JP7205612B2 - hammer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening tool having a housing to which gas is supplied and a striking part that is operated by the pressure of the gas supplied inside the housing.

Patent Document 1 describes an example of a fastening tool having a gas chamber to which compressed gas is supplied and a striking portion that operates under the pressure of the compressed gas supplied to the gas chamber. The driving tool described in Patent Document 1 includes a housing, a handle, a cylinder, a head valve chamber, a cylinder upper chamber as a first gas chamber, a piston lower chamber as a second gas chamber, an accumulator, a striking portion, a trigger, It has a push lever, trigger valve, return chamber, passage, injection part, magazine, bumper and stopper.

A cylinder is movably disposed within the housing. A bumper is provided within the housing. The striking part has a piston and a driver blade. A piston is movable within the cylinder. The cylinder upper chamber is formed within the cylinder between the piston head valve. A piston lower chamber is formed between the piston and the bumper within the cylinder. A return chamber is formed outside the cylinder within the housing. A passageway is provided in the cylinder. A passage connects the cylinder lower chamber and the return chamber. A stopper is provided in the housing. Compressed gas is supplied to the accumulator from the outside of the housing. Compressed gas is enclosed in the piston lower chamber and the return chamber within the housing. The magazine contains the fasteners and the fasteners are fed to the ejection section.

When the user releases the operating force on at least one of the trigger and the push lever, the trigger valve supplies the compressed gas in the accumulator to the head valve chamber. A head valve is pressed against the cylinder, and isolates the pressure accumulation chamber from the piston upper chamber and connects the piston upper chamber to the outside of the housing. The piston is biased by the air pressure in the lower chamber of the cylinder, contacts the stopper, and stops at the top dead center.

When the user applies an operating force to the trigger and push lever, the trigger valve discharges the compressed gas in the head valve chamber to the outside of the housing. The head valve is separated from the cylinder by the air pressure in the pressure accumulation chamber, and the head valve connects the pressure accumulation chamber and the piston upper chamber and isolates the piston upper chamber from the outside of the housing. Compressed gas in the accumulator is supplied to the upper chamber of the piston, the striking part operates toward the bottom dead center, and the driver blade strikes the fastener in the injection path. When the piston moves toward the bottom dead center, the compressed gas in the piston lower chamber and return chamber is compressed and the pressure increases.

After the driver blade hits the fastener, the piston hits the bumper and the hitter stops at bottom dead center. When the user releases the operating force from at least one of the trigger and the push lever, the trigger valve supplies the compressed gas in the accumulator to the head valve chamber. The head valve isolates the pressure accumulation chamber from the piston upper chamber and connects the piston upper chamber to the outside of the housing. The striking part is urged by the air pressure in the lower chamber of the cylinder to rise from the bottom dead center, and when the piston contacts the stopper, the striking part stops at the top dead center.

JP 2013-43234 A

The inventors of the present application have recognized the problem that when the striking portion operates in the direction of striking the fastener, the pressure of the second gas chamber acts as an operating resistance to the striking portion, resulting in a loss of operating energy of the striking portion.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a driving tool capable of suppressing the loss of the actuation energy of the striking portion during the stroke in which the striking portion operates in the direction of striking the fastener.

The driving tool of one embodiment includes an operation member for applying and releasing an operation force by a user, and a first direction for hitting the fastener and a second direction opposite to the first direction. a first gas chamber to which gas is supplied when an operation force is applied to the operating member and to operate the striking portion in the first direction by gas pressure; and a housing with the second gas chamber formed therein, wherein the striking part operates in the first direction. an exhaust mechanism for exhausting the gas in the second gas chamber to the outside of the housing in a stroke; a return mechanism for supplying gas from the chamber to the second gas chamber to operate the striking portion in the second direction by the pressure of the second gas chamber.

The driving tool of one embodiment can suppress the loss of the actuation energy of the striking part in the stroke in which the striking part is operated in the direction of striking the fastener.

1 is a partial cross-sectional view of Embodiment 1 of the fastening tool according to the present invention, in which a striking portion is stopped at a standby position; FIG. 1 is a partial cross-sectional view of a cylinder and an injection part of the first embodiment of the fastening tool; FIG. Fig. 10 is a partial cross-sectional view of the first embodiment of the driving tool, with the striking part operating from the standby position; FIG. 4 is a partial cross-sectional view of a cylinder and an injection section corresponding to the fastening tool of FIG. 3; Fig. 10 is a partial cross-sectional view of the first embodiment of the driving tool in which the striking part has completed striking the fastener; 1 is a partial cross-sectional view of the first embodiment of the fastening tool, showing a state in which compressed air is exhausted from a cylinder upper chamber; FIG. 1 is a partial cross-sectional view of the first embodiment of the fastening tool, showing a state in which compressed air in the cylinder upper chamber flows into the cylinder lower chamber. FIG. Fig. 10 is a partial cross-sectional view of a second embodiment of the driving tool, showing a state in which the striking part is stopped at the standby position; FIG. 9 is a partial cross-sectional view of a cylinder and an injection part corresponding to the state of the fastening tool of FIG. 8; Fig. 10 is a partial cross-sectional view of the second embodiment of the driving tool, showing a state in which the striking part is operated from the standby position; FIG. 11 is a partial cross-sectional view of a cylinder and an injection part corresponding to the state of the fastening tool of FIG. 10; FIG. 10 is a partial cross-sectional view of the second embodiment of the driving tool, showing a state in which the striking part has completed striking the fastener. Fig. 10 is a partial cross-sectional view of the second embodiment of the fastening tool, showing a state in which compressed air is exhausted from the upper chamber of the cylinder; Fig. 10 is a partial cross-sectional view of the second embodiment of the tool, showing a state in which compressed air in the upper chamber of the cylinder flows into the lower chamber of the cylinder; FIG. 4 is a diagrammatic view of an example in which an embodiment of a fastening tool and a comparative example of a fastening tool are compared;

Next, among several embodiments included in the fastening tool of the present invention, a representative fastening tool will be described with reference to the drawings.

(Embodiment 1) Embodiment 1 of the fastening tool will be described with reference to FIGS. 1 to 7. FIG. The driving tool 10 has a housing 11 , a cylinder 12 , a striking portion 13 , a trigger 14 , an ejection portion 15 and a push lever 16 . A magazine 17 is also provided to be attached to the tool 10 . The housing 11 has a cylindrical body 18 , a head cover 19 fixed to the body 18 , and a handle 20 connected to the body 18 .

A pressure accumulation chamber 21 is formed over the inside of the handle 20 , the inside of the body portion 18 and the inside of the head cover 19 . An air hose is connected to the handle 20 . Compressed air as compressed gas is supplied into the pressure accumulation chamber 21 through an air hose. The cylinder 12 is provided in the trunk|drum 18 and the head cover 19 as an example. The cylinder 12 is provided so as not to move in the direction along the center line A1.

A stopper 22 is attached to the head cover 19 . The stopper 22 is made of synthetic rubber as an example. An exhaust passage 23 is formed between the stopper 22 and the head cover 19 . The exhaust path 23 is connected to the outside B1 of the housing 11 . A head valve 24 is provided within the head cover 19 . The head valve 24 is made of synthetic rubber and is movable in the direction along the center line A1 of the cylinder 12 . The head valve 24 is annular and has a sealing lip 25 and a sleeve 26 . A seal lip 25 is formed on the outer peripheral surface of the head valve 24 . A head valve chamber 27 is formed between the head valve 24 and the head cover 19 , and the seal lip 25 hermetically seals the head valve chamber 27 . The head valve 24 is biased away from the cylinder 12 by the pressure in the pressure accumulation chamber 21 .

A biasing member 28 is provided between the stopper 22 and the head valve 24 . The biasing member 28 is, for example, a metal compression spring. The biasing member 28 biases the head valve 24 toward the cylinder 12 in the direction along the center line A1.

The striking part 13 has a piston 29 and a driver blade 30 fixed to the piston 29 . A piston 29 is arranged within the cylinder 12 . The striking part 13 is operable in a first direction E1 and a second direction E2 along the center line A1, that is, it is translatable. The second orientation E2 is opposite to the first orientation E1. A first orientation E1 can be defined as downward in FIG. A second orientation E2 can be defined as rising in FIG. A seal member 31 is attached to the outer peripheral surface of the piston 29 .

A piston upper chamber 32 is formed within the cylinder 12 between the head valve 24 and the piston 29 . The head valve 24 is pressed against the end of the cylinder 12 by the force of the biasing member 28 as shown in FIG. A sleeve 26 connects the piston upper chamber 32 and the exhaust passage 23 .

When the head valve 24 is separated from the end of the cylinder 12 as shown in FIG. 3, the head valve 24 connects the piston upper chamber 32 and the pressure accumulation chamber 21 . A sleeve 26 connects the piston upper chamber 32 and the exhaust passage 23 .

As shown in FIG. 2, the injection section 15 is fixed to the body section 18 . The injection part 15 is in contact with the end of the cylinder 12 in the direction along the center line A1. An annular bumper 33 is provided within the cylinder 12 . A portion of the bumper 33 is in contact with the injection section 15 . The bumper 33 is made of synthetic rubber or silicon rubber. The bumper 33 has an axial hole 34, and the driver blade 30 can move in the axial hole 34 along the center line A1. A piston lower chamber 35 is formed between the piston 29 and the bumper 33 in the cylinder 12 . The seal member 31 airtightly separates the piston lower chamber 35 and the piston upper chamber 32 .

A bulkhead 36 is provided within the body 18 . The partition 36 is annular. The partition wall 36 is arranged so as to surround the outer circumference of the cylinder 12 . Passages 37 and 38 are provided radially through the cylinder 12 . The passages 37, 38 are arranged between the partition wall 36 and the injection section 15 in the direction along the centerline A1. A plurality of passages 37 and 38 are provided at intervals in the circumferential direction of the cylinder 12 .

The passage 37 is arranged between the partition wall 36 and the injection section 15 in the direction along the centerline A1. The passage 38 is arranged between the passage 37 and the injection section 15 in a direction along the centerline A1. A sleeve 39 is provided within the barrel 18 . A sleeve 39 is arranged between the barrel 18 and the cylinder 12 and the sleeve 39 is arranged concentrically with the cylinder 12 . The sleeve 39 is operable relative to the body 18 and cylinder 12 in a direction along the centerline A1.

A passageway 40 is formed between the sleeve 39 and the cylinder 12 . The passage 40 is annularly formed outside the cylinder 12 in the radial direction of the cylinder 12 . Sealing members 41 and 42 are provided between the sleeve 39 and the cylinder 12 and seal the passage 40 airtightly. A biasing member 43 is provided in the passageway 40 . The biasing member 43 is, for example, a metal compression spring. The biasing member 43 biases the sleeve 39 toward the injection part 15 in the direction along the center line A1.

A control chamber 44 and a control chamber 45 are formed in the body 18 . A control chamber 44 is formed between the body 18 and the cylinder 12 . The partition wall 36 separates the control chamber 44 and the pressure accumulation chamber 21 . Compressed air is supplied to the control chamber 44 . When compressed air is supplied to the control chamber 44, the sleeve 39 is urged toward the injection section 15 in a direction along the centerline A1.

As shown in FIG. 4, the control chamber 45 is formed between the body 18 and the cylinder 12 . The control chamber 45 is arranged between the injection section 15 and the sleeve 39 in a direction along the centerline A1. A passage 46 is provided in the body portion 18 , and the passage 46 always connects the accumulator chamber 21 and the control chamber 45 . A part of the compressed air supplied to the pressure accumulation chamber 21 through the air hose flows into the control chamber 45 through the passage 46 . The sleeve 39 is biased away from the injection section 15 by the pressure in the control chamber 45 .

A passageway 47 is provided radially through the sleeve 39 . A plurality of passages 47 are provided at intervals in the circumferential direction of the sleeve 39 . An exhaust chamber 48 is provided between the barrel 18 and the sleeve 39 . An exhaust passage 80 is provided through the body 18 . The exhaust path 80 always connects the exhaust chamber 48 and the outside B1. A plurality of exhaust passages 80 are provided at intervals around the entire circumference of the body portion 18 . Actuation of the sleeve 39 in a direction along the centerline A1 connects the underpiston chamber 35 to either the passageway 40 or the exterior B1.

A valve 49 is attached to the outer peripheral surface of the cylinder 12 . The valve 49 is a ring made of synthetic rubber and is elastically deformable in the radial direction of the cylinder 12 . Air in cylinder 12 flows through passage 37 into passage 40 when valve 49 is opened by air pressure in passage 37 . When valve 49 is closed, valve 49 prevents air in passage 40 from flowing into cylinder 12 . Valve 49 can be defined as a check valve.

As shown in FIG. 2, trigger 14 is mounted on housing 11 . The trigger 14 is rotatable about the support shaft 50 with respect to the housing 11 within a predetermined angle range. Arm 51 is attached to trigger 14 . Arm 51 is operable about support shaft 52 with respect to trigger 14 .

As shown in FIG. 1, a trigger valve 53 is provided at the connection point between the barrel 18 and the handle 20 . The trigger valve 53 has a plunger 54 , a body 55 , a valve body 56 and a biasing member 57 . Both the body 55 and the valve body 56 are cylindrical, and the body 55 and the valve body 56 are arranged concentrically about the center line A2. A valve body 56 is disposed within the body 55 and is operable with respect to the body 55 in a direction along the center line A2.

The plunger 54 is arranged within the valve body 56 . Body 55 has a passageway 58 . A passageway 59 is provided in the housing 11 . Passage 58 is connected to head valve chamber 27 via passage 59 . The passageway 58 is also connected to the control chamber 44 . Furthermore, an exhaust passage 60 is provided between the body 55 and the valve body 56 . The exhaust path 60 is connected to the outside B1. The biasing member 57 is, for example, a compression spring, and biases the plunger 54 toward the arm 51 in the direction of the center line A2.

The ejection portion 15 has a tubular portion 61 and a flange 81 connected to the outer peripheral surface of the tubular portion 61 . Flange 81 is fixed to barrel 18 by a fixing element. The tubular portion 61 has an injection path 62 . A centerline A<b>1 is positioned within the injection path 62 , and the driver blade 30 is movable within the injection path 62 in a direction along the centerline A<b>1 . The inner surface of the cylindrical portion 61 contacts the outer peripheral surface of the driver blade 30 to prevent the air in the piston lower chamber 35 from leaking to the injection path 62 .

The magazine 17 is fixed to the injection section 15 . Magazine 17 accommodates nails 63 . The magazine 17 has a feeder 64 that feeds the nails 63 in the magazine 17 to the ejection path 62 .

The push lever 16 is operable within a predetermined range in the direction along the center line A1 with respect to the ejection portion 15. As shown in FIG. A shaft member 65 is connected to the push lever 16 so as to be able to transmit power. The operating force of the push lever 16 is transmitted to the shaft member 65 . The shaft member 65 is biased away from the arm 51 by a biasing member 66 . The biasing member 66 is, for example, a compression spring.

Next, an example of driving the nail 63 into the mating member 67 using the driving machine 10 will be described. When at least one of releasing the operating force on the trigger 14 and separating the push lever 16 from the mating material 67 is performed, the trigger valve 53 and the head valve 24 of the driving tool 10 Each is in its initial state. Also, the striking part 13 is stopped at the standby position.

The trigger valve 53 has a valve body 56 that connects the pressure accumulation chamber 21 and the passage 58 and blocks the passage 58 and the exhaust passage 60 . Compressed air in the pressure accumulation chamber 21 is supplied to the head valve chamber 27 . The head valve 24 is pressed against the end of the cylinder 12 by the biasing force of the biasing member 28 and the pressure of the head valve chamber 27 . The head valve 24 isolates the piston upper chamber 32 and the pressure accumulation chamber 21 . Further, the head valve 24 connects the piston upper chamber 32 and the outside B1. The pressure in the piston upper chamber 32 is the atmospheric pressure, and the piston 29 is urged by the pressure in the piston lower chamber 35 to contact the head valve 24 . Therefore, the striking part 13 is stopped at the standby position, that is, at the top dead center.

A portion of the compressed air in the accumulator chamber 21 is supplied to the control chamber 44 through the passage 58 . A part of the compressed air in the pressure accumulation chamber 21 is supplied to the control chamber 45 through the passage 46 . Sleeve 39 receives the biasing force of biasing member 43, the pressure in control chamber 44, and the pressure in control chamber 45, as shown in FIG. The sleeve 39 is pressed against the flange 81 by the biasing force corresponding to the difference between the pressure receiving area in the control chamber 44 and the pressure receiving area in the control chamber 45 and the biasing force of the biasing member 43, and the sleeve 39 stops at the standby position. ing. When the sleeve 39 is in the standby position, the sleeve 39 connects the piston lower chamber 35 and the passage 40 via the passage 38 and blocks the piston lower chamber 35 from the outside B1.

Next, when the user applies an operating force to the trigger 14 and presses the push lever 16 against the mating member 77 , the operating forces of the trigger 14 and the push lever 16 are transmitted to the plunger 54 . The plunger 54 operates against the biasing force of the biasing member 57, and the trigger valve 53 switches from the initial state to the operating state. When the trigger valve 53 is activated, the valve body 56 blocks the pressure accumulation chamber 21 and the passage 58 and connects the passage 58 and the exhaust passage 60 .

Therefore, the compressed air in the head valve chamber 27 is exhausted to the outside B1 through the passage 59 and the exhaust path 60 . The head valve 24 operates against the biasing force of the biasing member 28 by the pressure in the pressure accumulation chamber 21 . For this reason, the head valve 24 connects the piston upper chamber 32 and the pressure accumulation chamber 21 and blocks the piston upper chamber 32 and the exhaust passage 23 as shown in FIG.

Then, the pressure in the piston upper chamber 32 increases, and the striking part 13 moves from the top dead center to the bottom dead center along the center line A1. The driver blade 30 hits the nail 63 in the injection path 62 as shown in FIG.

Also, when the trigger valve 53 is activated, the compressed air in the control chamber 44 is discharged to the outside B1 through the passage 58 and the exhaust passage 60 . Then, the pressure in the control chamber 45 causes the sleeve 39 to move away from the injection section 15 against the biasing force of the biasing member 43 . The sleeve 39 stops at the exhaust position shown in FIG. When the sleeve 39 is in the exhaust position, the sleeve 39 blocks the piston lower chamber 35 and the passage 40 and connects the piston lower chamber 35 and the outside B1 via the passages 38,47. In addition, the inner surface of the sleeve 39 is pressed against the valve 49, preventing the valve 49 from elastically deforming outward in the radial direction. That is, the sleeve 39 keeps the valve 49 closed to the passage 37 .

Therefore, when the striking portion 13 moves from the top dead center toward the bottom dead center and the pressure in the piston lower chamber 35 rises, the air in the piston lower chamber 35 flows through the passage 38 , the exhaust chamber 48 and the exhaust passage 80 . It passes through and is discharged to the outside B1. The sleeve 39 holds the passageway 37 closed by the valve 49 so that the air in the underpiston chamber 35 does not flow through the passageway 37 into the passageway 40 .

Then, as shown in FIG. 5 , the piston 29 collides with the bumper 33 after the driver blade 30 completes driving the nail 63 into the mating member 67 . The bumper 33 absorbs part of the kinetic energy of the striking part 13, and the striking part 13 stops at the bottom dead center. When the trigger valve 53 is held in the actuated state when the striking portion 13 reaches the bottom dead center, the control chamber 44 is connected to the outside B1 of the housing 11 through the passage 58 . Therefore, the sleeve 39 is stopped at the exhaust position as shown in FIG.

After the striking part 13 reaches the bottom dead center, when the user releases the operating force on the trigger 14 or separates the push lever 16 from the mating member 67, the trigger valve 53 It switches from the active state to the initial state. Then, the compressed air in the pressure accumulation chamber 21 is supplied to the head valve chamber 27 through the passage 59 . The head valve 24 is pressed against the end of the cylinder 12 as shown in FIG.

Also, when the trigger valve 53 is switched from the operating state to the initial state, the compressed air in the pressure accumulation chamber 21 is supplied to the control chamber 44 through the passage 58 . Then, the sleeve 39 is moved toward the injection section 15 by the pressure of the control chamber 44 and the biasing force of the biasing member 43, and the sleeve 39 stops at the standby position.

When the sleeve 39 stops at the standby position, the sleeve 39 separates from the outer peripheral surface of the valve 49 as shown in FIGS. Thus, valve 49 opens passageway 37 with air pressure in piston upper chamber 32 , and a portion of the air in piston upper chamber 32 flows through passageways 37 , 40 and 38 into piston lower chamber 35 . The opening area of the passage 37 is wider than the opening area of the exhaust path 23 . Therefore, the amount of air flowing from the piston upper chamber 32 through the passage 37 into the piston lower chamber 35 is larger than the air amount discharged from the piston upper chamber 32 through the exhaust passage 23 to the outside B1.

The striking portion 13 moves from the bottom dead center to the top dead center by the pressure in the piston lower chamber 35, and part of the air in the piston upper chamber 32 is discharged to the outside B1 through the exhaust passage 23. When the piston 29 contacts the head valve 24 as shown in FIG. 1, the striking portion 13 stops at the top dead center.

The driving tool 10 operates in the direction in which the striking part 13 strikes the nail 63, that is, in the first direction E1. As shown in FIG. 80 to the outside B1. Therefore, it is possible to suppress an increase in pressure in the piston lower chamber 35 during the stroke in which the striking portion 13 operates in the first direction E1. Therefore, the loss of the actuation energy of the striking portion 13 can be suppressed. Moreover, in order to set the operating energy of the striking portion 13 to a target value, it is possible to reduce the amount of compressed air supplied to the pressure accumulation chamber 21 or to reduce the volume of the pressure accumulation chamber 21 .

6 and 7, part of the air in the piston upper chamber 32 flows into the piston lower chamber 35 through the passages 37, 40 and 38, thereby The part 13 operates from the bottom dead center toward the top dead center. Therefore, the passage 40 only needs to have a volume through which air can pass. In other words, the passageway 40 does not require an air storage volume to generate the pressure to move the striking portion 13 from the bottom dead center to the top dead center. Therefore, the fastening tool 10 can prevent the housing 11 from increasing in size in the radial direction about the center line A1 or in the direction along the center line A1. Further, the tool 10 can have reduced air consumption.

When the user releases the operating force on the trigger 14 or separates the push lever 16 from the mating member 67, the compressed air is discharged from the control chamber 44 and the sleeve 39 is moved to the exhaust position. to the standby position, and the striking part 13 moves from the bottom dead center to the top dead center.

Further, in a state in which the operating force on the trigger 14 is released and the push lever 16 is separated from the mating member 67, the sleeve 39 blocks the piston lower chamber 35 and the exhaust passage 80 as shown in FIG. Stopped at the standby position. Therefore, the impacting portion 13 is reliably stopped at the top dead center by the pressure in the piston lower chamber 35 .

(Embodiment 2) Embodiment 2 of the fastening tool will be described with reference to FIGS. 8 and 9. FIG. The driving tool 100 has a housing 101 , an injection part 102 , a striking part 103 , a push lever valve 104 and a trigger valve 105 . Housing 101 has body 106 , handle 107 and head cover 108 . A trunk portion 106 has a cylindrical shape, and a handle 107 is connected to the trunk portion 106 . A head cover 108 is fixed to the longitudinal first end of the body 106 . In addition, the injection section 102 is fixed to the second end portion of the body section 106 in the longitudinal direction. An air hose is connected to the handle 107 . The hitting portion 103 is provided inside the body portion 106 . The striking part 103 is operable, ie translatable, in a first direction E1 and a second direction E2 along the centerline C1.

A cylinder 109 is provided within the body portion 106 . A centerline C1 is the centerline of the cylinder 109 . The cylinder 109 is movable relative to the housing 101 in the direction along the centerline C1. A pressure accumulation chamber 110 is provided throughout the handle 107 , body portion 106 and head cover 108 . Compressed air enters the accumulator chamber 110 through an air hose.

A mount portion 115 is provided within the head cover 108 and a valve seat 119 is attached to the mount portion 115 . Valve seat 119 has a passageway 117 . Head cover 108 has an exhaust passage 112 and an exhaust valve chamber 114 . The exhaust path 112 is connected to the exterior D1 of the housing 101 . Mount portion 115 supports exhaust valve 118 . The exhaust valve 118 is movable relative to the mount portion 115 in the direction along the center line C1. Exhaust valve 118 opens and closes passage 117 . A valve seat 119 is attached to the mount portion 115 . The valve seat 119 is made of synthetic rubber and has an annular shape.

The hitting part 103 has a piston 121 and a driver blade 122 . A piston 121 is provided within the cylinder 109, and the piston 121 is operable within the cylinder 109 in a direction along the centerline C1. A piston upper chamber 120 is formed between the mount portion 115 and the piston 121 in the cylinder 109 .

The pressure in piston upper chamber 120 is applied to piston 121 . The striking portion 103 is biased away from the valve seat 119 in the direction along the center line C1 by the pressure in the piston upper chamber 120 . A seal member 121A is attached to the outer peripheral surface of the piston 121 . 121 A of sealing members contact the internal peripheral surface of the cylinder 109. As shown in FIG.

Additionally, a bumper 128 is provided within the body 106 . The bumper 128 is provided between the piston 121 and the ejection portion 102 in a direction along the centerline C1. The bumper 128 is a cushioning member made of synthetic rubber. Bumper 128 has a shaft hole 129 . A bumper 128 contacts the injection section 102 and a portion of the bumper 128 is located within the cylinder 109 . Of the ends of the cylinder 109 in the direction along the center line C<b>1 , the ends located near the bumper 128 can contact and separate from the bumper 128 .

A piston lower chamber 123 is provided between the piston 121 and the ejection portion 102 in the direction of the center line C1 in the cylinder 109 . The seal member 121A airtightly separates the piston upper chamber 120 and the piston lower chamber 123 from each other.

Body 106 and cylinder 109 form passageway 124 . A passage 124 is formed between the inner surface of the barrel 106 and the outer surface of the cylinder 109 . The passage 124 is annularly formed outside the cylinder 109 in the radial direction of the cylinder 109 .

Passages 125 and 126 are provided radially through the cylinder 109 . Passage 125 is located between valve seat 119 and injection section 102 in a direction along centerline C1. A plurality of passages 125 are provided at intervals in the circumferential direction of the cylinder 109 . The passageway 126 is located between the passageway 125 and the injection section 102 in the direction along the centerline C1. A valve 127 is attached to the outer circumference of the cylinder 109 . The valve 127 is, for example, a synthetic rubber ring. The valve 127 is elastically deformable in the radial direction of the cylinder 109 and opens and closes the passage 125 . When valve 127 opens passage 125 , air within cylinder 109 flows through passage 125 to passage 124 . When valve 127 closes passage 125 , valve 127 prevents air in passage 124 from flowing into cylinder 109 . Valve 127 can be defined as a check valve.

Furthermore, a storage chamber 200 is formed between the body portion 106 and the cylinder 109 . The accommodation chamber 200 is formed outside the cylinder 109 in the radial direction of the cylinder 109 . A biasing member 130 is provided in the accommodation chamber 200 . The containing chamber 200 is connected to the passageway 124 . The biasing member 130 biases the cylinder 109 toward the valve seat 119 along the center line C1. The biasing member 130 is, for example, a metal compression spring.

The trunk 106 has an exhaust path 201 . The exhaust path 201 radially penetrates the body portion 106 . A plurality of exhaust passages 201 are provided at intervals in the circumferential direction of the body portion 106 . The exhaust path 201 is connected to the outside D1.

The injection section 102 has a flange 131 , a tubular section 132 and an injection path 133 . The flange 131 is fixed to the body portion 106 and the flange 131 is connected to the tubular portion 132 . The injection path 133 is formed inside the cylindrical portion 132 . The injection path 133 is connected to the shaft hole 129 . The driver blade 122 is movable in the axial hole 129 and the injection path 133 in the direction along the centerline C1. The inner surface of the cylindrical portion 132 contacts the outer surface of the driver blade 122 to prevent the air in the piston lower chamber 123 from leaking to the injection path 133 .

A push lever 134 is attached to the ejection section 102, and the push lever 134 is movable relative to the ejection section 102 in a direction along the center line C1. Push lever 134 is connected to shaft member 166 .

A holder 135 is provided within the body 106 . The holder 135 has an annular shape and is arranged outside the cylinder 109 in the radial direction of the cylinder 109 . The holder 135 does not move relative to the body 106 along the centerline C1. The holder 135 has a passage 136 which is connected to the accumulator chamber 110 . Holder 135 separates passage 124 and control chamber 139 . Flanges 137 and 138 are provided on the outer peripheral surface of the cylinder 109 . The flanges 137, 138 are arranged at different positions in the direction along the centerline C1. A control chamber 139 is provided between the cylinder 109 and the holder 135 and between the flanges 137 and 138 . Passage 136 connects control chamber 139 and pressure accumulation chamber 110 .

A partition wall 140 is provided in the body portion 106 and is provided so as to surround the outer circumference of the cylinder 109 . Partition 140 is annular, and control chamber 141 is formed between partition 140 and flange 137 . A partition wall 140 separates the control chamber 141 and the pressure accumulation chamber 110 .

Flange 137 receives pressure from control chamber 141 and control chamber 139 , and flange 138 receives pressure from control chamber 139 . Therefore, the pressure in the control chamber 141 and the control chamber 139 urges the cylinder 109 in the direction along the center line C1.

The trigger valve 105 and push lever valve 104 have the following structures. Push lever valve 104 has pressure chamber 180 , plunger 144 , valve body 145 , valve member 146 and biasing member 147 . The biasing member 147 is, for example, a metal compression spring, and biases the valve member 146 . The valve body 145 has a passage 143 and an exhaust passage 161 . A passageway 160 is provided through the barrel 106 and the head cover 108 and leads to the control chamber 141 and the passageway 143 . The exhaust path 161 is connected to the outside D1. A biasing member 162 is provided to bias the plunger 144 . The biasing member 162 is, for example, a metal spring.

A trigger 148 is attached to the housing 101 . Trigger 148 is rotatable about trigger axis 149 within a predetermined angle range. The trigger valve 105 has a cylindrical guide portion 151 , a ball-shaped valve member 155 and a plunger 157 . The guide portion 151 is attached to the handle 107 . Plunger 157 is operable with respect to guide portion 151 .

A magazine 169 containing a plurality of nails 168 is attached to the ejection section 102 . Each time the driver blade 122 drives a nail 168 , the next nail 168 is fed from the magazine 169 into the ejection path 133 .

A usage example of the fastening tool 100 will be described. The trigger valve 105 and the push lever valve 104 are in the initial state when at least one of the operation force on the trigger 148 is released and the push lever 134 is separated from the mating member 170. .

The trigger valve 105 in the initial state isolates the accumulator chamber 110 and the pressure chamber 180 . The push lever valve 104 in the initial state isolates the pressure chamber 180 and the passage 143 and connects the passage 143 and the exhaust passage 161 . Therefore, the compressed air in the exhaust valve chamber 114 and the compressed air in the control chamber 141 are discharged from the passages 160 and 143 and the exhaust path 161 to the outside D1. Also, the exhaust valve 118 opens the passage 117 .

The cylinder 109 is biased toward the valve seat 119 in the direction of the center line C1 by the pressure in the control chamber 139 and the biasing force of the biasing member 130 . The cylinder 109 is stopped at the standby position pressed against the valve seat 119 as shown in FIG. Cylinder 109 stopped at the standby position isolates pressure accumulation chamber 110 from piston upper chamber 120 .

When the cylinder 109 is stopped at the standby position, the piston upper chamber 120 is connected to the outside D1 by the passage 117 and the exhaust passage 112 . Further, the cylinder 109 stopped in the initial state blocks the passage 126 and the exhaust passage 201 as shown in FIG. The striking portion 103 is biased toward the valve seat 119 by the pressure of the piston lower chamber 123 . The piston 121 is pressed against the valve seat 119 as shown in FIG. 8, and the striking portion 103 is stopped at the top dead center.

When the user applies an operating force to the trigger 148 and pushes the push lever 134 against the mating member 170, the operating force of the trigger 148 switches the trigger valve 105 from the initial state to the operating state. Also, the push lever valve 104 switches from the initial state to the operating state. The activated trigger valve 105 connects the accumulator chamber 110 and the pressure chamber 180 . Further, the activated push lever valve 104 blocks the exhaust passage 161 and the passage 143 and connects the passage 143 and the pressure chamber 180 .

Therefore, the compressed air in the accumulator chamber 110 is supplied to the exhaust valve chamber 114 via the pressure chamber 180 and the passage 160 . Exhaust valve 118 closes passageway 117 . That is, the piston upper chamber 120 and the exhaust passage 112 are blocked. Also, part of the compressed air in passage 160 is supplied to control chamber 141 via passage 142 .

Then, the pressure in the control chamber 141 and the control chamber 139 causes the cylinder 109 to move away from the valve seat 119 in the direction along the center line C1 against the force of the biasing member 130 . Therefore, as shown in FIG. 10, the pressure accumulation chamber 110 is connected to the piston upper chamber 120 . Compressed air flows from the accumulator chamber 110 into the piston upper chamber 120, and the pressure in the piston upper chamber 120 increases. Further, the cylinder 109 separated from the valve seat 119 stops at the exhaust position in contact with the bumper 128 shown in FIG.

The striking part 103 is actuated in a direction away from the valve seat 119 by the pressure of the piston upper chamber 120 . In this manner, the striking portion 13 moves from the top dead center toward the bottom dead center. Driver blade 122 strikes nail 168 in injection path 133 as shown in FIG.

When cylinder 109 stops at the exhaust position, the inner surface of barrel 106 presses against valve 127 . That is, the trunk portion 106 prevents the valve 127 from being elastically deformed by the pressure of the passage 125 , and the trunk portion 106 maintains the state in which the valve 127 closes the passage 125 . Also, the cylinder 109 stopped at the exhaust position connects the passage 126 and the exhaust path 201 . Therefore, the air in the piston lower chamber 123 flows through the passage 126 and the exhaust passage 201 to the outside during the stroke in which the striking portion 13 moves from the top dead center to the bottom dead center, that is, moves in the first direction E1. It is discharged to D1.

After the operation of driving the nail 168 into the mating member 170 is completed, the piston 121 collides with the bumper 128 and the striking portion 103 stops at the bottom dead center as shown in FIG. Bumper 128 absorbs the kinetic energy of striking portion 103 .

After the striking portion 103 reaches the bottom dead center, the user releases the operating force of the trigger 148 or separates the push lever 134 from the mating member 170 . Then, the trigger valve 105 switches from the operating state to the initial state, and the push lever valve 104 switches from the operating state to the initial state. Therefore, the compressed air in the exhaust valve chamber 114 and the control chamber 141 is discharged through the passage 160 and the exhaust path 161 to the outside D1. Exhaust valve 118 thus opens passage 117 as shown in FIG. Also, the cylinder 109 operates in a direction approaching the valve seat 119 due to the pressure in the control chamber 139 and the biasing force of the biasing member 130 . When the cylinder 109 comes into contact with the valve seat 119 and stops at the standby position, the cylinder 109 blocks the pressure accumulation chamber 110 and the piston upper chamber 120 as shown in FIG.

Further, when the cylinder 109 stops at the standby position, the cylinder 109 connects the passage 126 and the storage chamber 200 and blocks the passage 126 and the exhaust passage 201 as shown in FIG. Further, when the cylinder 109 stops at the standby position, the inner surface of the body portion 106 is separated from the valve 127 as shown in FIG. That is, the valve 127 is elastically deformed by the pressure inside the passage 125 to open the passage 125 . The ventilation area of the plurality of passages 125 is larger than the ventilation area of the passages 117 . Therefore, the amount of air discharged from the piston upper chamber 120 through the passage 125 to the passage 124 is larger than the amount of air discharged from the piston upper chamber 120 through the passage 117 and the exhaust passage 112 to the outside D1.

The air discharged to the passage 124 flows into the piston lower chamber 123 through the housing chamber 200 and the passage 126 . The striking part 103 is operated from the bottom dead center toward the top dead center by the pressure of the piston lower chamber 123 . When the piston 121 contacts the valve seat 119 as shown in FIG. 8, the striking portion 103 stops at the top dead center.

In the driving tool 100, the striking part 103 is operated in the first direction E1 as shown in FIG. 10, and as shown in FIG. It is discharged to the outside D1. Therefore, it is possible to suppress an increase in pressure in the piston lower chamber 123 in the stroke in which the striking portion 103 operates in the first direction E1. Therefore, the loss of the actuation energy of the striking portion 103 can be suppressed. In addition, the amount of compressed air supplied to the pressure accumulating chamber 110 can be reduced in order to set the operating energy of the striking portion 103 to the target value.

13 and 14, part of the air in the piston upper chamber 120 flows into the piston lower chamber 123 through passages 124 and 126, so that the striking part 103 is It works from bottom dead center to top dead center. Therefore, the passage 124 only needs to have a volume through which air can pass. In other words, the passageway 124 does not require an air storage volume to create the pressure to actuate the striking portion 103 from bottom dead center to top dead center. Therefore, the fastening tool 100 can prevent the housing 101 from increasing in size in the radial direction about the center line C1 or in the direction along the center line C1. Further, the fastening tool 100 can reduce the air consumption or reduce the volume of the pressure accumulation chamber 110 .

When the user releases the operating force on the trigger 148 or separates the push lever 134 from the mating member 170, compressed air is discharged from the control chamber 141 and the cylinder 109 is moved to the exhaust position. to the standby position, and the striking part 103 moves from the bottom dead center to the top dead center. Furthermore, in a state where the operating force on the trigger 148 is released and the push lever 134 is separated from the mating member 170, the cylinder 109 blocks the piston lower chamber 123 and the exhaust passage 201 as shown in FIG. Stopped at the standby position. Therefore, the striking portion 103 is reliably stopped at the top dead center by the pressure in the piston lower chamber 123 .

FIG. 15 is an example of a diagram comparing an embodiment of the fastening tool and a comparative example of the fastening tool. The characteristics of the comparative example of the tool are shown in the left half of FIG. Characteristics of an embodiment of the tool are shown in the right half of FIG. The passage shown in FIG. 15 corresponds to the passages 40,124. The return chamber shown in FIG. 15 is a space for storing compressed air in order to return the striking part from the bottom dead center toward the top dead center.

The striking part is positioned at the bottom dead center at time T1, and the striking part is positioned at the top dead center at time T2. It can be seen that the maximum value of the passage pressure in the embodiment is lower than the maximum value of the return chamber pressure in the comparative example. This is because, in the embodiment of the fastening tool, the air in the lower chamber of the cylinder is discharged outside the housing without flowing into the passage during the stroke in which the striking part moves from the top dead center to the bottom dead center. be.

It can be seen that the maximum value of air consumption in the embodiment is lower than the maximum value of air consumption in the comparative example. This is because the embodiment of the tool does not require a compressed air storage volume to obtain the pressure to move the striking part from the bottom dead center to the top dead center.

It can be seen that the maximum value of impact energy in the embodiment is higher than the maximum value of impact energy in the comparative example. This is because, in the embodiment of the fastening tool, the air in the lower chamber of the piston is discharged to the outside of the housing during the stroke of moving the striking part from the top dead center to the bottom dead center.

An example of the technical meaning of the items described in some embodiments is as follows. The fastening tools 10 and 100 are examples of fastening tools. The striking portions 13 and 103 are examples of striking portions. Triggers 14, 148 and push levers 16, 134 are examples of operating members. Each of push levers 16 and 134 is an example of a contact element.

In this embodiment, "the user applies and releases the operation force" means that the user touches the operation member with a part of the body to release and apply the operation force, and that the user touches the operation member against the operation member. contacting or separating material. The operation member includes one that moves linearly with respect to the housing and one that rotates within a predetermined angle range with respect to the housing.

Compressed air is an example of a gas. The gas may be any compressed gas, and the compressed gas may be either air or inert gas. Nitrogen gas and rare gas, for example, can be used as the inert gas. The compressed gas can be either air or an inert gas. Nitrogen gas and rare gas, for example, can be used as the inert gas. The first orientation E1 is an example of a first orientation, and the second orientation E2 is an example of a second orientation.

Each of the pressure accumulation chambers 21 and 110 is an example of a gas storage chamber. The gas storage chamber is a space that stores gas supplied from the outside of the housing. The piston upper chamber 32, 120 is an example of a first gas chamber. The piston lower chambers 35, 123 are an example of a second gas chamber. The first gas chamber and the second gas chamber are spaces through which gas can enter and exit. The sleeve 39, exhaust path 80 and passageway 38 are one example of an exhaust mechanism. Cylinder 109, exhaust path 201 and passage 126 are an example of an exhaust mechanism. Housings 11 and 101 are examples of housings. A housing is a casing or body having an interior space.

Sleeve 39, passages 37, 38, 40, valve 49, and control chamber 44 are one example of a return mechanism. Cylinder 109, passages 124, 125, storage chamber 200, valve 127, biasing member 130, control chamber 141 and control chamber 139 are an example of a return mechanism. Passages 37, 38, 40, 124, 125 and storage chamber 200 are examples of passages. Passages 37 and 125 are examples of first passages. Passages 40, 124 and storage chamber 200 are examples of second passages. Control rooms 44 and 141 are examples of first and second control rooms, respectively . The top dead center of the striking parts 13 and 103 is an example of the first position. The bottom dead center of the striking parts 13 and 103 is an example of the second position. Valves 49 and 127 are examples of check valves .

The exhaust paths 80 and 201 are examples of first exhaust paths. The exhaust paths 23 and 112 are examples of second exhaust paths. Cylinders 12 and 109 are examples of cylinders, respectively. The head valve 24 is an example of a valve body. Bumpers 33 and 128 are examples of bumpers. Valve seat 119 is an example of a valve seat. Nails 63 and 168 are examples of fasteners. The fastener may be shaft-shaped or arch-shaped. The cylinder 109 serves as a valve having a function of connecting and disconnecting a path for supplying and discharging gas to and from the piston upper chamber 120 and a function of connecting and disconnecting a path for supplying and discharging gas to and from the piston lower chamber 123. have

The fastening tool is not limited to the above embodiment, and can be modified in various ways without departing from the scope of the invention. The bumper may be made of synthetic rubber or a flexible container filled with gas. The operating member may be operable with an operating force, and the operating member includes a lever, trigger, arm, plunger, and the like. The passage, the first exhaust passage, and the second exhaust passage need only allow gas to pass therethrough, and the passage, the first exhaust passage, and the second exhaust passage include gaps, grooves, spaces, slits, and holes, respectively.

DESCRIPTION OF SYMBOLS 10, 100... Driver, 11, 101... Housing, 12, 109... Cylinder, 13, 103... Impact part, 14, 148... Trigger, 21, 110... Accumulator, 23, 80, 112, 201... Exhaust path , 24... Head valve 32, 120... Piston upper chamber 33, 128... Bumper 35, 123... Piston lower chamber 37, 38, 40, 124, 125, 126... Passage 39... Sleeve 44, 139, 141... Control chamber 49, 127... Valve 109... Cylinder 119... Valve seat 130... Biasing member 200... Storage chamber E1... First direction E2... Second direction

Claims (8)

An operation member for applying and releasing an operation force by a user, a striking part capable of striking a fastener in a first direction and a second direction opposite to the first direction, and actuating the striking part. a first gas chamber to which gas is supplied when an operating force is applied to the operating member, and to operate the striking portion in the first direction by the pressure of the gas; pressure of the gas; and a housing in which the cylinder is fixed and the second gas chamber is formed, wherein
an exhaust mechanism having an exhaust passage connecting the outside and the inside of the housing, and exhausting the gas in the second gas chamber to the outside of the housing in a stroke in which the striking portion operates in the first direction;
a passage connecting the first gas chamber and the second gas chamber; and a valve capable of opening and closing the passage, wherein the operating force applied to the operating member is applied after the striking portion operates in the first direction. a return mechanism that, when released, supplies gas from the first gas chamber to the second gas chamber, thereby causing the pressure of the second gas chamber to operate the striking portion in the second direction;
a sleeve movable within the housing relative to the cylinder between a standby position and an exhaust position ;
When an operating force is applied to the operating member, the sleeve moves to the exhaust position to connect the exhaust path and the second gas chamber, and when the operating force on the operating member is released, the sleeve moves to the exhaust position. A tool that moves to a standby position to allow the valve to open the passageway . a first control chamber into which gas is discharged when an operating force is applied to the operating member and gas is supplied when the operating force on the operating member is released;
2. The fastening tool according to claim 1, wherein said sleeve moves to said standby position based on pressure in said first control chamber to allow said valve to open said passage . the striking portion operates from a first position to a second position in the first orientation and from the second position to the first position in the second orientation;
3. The fastening tool according to claim 1, wherein said sleeve blocks said exhaust passage and said second gas chamber when said striking portion is stopped at said first position. a valve body operably provided within the housing and capable of contacting and separating from the cylinder;
a bumper provided in the housing and contacted by the striking portion that operates in the first orientation ;
The first gas chamber is formed between the valve body and the striking portion within the cylinder,
the second gas chamber is formed between the striking portion and the bumper within the cylinder;
4. The fastening tool according to claim 1, wherein gas is supplied to said first gas chamber when said valve body is actuated and said valve body is separated from said cylinder. a gas storage chamber provided inside the housing and supplied with gas from the outside of the housing;
a second exhaust path for discharging gas from the inside of the housing to the outside of the housing,
the gas in the gas storage chamber is supplied to the first gas chamber when an operation force is applied to the operation member;
5. The gas in the first gas chamber according to any one of claims 1 to 4, wherein the gas in the first gas chamber is discharged to the outside of the housing through the second exhaust path when the operating force applied to the operating member is released. hammer. The operating member is
a trigger to which a user manually applies and releases an operating force;
a contact element to which an operating force is applied when a user contacts a mating member into which the fastener is to be driven, and to which the operating force is released when the fastener is separated from the mating member;
When a user applies an operating force to the trigger and brings the contact element into contact with the mating member to apply an operating force to the contact element, gas is supplied to the first gas chamber,
When the user releases at least one of the operating force applied to the trigger and the operating force applied to the contact element, the gas in the first gas chamber is supplied to the second gas chamber. A tool according to any one of claims 1 to 5. The passage is
a first passage radially penetrating the cylinder and connected to the first gas chamber;
a second passage formed outside the cylinder and connecting the first passage and the second gas chamber;
The valve is provided on the outer circumference of the cylinder, allows the gas in the cylinder to pass through the first passage and is discharged to the second passage, and allows the gas in the second passage to pass through the first passage. A check valve that prevents entry into the cylinder through the passage ,
2. The fastening tool according to claim 1, wherein said first passage is closed by said check valve when an operating force is applied to said operating member. 8. The fastening tool of claim 7, wherein the sleeve holds the check valve closed to the first passage.

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