JPH0615976U - Pneumatic fixing tool driving machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fastener driving machine capable of accurately and easily driving a nail or the like even in an extremely narrow space. [Construction] In the nailing machine 1, a handle 3 and a housing 4 are formed separately, and the handle 3 is connected to the housing 4 so that the handle 3 can rotate around the axis of the handle.
3, the connecting member 33 is formed in a hollow (39) so that the pressurized air chamber 2 in the handle communicates with the pressurized air chamber 22 in the housing, and the trigger valve 14 is triggered. The handle 16 including the lever 16 can be rotated together with the handle. Then, the control air from the trigger valve 14 is supplied to the feed pipe 3 passing through the connecting member.
After that, it is fed to the control chamber 19 of the main valve 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pneumatic fixing tool driving machine such as a nail driving machine, and more particularly to a pneumatic fixing tool driving machine capable of performing nailing in a narrow portion such as a Japanese-style ceiling.

[0002]

[Prior art]

 Pneumatic fastener driving machines that use pressurized air to drive hitting members such as blades with a piston / cylinder device to drive fasteners such as nails into the object to be hammered in such as wood are extremely well suited. Are known. A typical structure of this pneumatic fastener driving machine is a housing having a handle in which a chamber for receiving pressurized air is formed, a main cylinder in the housing, and a reciprocating motion in the main cylinder. And a main piston connected to a driving member for striking a fixture at a lower nose, and a stationary position provided above the main cylinder to prevent supply of pressurized air to the main cylinder. The main valve moves from the upper part of the main cylinder to the firing position where pressurized air is supplied to the cylinder chamber above the main piston, and the main valve is placed in the rest position when not pushed, and the main valve is placed in the firing position when pushed. And a trigger device having a trigger valve for controlling the pressurized air to the main valve so as to be positioned at.

In the fastener driving machine having the above-mentioned configuration, the main valve in the stationary position is moved to the firing position by pushing the trigger valve of the trigger device to move the main piston to the lower nose side. It is moved abruptly, and then the trigger valve is returned to move the main valve in the firing position to the rest position to stop the supply of pressurized air to the cylinder chamber above the main piston, and at the same time the main cylinder and housing The compressed air is supplied from the return compressed air reservoir to the cylinder chamber below the main piston to return the main piston, and the air in the cylinder chamber above the main piston is exhausted to the outside of the housing during this return. Also, when returning, he sends the next fixture to the nose.

Since such a fastener driving machine is convenient and convenient, it is widely used in construction sites. By the way, at the construction site, in order to be able to drive fasteners such as nails into an object to be hammered in, such as wood, at the desired position and posture using these fastener driving machines, Need space for hands and bodies to hold. In the case of walls, etc., it is often possible to secure a sufficient space, but for example, a space on the ceiling or, in particular, a Japanese-style ceiling made by modern construction methods has a column with a rim for mounting the end of the ceiling plate. Is extremely narrow, and none of the fastener driving machines to date are small enough to drive in that space. In particular, the conventional fastener driving machine requires a certain length in the axial direction of the main cylinder, and the length in this direction cannot be shortened. Therefore, there was an inconvenience that the driving machine could not be used.

Therefore, a fastener driving machine has been proposed in which the length of the main cylinder in the axial direction is extremely shortened to shorten the length of the driving machine body. However, even in the fixing tool driving machine, in a very narrow place or in a place where the footing is bad and it is not possible to freely move around on a ladder or a platform, a trigger device provided on the handle part that is held by a person's hand When operating the, it was sometimes difficult to operate the trigger while holding the handle firmly.

Therefore, an object of the present invention is to provide a fastener driving machine capable of accurately and easily driving a nail or the like even in an extremely narrow space.

[0007]

[Means for Solving the Problems]

 According to the present invention, there is provided a pneumatic fastener driving machine, in which a handle and a housing are formed separately, and the handle is rotatable about an axis of the handle with respect to the housing. , The connecting member is formed hollow so that the pressurized air in the handle is supplied into the housing, and the trigger valve is installed in the handle and A pneumatic fastener driving machine is provided, which is characterized in that the control air is supplied to the main valve via a supply pipe passing through the connecting member.

Further, in the above fastener driving machine, a main valve is provided at a position between the main cylinder and the trigger valve so as to be movable substantially parallel to the main piston, and between the upper surface of the main valve and the upper surface of the main cylinder. An air communication passage is formed in the main valve, and the main valve is sealed to prevent the pressurized air in the housing from flowing into the air communication passage when in the stationary position, and the control air from the trigger valve is received. It consists of a large-diameter pressure receiving part placed in the chamber and a through hole that penetrates from the upper surface side to the lower surface side and sends air from the air communication passage to the exhaust hole of the housing. In some cases, the cylinder chamber above the main piston is communicated with the outside of the housing through the air communication passage and through hole, and when the main valve is in the firing position, the bottom surface of the main valve Is designed to abut the housing surface to seal the through hole, thereby further reducing the size of the fastener driving machine. Similarly, the main valve extends in a narrow gap between the upper end of the main cylinder and the inner surface of the housing and abuts against the housing surface, and extends from the seal portion to the outer circumference of the main cylinder to extend the outer circumference of the main cylinder. It consists of a slide part that slides in the axial direction and a large-diameter pressure receiving part that is formed in this slide part and that is located in the control chamber that receives the control air from the trigger valve. Through an exhaust passage through the housing to the exhaust hole, and by fixing the inlet of the exhaust passage at the upper end of the main cylinder at a position where the main valve can be sealed by the seal part when the main valve is in the firing position. The tool driver can be made compact.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a nailing machine 1 as a pneumatic fastener driving machine has a housing 4 provided with a handle 3 in which a pressurized air chamber 2 for receiving pressurized air is formed. At the bottom of the housing 4, there is integrally provided a nose 5 for driving a nail as a fixture. In addition, the nose 5 is provided with a nail feeding portion 6 as a fixture in parallel with the handle 3, and a magazine 7 for winding and accommodating a continuous body of nails into a coil is provided for each nose 5. Nails are being delivered.

In the housing 4 of the nailing machine 1, there is a main cylinder 8, a main piston 9 arranged to move back and forth in the main cylinder, and a lower nose 5 connected to the main piston 9 A driving member 10 for hitting the fixing tool is provided. Then, a main valve 12 is arranged at a position separated from the main cylinder 8 and substantially parallel to the main cylinder 8. The main valve 12 is provided between a stationary position that blocks the supply of pressurized air to the main cylinder 8 and a firing position that supplies pressurized air from the upper part of the main cylinder 8 to the cylinder chamber above the main piston 9. Move up and down in the figure. An air communication passage 13 is provided between the upper portion of the main valve 12 and the upper portion of the main cylinder 8. The main valve 12 is controlled by a trigger valve 14.

The trigger valve 14 positions the main valve 12 in the stationary position when the valve pin 15 is not pushed, and positions the main valve in the firing position when the valve pin 15 is pushed. In a normal state, that is, when the trigger lever 16 cannot push up the valve pin 15, the valve pin 15 is in the rest position in FIG. 1, and the pressurized air in the pressurized air chamber 2 passes through the valve cylinder 17 and the passage 18 to the main valve. Twelve control rooms 19 are sent. When the valve pin 15 is pushed up to the firing position, that is, the upper position, the supply of the pressurized air from the valve cylinder 17 to the passage 18 is stopped, and the air in the passage 18 passes through the valve cylinder 17 to the atmosphere from the hole 20 of the valve cover. Be escaped to.

The main valve 12 is controlled by the operation of the trigger valve 14. That is, when the trigger valve 14 is in the rest state (rest position state) in FIG. 1, the main valve 12 is in the rest position, and then the trigger lever 16 pushes the valve pin 15 to bring the trigger valve 14 into the rest position. The main valve 12 is moved to the firing position shown in FIG. 2, and the driving member 10 connected to the main piston 9 is suddenly moved to the lower nose side to drive the nail in the nose 5 into the driving target. . Then, by releasing the trigger lever 16, the valve pin 15 in the firing position is returned to the rest position in FIG.

The main valve 12 seals the compressed air from the compressed air chamber 22 in the housing 4 so that the compressed air does not flow into the air communication passage 13 when the main valve 12 is in the rest position in FIG. Therefore, the main valve 12 is provided with a sealing portion, that is, a sealing O-ring 23 on the upper surface side thereof. Further, the main valve 12 is provided with a pressure receiving portion 24 disposed in the control chamber 19 which receives the control air from the trigger valve 14 at an intermediate position thereof, and the area of this pressure receiving portion 24 is larger than the pressure receiving area on the upper surface of the main valve 12. When the pressurized air having the same pressure acts on the pressure receiving portion and the valve upper surface, the main valve 12 is pushed upward, that is, to the rest position in FIG. Then, as shown in FIG. 2, when the pressurized air in the control chamber 19 is exhausted, it is pushed down to the firing position by the pressurized air applied to the upper surface of the main valve. Further, the main valve 12 is formed with a through hole 25 penetrating from the upper surface side to the lower surface side. The through hole 25 is for exhausting the air in the main piston upper chamber of the main cylinder 8 to the exhaust hole 26 via the air communication passage 13.

A sealing material 27 is provided on the housing surface on the lower surface side of the main valve 12, and when the main valve 12 is in the firing position in FIG. 2, the lower surface of the main valve contacts the sealing material 27 on the housing surface. Through hole 25 is sealed. A spring 28 is provided in the control chamber 19 between the main valve 12 and the housing 4 so as to push up the main valve 12 by contacting one end with the pressure receiving portion 24. If it is not present, it is weak enough to push up the main valve 12 so that it does not rattle, and is not essential.

In the operation of the nail driving machine 1, after pushing the nose 5 against the driving target and pushing up the safety arm 30, the trigger lever 16 is moved from the rest position of FIG. 1 to the firing position as shown in FIG. When pulled, the supply of pressurized air from the trigger valve 14 to the control chamber 19 is stopped, and at the same time, the pressurized air in the control chamber 19 is exhausted from the trigger valve 14 through the hole 20 and the pressure receiving portion of the main valve 12 is exhausted. There is no push-up action on the 24 by the pressurized air. On the other hand, since pressurized air is still being applied to the upper surface of the main valve 12, the main valve 12 is lowered downward, the sealing O-ring 23 is separated from the valve seat surface of the housing 4, and the seal is released. The lower surface of the main valve 12 is in close contact with the sealing material 27 to seal the through hole 25 and prevent pressurized air from coming out from the exhaust hole 26. As a result, pressurized air is supplied to the air communication passage 13 from the pressurized air chamber 22, and the pressure of the pressurized air acts on the upper surface of the main piston 9 to rapidly push down the main piston 9 and the driving member 10. , Drive the nail on the nose 5 into the object. At this time, the air in the cylinder chamber below the main piston 9 and the pressurized air in the cylinder chamber above the main piston are stored in the return pressurized air reservoir 31.

When the nose 5 is separated from the object to be driven and the trigger lever 16 is returned, the stationary state shown in FIG. 1 is restored. That is, when pressurized air is supplied from the valve cylinder 17 to the control chamber 19, the main valve pushing force applied to the pressure receiving portion 24 becomes larger than the main valve pushing force acting on the upper surface side of the main valve 12. Then, the main valve 12 is pushed up, and the O-ring 23 comes into close contact with the valve seat surface of the housing 4 to shut off the supply of pressurized air to the main cylinder 8. At the same time, the bottom surface of the main valve is separated from the seal material 27 to communicate the through hole 25 with the exhaust hole 26, whereby the air in the cylinder chamber on the upper side of the main piston 9 passes through the air communication passage 13 and the through hole 25. The air is exhausted to the outside of the housing and returns to the stationary state shown in FIG.

In the nailing machine 1 having such a configuration, as shown in the drawing, the length of the main cylinder in the axial direction can be extremely shortened to shorten the length of the nailing machine main body. However, even with this nail driver, when operating the trigger lever provided on the handle part that is gripped by a person's hand depending on the direction in which the nail is driven, the handle can be operated properly in a very narrow space or in a place with poor footing. It was sometimes difficult to operate the trigger while holding it.

Therefore, in the present invention, the handle 3 and the housing 4 are formed separately, and the handle 3 and the housing 4 are connected by the connecting member 33. The connecting member 33 connects the handle 3 to the housing 4 so as to be rotatable about the axis of the handle 3. Therefore, in the illustrated example, one end of the connecting member 33 is fixed to the housing 4, while the handle 3 is connected to the flange 35 of the connecting member 33 by the nut 34 so that the handle 3 rotates about its axis. I am able to rotate to. Further, the connecting member 33 is formed hollow so that the pressurized air in the pressurized air chamber 2 of the handle 3 is supplied to the pressurized air chamber 22 of the housing 4, and the pressurized air is exposed to the outside. An O-ring 36 is provided on the handle 3 side and an O-ring 37 is provided on the housing 4 side so as not to leak.

The trigger valve 14 is provided not on the housing 4 but on the handle 3. As the handle 3 rotates, the trigger valve 14 can be rotated around the axis of the handle and the position of the trigger lever 16 can be changed. it can. Further, the control air sent from the trigger valve 14 to the main valve 12 passes through a feed pipe 38 communicating with the passage 18. That is, the feeding pipe 38 penetrates the hollow portion 39 of the connecting member 33 from the handle 3 and is connected to the passage 18 to the main valve 12. The feed pipe 38 is provided along the axis that is the center of rotation of the handle 3 and smoothes the rotation of the handle 3. Further, an O-ring 40 is provided on the handle 3 side and an O-ring 41 is provided on the housing 4 side so that the control air passing through the feed pipe 38 does not leak outside. Further, a gap is formed between the flange 35 of the connecting member 33 and the flange locking portion of the nut 34, and a cushion member 42 is provided. Therefore, when pressurized air is not supplied to the pressurized air chamber 2 of the handle 3, the handle 3 can easily rotate with respect to the housing 4. Then, when the pressurized air is supplied to the chamber 2, the pressure of the pressurized air acts on the end surface of the connecting member 33, and the connecting member is pushed by the small-diameter housing side and press-contacts the cushion member 42, so that the three members are pressed. The frictional engagement of 33, 34 and 42 prevents free rotation of the handle 3.

FIG. 3 shows a nailing machine 44 according to a second embodiment of the present invention. In this nailing machine 44, a main valve 45 is concentrically arranged on the upper outer circumference of a main cylinder 46, and a piston of the main cylinder 46 is passed through an exhaust passage 47 formed from an upper end of the main cylinder 46 toward a lower side surface. It is basically the same as the nailing machine 1 of the first embodiment except that it is exhausted from the upper chamber.

The main valve 45 extends in a narrow gap between the upper end of the main cylinder 46 and the inner surface of the housing 48 and abuts against the housing surface. The seal portion 49 extends from the seal portion 49 to the outer circumference of the main cylinder 46. A slide portion 50 that slides the outer periphery of the main cylinder in the axial direction thereof, and a large-diameter pressure receiving portion 51 formed on the lower side of the slide portion 50. The pressure receiving portion 51 is arranged in a control chamber 53 that communicates with a passage 52 so as to receive the pressurized air controlled by the trigger valve 14. The diameter of the pressure receiving portion 51 is formed larger than the diameter of the sealing portion 49. Therefore, in a stationary state in which pressurized air is supplied to the control chamber 53 from the trigger valve 14 and pressurized air in the housing is also applied to the seal portion 49, it is strongly pushed up and maintained in the state of FIG.

In the main cylinder 46, an exhaust passage 47 for exhausting the cylinder chamber above the piston when the main piston 55 is returned is formed from the upper end portion toward the lower side surface. The exhaust passage 47 is located on the side surface of the housing 48. To the exhaust hole 56 formed in. The upper end (inlet) of the exhaust passage 47 is sealed by the seal portion 49 of the main valve 45.

When the nailing machine 44 is in the stationary state shown in FIG. 3, the pressurized air supplied to the pressurized air chamber 2 of the handle 3 reaches the passage 52 through the trigger valve 14 and is controlled from the passage 52. It is supplied to the control chamber 53 and acts to push up the pressure receiving portion 51 of the main valve 45, so that the main valve 45 is in close contact with the housing 48 and supplies pressurized air from the pressurized air chamber 57 of the housing 48 to the main cylinder 46. Stop doing. Therefore, the main piston 55 and the driving member 10 are maintained in the state of FIG.

Next, when the lower end of the nose 5 is pressed against the driven object to push up the safety arm and the trigger lever 16 is pulled, the air in the control chamber 53 passes from the passage 52 through the trigger valve 14 to the atmosphere from the hole 20 to the atmosphere. Exhausted. As a result, the main valve 45 is lowered downward, the seal portion 49 is separated from the housing 48, and pressurized air is rapidly supplied to the upper portion of the main cylinder 46, and the main piston 55 and the driving member 10 are rapidly pushed down. , Drive the nail on the nose 5 into the object. At the time of this driving, the air in the cylinder chamber below the main piston 55 and the pressurized air supplied to the cylinder chamber above the main piston 55 are sent to the return pressurized air reservoir 58. Next, when the trigger lever 16 is released, the pressurized air is supplied to the control chamber 53 through the trigger valve 14 and pushes up the main valve 45, and the seal portion 49 is brought into close contact with the housing 48 to the main cylinder 46. Shut off the supply of pressurized air. At the same time, the seal portion 49 of the main valve 45 opens the inlet of the exhaust passage 47 and exhausts the air above the piston of the main piston 46 through the exhaust passage 47.

Also in this embodiment, the handle 3 and the housing 48 are formed separately, and the handle 3 and the housing 48 are connected by the connecting member 33, and the connecting member 33 connects the handle 3 with respect to the housing 48. One end is fixed to the housing 48 and the other end is rotatably connected to the handle 3 by a nut 34 so as to be rotatable around. Further, the handle 3 is provided with the trigger valve 14, and the hollow portion 39 of the connecting member 33 is provided with the feed pipe 38 for sending the control air from the trigger valve 14 to the passage 52. Therefore, the handle 3 can be rotated together with the trigger valve 14 including the trigger lever 16, and the trigger operation can be facilitated while firmly holding the handle even in a very narrow place or a place where the scaffolding is poor.

In the present invention, as long as the handle is provided with a trigger valve and the handle can be rotated about the axis with respect to the housing, the nailing machine 1 of the first embodiment and the second embodiment Needless to say, it can be applied to conventional fastener driving machines other than the nail driving machine 44 of FIG.

[0027]

[Effect of device]

 According to the present invention, the handle is connected to the housing via the connecting member so that the handle can rotate about the shaft axis of the handle, and the connecting member supplies the pressurized air in the handle into the housing. , It is hollow, the trigger valve is installed in the handle, and the control air from the trigger valve is fed to the main valve via the feed pipe passing through the connecting member, so it is very Even in a narrow space, the trigger can be easily operated while holding the handle firmly. In particular, if there is a gap into which the housing can be inserted, the handle can be set at an arbitrary angle, so that it is possible to take a posture that is easy to drive even in a narrow place or a place where the scaffolding is poor, and it is possible to secure an accurate and comfortable driving motion.

Further, the main valve is provided between the main cylinder and the trigger valve so as to be movable substantially parallel to the main piston, and an air communication passage is formed between the upper surface of the main valve and the upper surface of the main cylinder. Is a top-side sealing part that seals the housing so that pressurized air in the housing does not flow into the air communication path when in the stationary position, and a large-diameter pressure receiving part that is located in the control chamber that receives the control air from the trigger valve. , A through hole that penetrates from the upper surface side to the lower surface side and sends air from the air communication passage to the exhaust hole of the housing.When the main valve is in the rest position, the air in the cylinder chamber above the main piston is Through the air communication passage and through hole to the outside of the housing, and when the main valve is in the firing position, the bottom surface of the main valve contacts the housing surface. The fastener driving machine can be further downsized by constructing the through hole to seal the through hole. Similarly, the main valve extends into the narrow gap between the upper end of the main cylinder and the inner surface of the housing and abuts against the housing surface, and extends from the seal portion to the outer circumference of the main cylinder. It consists of a slide part that slides the outer circumference in the axial direction, and a large diameter pressure receiving part that is formed in this slide part and is located in the control chamber that receives the control air from the trigger valve. An exhaust passage through the lower side surface to the exhaust hole of the housing, and the inlet of the exhaust passage at the upper end of the main cylinder is provided at a position where the main valve can be sealed by the seal part when the main valve is in the firing position. According to this, the fastener driving machine can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional front view of a nail driving machine as a fixture driving machine of a first embodiment according to the present invention in a stationary position.

FIG. 2 is a partial sectional front view of the nailing machine of FIG. 1 at a driving position.

FIG. 3 is a partial sectional front view of a nail driving machine as a fixture driving machine of a second embodiment according to the present invention in a stationary position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nail driver as a fastener driving tool of the first embodiment 2 Pressurized air chamber of handle 3 Handle 4 Housing 5 Nose 8 Main cylinder 9 Main piston 12 Main valve 14 Trigger valve 16 Trigger lever 19 Control chamber 22 Housing Pressurized air chamber 23 O-ring as a sealing portion 24 Pressure receiving portion 25 Through hole 26 Exhaust hole 33 Connecting member 34 Nut 35 Flange 36, 37 O-ring 38 Feed pipe 40, 41 O-ring 42 Cushioning material 44 of the second embodiment Nailer as a fastener driving machine 45 Main valve 46 Main cylinder 47 Exhaust passage 48 Housing 49 Seal part 50 Sliding part 51 Pressure receiving part 53 Control chamber 55 Main piston 56 Exhaust hole

Claims (3)

[Scope of utility model registration request] 1. A housing having a handle in which a chamber for receiving pressurized air is formed, a main cylinder in the housing, a fixture arranged to reciprocate in the main cylinder, and a fixture at a lower nose. Of the main piston to which the driving member that strikes is connected, a stationary position that blocks the supply of pressurized air to the main cylinder, and a firing position that supplies pressurized air from the upper part of the main cylinder to the cylinder chamber above the main piston. Between the main valve that moves between the main valve and the main valve when not pressed,
In a pneumatic fastener driving machine comprising a trigger valve for controlling the main valve so as to position the main valve in the firing position when pushed, the handle and the housing are formed separately.
The handle is connected to the housing via a connecting member such that the handle can rotate about an axis of the handle, and the connecting member supplies pressurized air in the handle into the housing. The trigger valve is provided in the handle, and the control air from the trigger valve is fed to the main valve via a feed pipe passing through the connecting member. Pneumatic fixing tool driving machine characterized by. 2. The main valve is provided at a position between the main cylinder and the trigger valve so as to be movable substantially parallel to the main piston, and an air gap is provided between an upper surface of the main valve and an upper surface of the main cylinder. A communication passage is formed, and the main valve has a sealing portion on an upper surface side that seals the communication passage so that pressurized air in the housing does not flow into the communication passage, and a control chamber that receives control air from the trigger valve. A large-diameter pressure-receiving part arranged in
When the main valve is in the rest position, the cylinder chamber above the main piston is formed with the air from the upper surface side to the lower surface side and sends the air from the air communication passage to the exhaust hole of the housing. The through hole communicates with the outside of the housing through the communication passage and the through hole, and when the main valve is in the firing position, the lower surface of the main valve is in contact with the housing surface to seal the through hole. The fastener driving machine according to item 1. 3. The main valve extends into a narrow gap between an upper end of the main cylinder and an inner surface of the housing, and a seal portion abuts on the housing surface, and extends from the seal portion to an outer circumference of the main cylinder. It consists of a slide part that slides around the outer circumference of the main cylinder in its axial direction, and a large-diameter pressure receiving part that is formed in this slide part and that is arranged in a control chamber that receives the control air from the trigger valve. An exhaust passage is formed through the lower side surface to the exhaust hole of the housing, and the inlet of the exhaust passage at the upper end of the main cylinder is provided by the seal portion of the main valve when the main valve is in the firing position. The fastener driving machine according to claim 1, wherein the fastener driving tool is provided at a position where it can be sealed.