumulator chamber 8 and integrally on the side portion of the main body housing 15. The inside of the start valve chamber 15a is always in communication with the accumulator chamber 8 via the valve flow path 15b. The valve flow path 15b corresponds to a branch flow path branched from the accumulator chamber 8 (main body flow path 8a). Therefore, the inner peripheral side of the second valve body 7c is always communicated with the accumulator chamber 8 through the ventilation hole 7e. The upper inner peripheral side of the first valve body 7b and the upper inner peripheral side of the second valve body 7c are communicated with the exhaust passage 16 (atmosphere side).

FIG. 4 shows the off state of the start valve 7. In the off state, the annular first seal ring 7f mounted around the first valve body 7b is separated from the inner peripheral surface of the second valve body 7c, and is also mounted around the first valve body 7b. The second seal ring 7g is pressed against the inner peripheral surface of the second valve body 7c. Therefore, the air supply / exhaust passage 14 is communicated with the accumulator chamber through the ventilation holes 7e and the air supply / exhaust holes 7h, and the compressed air is supplied to the lower surface chamber 13b of the main body valve 13 (the main body valve 13 is closed). ing. The inner peripheral side of the second valve body 7c is shielded from the exhaust passage 16 by the second seal ring 7g.

When the valve stem 7a is pushed upward against the compression spring 7d by the pulling operation of the switch lever 6, the first valve body 7b is lowered by the air pressure of the accumulator chamber 8 acting on the inner peripheral side of the second valve body 7c. Move. When the first valve body 7b moves downward with respect to the second valve body 7c, the first seal ring 7f of the first valve body 7b is pressed against the inner peripheral surface of the second valve body 7c, and the second seal ring 7g is the second. 2 Separated from the inner peripheral surface of the valve body 7c. Therefore, the upper inner peripheral side of the second valve body 7c is opened to the atmosphere. Therefore, the lower surface chamber 13b of the main body valve 13 is opened (exhausted) to the atmosphere through the air supply / exhaust holes 7h and the air supply / exhaust passage 14. When the lower surface chamber 13b is exhausted as described above, the main body valve 13 moves downward to perform a driving operation.

At the stage when the piston 10 reaches the lower moving end and the driving operation is completed, a part of the compressed air flowing into the cylinder upper chamber 12d flows into the return air chamber 12a via the check valve 12b, and this flows into the return air chamber 12a. Then, it acts on the lower surface side of the piston 10. On the other hand, when the pulling operation of the switch lever 6 is released after the driving operation, the start valve 7 is turned off. When the start valve 7 is turned off, the first valve body 7b moves upward and the first seal ring 7f separates from the inner peripheral surface of the second valve body 7c. As a result, the air supply / exhaust holes 7h and the air supply / exhaust passage 14 are communicated with the accumulator chamber 8.

When the start valve 7 is turned off in this way, compressed air flows into the lower surface chamber 13b of the main body valve 13 via the air supply / exhaust holes 7h and the air supply / exhaust passage 14. As a result, the main body valve 13 is moved upward by the air pressure of the lower surface chamber 13b and the urging force of the compression spring 13c. When the main body valve 13 moves upward, the cylinder upper chamber 12d is closed with respect to the accumulator chamber 8 while being opened to the atmosphere. The cylinder upper chamber 12d communicates with the atmosphere via the inner peripheral side of the main body valve 13, the exhaust chamber 13d, and the exhaust passage 16. When the start valve 7 is turned off and the cylinder upper chamber 12d is opened to the atmosphere in this way, the piston 10 is returned to the upper moving end position by the compressed air in the return air chamber 12a.

The magazine 4 is loaded with a connecting driving tool in which a large number of driving tools n are connected in parallel at regular intervals, and has a tubular box shape for accommodating the connecting driving tools in a spiral state. A feeding mechanism 17 is provided between the magazine 4 and the driving nose portion 5 to feed the connecting driving tool into the driving passage 5b of the driving nose portion 5 in conjunction with the driving operation of the tool main body portion 2. When the feed mechanism 17 operates in conjunction with the driving operation of the tool main body 2, the connecting driving tool loaded in the magazine 4 is pitch-fed, and one driving tool n is provided in the driving passage 5b of the driving nose portion 5. It is supplied one by one.

The driving nose portion 5 is provided with a contact lever 5c for switching between valid and invalid of the pulling operation of the switch lever 6. The contact lever 5c is supported so as to be vertically displaceable with respect to the driving nose portion 5. By pushing down the driving tool 1 in the driving direction with the contact lever 5c in contact with the material W to be driven, the contact lever 5c moves upward relative to the driving nose portion 5. By moving the contact lever 5c relatively upward, the pulling operation of the switch lever 6 becomes effective. Therefore, the pulling operation of the switch lever 6 is effective only when the contact lever 5c is brought into contact with the material W to be driven and the driving tool 1 is pushed down, whereby the contact lever 5c is relatively moved upward. The driving operation is performed. In a state where the contact lever 5c is not relatively moved upward, the start valve 7 does not turn on even if the switch lever 6 is pulled to the on side, so that the tool body 2 does not perform a driving operation.

As shown in FIG. 6, the accumulator chamber is located on the downstream side of the accumulator chamber 8 (base side of the grip portion 3) and on the downstream side of the valve flow path 15b (branch flow path) for supplying compressed air to the start valve 7. 8 is branched into a main body flow path 8a and a duster flow path 8b. The main body flow path 8a and the duster flow path 8b are each fluidly communicated with the accumulator chamber 8. Compressed air is supplied to the cylinder upper chamber 12d via the main body flow path 8a. Compressed air is supplied to the air duster 20 described below via the duster flow path 8b. The valve flow path 15b is branched from the main body flow path 8a in the middle of the main body flow path 8a from the accumulator chamber 8 to the tool main body portion 2. The start valve 7 is arranged on the downstream side of the branched valve flow path 15b. Further, regarding the flow of compressed air in the main body flow path 8a, the duster flow path 8b is branched from the main body flow path 8a on the downstream side of the branch portion of the valve flow path 15b. The air duster 20 described below is arranged on the downstream side of the duster flow path 8b.

The driving tool 1 of the present embodiment includes an air duster 20 that blows out compressed air by a user's operation, in addition to a series of driving operations in the tool body 2. By blowing compressed air onto wood chips and dust around the driving site with the air duster 20, the visibility around the driving site can be improved, whereby accurate driving work can be performed quickly. The air duster 20 is a side portion of the tool body portion 2 and is provided between the base portion of the grip portion 3 and the cylinder 12 at a position in the front-rear direction in which the grip portion 3 extends. Therefore, the air duster 20 can use the air duster 20 by operating the duster button 21 with the thumb, for example, without changing the grip of the hand with respect to the grip portion 3 at the time of the driving operation.

Details of the air duster 20 are shown in FIG. The air duster 20 has a configuration in which one valve stem 23 is airtightly housed in a valve chamber 22 provided in the main body housing 15. The right end of the valve chamber 22 communicates with the atmosphere through the air hole 22a. The air hole 22a avoids the generation of negative pressure in the valve chamber 22 and ensures smooth movement of the valve stem 23. The valve stem 23 is equipped with first and second seal rings 23a and 23b. The first and second seal rings 23a and 23b are airtightly in contact with the inner wall surface of the valve chamber 22. A third seal ring 22b is mounted on the inner wall surface of the valve chamber 22. The third seal ring 22b is airtightly slidably contacted with the outer peripheral surface of the large diameter portion 23c of the valve stem 23 between the first seal ring 23a and the second seal ring 23b.

The left end side of the valve stem 23 protrudes to the left from the inside of the valve chamber 22. Facing the left end of the valve stem 23, a flat plate-shaped duster button 21 is attached to the side of the tool body 2 so that the user can put his fingertip on it during operation. A compression spring 24 is interposed between the duster button 21 and the mouth of the valve chamber 22. The compression spring 24 urges the valve stem 23 to the off side (to the left in FIG. 7). FIG. 7 shows an off state of the air duster 20.

The valve chamber 22 is always in communication with the duster flow path 8b between the first seal ring 23a and the third seal ring 22b. The compressed air that has flowed into the valve chamber 22 via the duster flow path 8b is injected into the work site via the injection path 26 and the duster pipe 27. The duster pipe 27 is piped along the right side portion of the tool main body portion 2. Although not shown in the figure, the injection port of the duster pipe 27 is directed to the work site. When the duster button 21 is pushed against the compression spring 24, the valve stem 23 is displaced to the on side (to the right in FIG. 7). As a result, the third seal ring 22b is detached from the large diameter portion 23c, and the injection path 26 is communicated with the duster flow path 8b side, so that compressed air is injected from the duster pipe 27. When the pressing operation of the duster button 21 is released, the valve stem 23 moves to the off side by the compression spring 24. As a result, the injection path 26 is airtightly blocked from the duster flow path 8b side. Therefore, the injection of compressed air from the duster pipe 27 is stopped.

As shown in FIG. 4, a lubrication port 30 is provided on the side (right side portion) of the air duster 20 opposite to the duster button 21 in the left-right direction of the tool body 2. The lubrication port 30 is a right side portion of the tool main body portion 2 and is provided on the right side portion of the start valve chamber 15a (branch chamber) accommodating the start valve 7. The lubrication port 30 includes an lubrication hole 31 that opens inside the start valve chamber 15a and a lid 32 that closes the lubrication hole 31. The lubrication hole 31 is provided at the bottom of the cylindrical base portion 33 provided on the side portion of the tool main body portion 2. The opening diameter of the lubrication hole 31 is larger than the opening diameter of the air supply port of the hose connection portion 9 to which the air hose 9a is connected. This allows the oil to be dropped quickly and reliably. Further, as shown in FIG. 6, the lubrication hole 31 (lubrication port 30) is a portion deviated from the branch flow path 15b (a portion deviated in the circumferential direction) with respect to the position around the axis of the stem 7a (around the start valve 7). ). As a result, the oil content lubricated from the lubrication port 30 is less likely to flow back into the branch flow path 15b, or does not flow back.

The lid 32 is provided with a screw shaft portion 32a. The screw shaft portion 32a is screw-fitted to the bottom portion of the base portion 33, and the lid 32 is attached in a state of closing the lubrication hole 31. A seal ring 32b is attached to the base of the screw shaft portion 32a. As a result, the lubrication hole 31 is airtightly and oiltightly closed to the outside. A hexagonal hole 32c is provided in the head of the lid 32. A hexagon wrench (not shown) can be inserted into the hexagonal hole 32c to rotate the lid 32 in the opening direction and the closing direction.

By removing the lid 32, oil can be supplied to the lubrication hole 31 using, for example, a dropper 48 (see FIGS. 8 and 9). The lubrication hole 31 is opened with respect to the ventilation hole 7e of the start valve 7. As described above, compressed air is constantly supplied from the accumulator chamber 8 to the inner peripheral side of the second valve body 7c via the ventilation holes 7e. Therefore, the oil content dropped from the lubrication hole 31 is dispersed in the start valve 7 along with the flow of compressed air each time the start valve 7 is turned on. As a result, oil is supplied to the seal ring mounted on the outer peripheral surface of the valve stem 7a, the first seal ring 7f of the first valve body 7b, the second seal ring 7g, and the like, and the frictional resistance of each seal ring is reduced.

Further, the oil content refueled in the start valve 7 flows into the air supply / exhaust holes 7h and the air supply / exhaust passage 14. The oil that has flowed into the air supply / exhaust passage 14 is dispersed on the seal ring of the piston 10 and the inner peripheral surface of the cylinder 12 via the seal rings mounted on the inner week surface and the outer peripheral surface of the main body valve 13. As a result, the friction of each seal ring of the striking mechanism portion of the tool body portion 2 can be reduced.

According to the driving tool 1 of the present embodiment configured as described above, the branch flow path (valve flow path 15b) branched from the compressed air flow (main body flow path 8a) from the accumulator chamber 8 to the tool main body portion 2 is provided. The lubrication port 30 is arranged on the downstream side. Therefore, it is possible to prevent the oil component lubricated through the lubrication port 30 from flowing into the duster passage 8b. As a result, the air duster 20 can be made into dry air. According to the illustrated configuration, since the conventional dedicated plug or branch hose branched from the internal flow path is not used, the air duster 20 can be made into dry air with a simple configuration while avoiding high cost.

The oil content lubricated from the lubrication port 30 is lubricated mainly into the main body valve 13 and the cylinder 12 of the tool main body 2 via the start valve 7.

In the illustrated driving tool 1, the lubrication port 30 is provided on the right side portion (first side surface) of the tool body portion 2, and the duster button 21 (duster operation portion) is provided on the left side portion (second side surface). By arranging the lubrication port 30 on one first side surface and the duster operation unit on the other second side surface in a distributed manner with respect to the longitudinal direction (vertical direction) of the tool body 2, the configuration is such that they are centrally arranged on one side. In comparison, the degree of freedom of these arrangements is increased. In particular, by arranging the duster button 21 on the left side portion, the user can operate the duster button 21 with, for example, the thumb of the right hand holding the grip portion 3. As a result, the air duster 20 can be used while gripping the grip portion 3. On the other hand, since the lubrication work is performed when the driving tool 1 is not used, the lubrication port 30 is arranged on the right side portion where it is not necessary to consider the operability at the time of use. As a result, the empty space on the right side of the tool body 2 is effectively utilized.

The opening diameter of the inlet (lubrication hole 31) of the lubrication port 30 is larger than the opening diameter of the air supply port of the hose connection portion 9 to which the air hose 9a is connected. This ensures quick and reliable lubrication.

The lubrication port 30 has a removable lid 32. The lid 32 can be removed to lubricate the lubrication hole 31. A lid 32 is attached to prevent leakage of the lubricated oil.

Various changes can be made to the embodiments described above. For example, the portion where the lubrication port 30 is arranged can be changed to another portion, not limited to the side portion of the illustrated start valve 7. For example, with respect to the flow of the main body flow path 8a, a lubrication port may be provided in the main body flow path 8a on the downstream side of the duster flow path 8b (the portion 8c shown by the alternate long and short dash line in FIG. 6). This also prevents oil from flowing into the duster flow path 8b side. The oil lubricated to the main body flow path 8a is also dispersed in the cylinder 12 and through the main body valve 13 to the start valve 7.

Further, the lubrication port may be arranged at the portion where lubrication is directly applied to the air supply / exhaust passage 14 (the portion 14a shown by the alternate long and short dash line in FIG. 4). Compressed air is supplied and exhausted between the start valve 7 and the lower surface chamber 13b of the main body valve 13 via the air supply / exhaust passage 14. The main body valve 13 is closed by supplying compressed air from the start valve 7 to the lower surface chamber 13b. On the contrary, the compressed air in the lower surface chamber 13b is exhausted through the start valve 7 to open the main body valve 13. Since the compressed air flows in both directions through the air supply / exhaust passage 14 in this way, the oil content is dispersed in both the start valve 7 and the main body valve 13 by directly lubricating the air supply / exhaust passage 14. Also in this case, it is avoided that the oil content is dispersed in the air duster 20.

The lubrication port 30 can be changed to an automatic opening / closing type lubrication port 40. The lubrication port 40 according to the second embodiment is shown in FIGS. 8 and 9. The lubrication port 40 is housed in a frame recess 15c provided in the start valve chamber 15a of the main body housing 15. The lubrication port 40 includes a cylindrical frame body 41 fixed in the frame body recess 15c and an opening / closing piston 45.

The frame 41 is fixed to the frame recess 15c by a retaining ring 42 so as not to be detached. An insertion port 41a is provided on the right side portion of the frame body 41. A seal ring 43 is attached to the outer peripheral surface of the frame 41. As a result, the lubrication port 40 is airtightly and oiltly assembled to the start valve chamber 15a. A window portion 41b is provided on the left side portion of the frame body 41. The window portion 41b is formed by removing a region extending over a certain angle range in the circumferential direction of the frame body 41 from the left side portion in a U shape.

The opening / closing piston 45 is movably housed inside the frame 41. A seal ring 45a is attached to the outer peripheral surface of the frame 41. As a result, the space between the frame body 41 and the opening / closing piston 45 is hermetically and oiltly sealed. A compression spring 46 is interposed between the opening / closing piston 45 and the bottom of the frame recess 15c. As a result, the opening / closing piston 45 is urged to the right toward the insertion port 41a. When the opening / closing piston 45 is displaced to the left against the compression spring 46, the right side surface side and the left side surface side of the opening / closing piston 45 are communicated with each other through the window portion 41b. A lubrication hole 47 is provided at the bottom of the frame recess 15c. The lubrication hole 47 communicates with the ventilation hole 7e of the start valve 7.

As shown in FIG. 8, in the normal use state of the driving tool 1, the opening / closing piston 45 is held to the right by the urging force of the compression spring 46, and the lubrication port 40 is held in the closed state. In this closed state, the seal ring 45a is slidably contacted over the entire inner peripheral surface of the frame body 41, so that the inner peripheral side of the frame body 41 is maintained in an airtight and oiltight state.

A dropper 48 containing a required amount of oil is prepared for lubrication. As shown in FIG. 9, the nozzle tip portion of the dropper 48 is pressed against the opening / closing piston 45 via the insertion port 41a. As a result, the opening / closing piston 45 is pushed to the left against the compression spring 46. In this way, the opening / closing piston 45 is manually opened. When the opening / closing piston 45 is pushed to the left by a certain distance by the dropper 48, the seal ring 45a is disengaged from the inner peripheral surface of the frame 41 at the window portion 41b. As a result, the right side surface side and the left side surface side of the opening / closing piston 45 are in a state of communicating with each other.

With the open / close piston 45 pushed in in this way, oil is lubricated from the dropper 48. The lubricated oil component flows into the left side surface side of the opening / closing piston 45 through the window portion 41b of the frame body 41. The oil that has flowed into the left side surface of the opening / closing piston 45 flows into the start valve 7 through the lubrication hole 47 and the ventilation hole 7e.

After an appropriate amount of oil has been lubricated, the dropper 48 is taken out from the insertion port 41a. As a result, the opening / closing piston 45 is returned in the direction approaching the insertion port 41a by the urging force of the compression spring 46. As a result, the seal ring 45a is separated from the window portion 41b and is in a state of being slidably contacted over the entire inner peripheral surface of the frame body 41. As a result, the right side surface side and the left side surface side of the opening / closing piston 45 are returned to the state of being airtightly and oiltightly sealed. This prevents leakage (backflow) of the lubricated oil.

Regarding the lubrication port 40 according to the second embodiment, the arrangement portion thereof can be changed from the right side of the start valve 7 to the side of the air supply / exhaust passage 14 and the side of the main body flow path 8a.

The lubrication ports 30 and 40 according to the first and second embodiments may be arranged on the same side as the duster button 21 of the air duster 20.

The illustrated lubrication ports 30 and 40 can be applied not only to a nail driving machine but also to a compressed air driven screw driving machine.

W ... Driving material n ... Driving tool 1 ... Driving tool 2 ... Tool body 3 ... Grip part 4 ... Magazine 5 ... Driving nose part 5a ... Injection port, 5b ... Driving passage 5c ... Contact lever 6 ... Switch lever 7 ... Start valve 7a ... Valve stem, 7b ... 1st valve body, 7c ... 2nd valve body, 7d ... Compression spring 7e ... Vent hole, 7f ... 1st seal ring, 7g ... 2nd seal ring, 7h ... Supply / exhaust hole 8 ... Accumulation chamber 8a ... Main body flow path, 8b ... Duster flow path, 8c ... Site (another site where a lubrication port can be provided)
9 ... Hose connection 9a ... Air hose 10 ... Piston 11 ... Driver 12 ... Cylinder 12a ... Return air chamber, 12b ... Check valve, 12c ... Vent hole, 12d ... Cylinder upper chamber 13 ... Main body valve 13a ... Top chamber, 13b ... Bottom chamber, 13c ... Compression spring, 13d ... Exhaust chamber 14 ... Supply / exhaust passage 14a ... Part (another part where a lubrication port can be provided)
15 ... Main body housing 15a ... Starting valve chamber (branch chamber), 15b ... Valve flow path (branch flow path), 15c ... Frame recess 16 ... Exhaust passage 17 ... Feed mechanism 18 ... Top cap 18a ... Upper moving end damper 19 ... Lower moving end damper 20 ... Air duster 21 ... Duster button 22 ... Valve chamber 22a ... Atmospheric hole, 22b ... Third seal ring 23 ... Valve stem 23a ... First seal ring, 23b ... Second seal ring, 23c ... Large diameter part 24 ... Compression spring 26 ... Injection path 27 ... Duster pipe 30 ... Lubrication port (first embodiment)
31 ... Lubrication hole 32 ... Lid 32a ... Screw shaft portion, 32b ... Seal ring, 32c ... Hexagonal hole 33 ... Base portion 40 ... Lubrication port (second embodiment)
41 ... Frame body 41a ... Insertion port, 41b ... Window 42 ... Retaining ring 43 ... Seal ring 45 ... Opening and closing piston 45a ... Seal ring 46 ... Compression spring 47 ... Lubrication hole 48 ... Spoid

Claims (11)

It ’s a driving tool,
A driving mechanism that uses compressed air as a drive source,
The tool body with the driving mechanism inside and
The grip part protruding from the tool body part and
The accumulator chamber provided inside the grip portion and
A hose connection portion provided at the end of the grip portion and to which an air hose for supplying the compressed air to the accumulator chamber is connected.
The air duster that injects the compressed air and
A main body flow path that allows fluid communication between the accumulator chamber and the driving mechanism,
A duster flow path that is branched from the main body flow path and allows fluid communication with the air duster, and a duster flow path.
A driving tool having a lubrication port on the downstream side of the duster flow path or on the downstream side of the branch flow path branched from the main body flow path. The driving tool according to claim 1.
The lubrication port is a driving tool that opens into a branch chamber that communicates with the main body flow path through the branch flow path. The driving tool according to claim 2.
A switch lever provided on the tool body so that it can be moved,
A driving tool having a start valve linked to the switch lever and having the start valve housed in the branch chamber. The driving tool according to claim 1 or 2.
A switch lever provided on the tool body so that it can be moved,
The start valve linked to the switch lever and
It has a start valve chamber that accommodates the start valve and communicates with the main body flow path via the branch flow path.
A driving tool that opens into the start valve chamber at a portion where the lubrication port deviates from the branch flow path. The driving tool according to claim 1 or 2.
A switch lever provided on the tool body so that it can be moved,
The start valve linked to the switch lever and
A start valve chamber that accommodates the start valve and communicates with the main body flow path via the branch flow path.
It has a main body valve chamber that accommodates the main body valve of the driving mechanism and communicates with the start valve chamber via the air supply / exhaust passage.
A driving tool in which the lubrication port opens in the air supply / exhaust passage. The driving tool according to any one of claims 1 to 5.
When the longitudinal direction of the tool body portion is the vertical direction and the longitudinal direction of the grip portion is the front-rear direction, the lubrication port has an inlet that opens to the first side surface of any one of the left and right side surfaces of the tool body portion. Driving tool to have. The driving tool according to claim 6.
A driving tool having the lubrication port on the right side surface of the tool body. The driving tool according to claim 6.
A driving tool provided with a duster operating portion for operating the air duster on the second side surface of any one of the left and right side surfaces of the tool body portion. The driving tool according to any one of claims 1 to 8.
The hose connection portion has an air supply port into which compressed air flows in, and the hose connection portion has an air supply port.
A driving tool in which the opening diameter of the inlet of the lubrication port is larger than the opening diameter of the air supply port of the hose connection portion. The driving tool according to any one of claims 1 to 9.
A driving tool having a removable lid that closes the lubrication port. The driving tool according to claim 10.
A driving tool having a urging member that urges the lid to the closing side, and the lid is manually opened against the urging force of the urging member.

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