JP5788310B2 - Air driving tool - Google Patents

Description

  The present invention relates to an air driving tool for driving a driving tool using compressed air as a drive source.

As an air driving tool for driving a driving tool using compressed air as a driving source, an air driving machine for driving a driving tool such as a nail is known. This type of air driving tool is configured to reciprocate an internal piston by filling compressed air serving as a drive source or releasing the air. The piston is provided with a driver for driving a driving tool such as a nail toward the driving target, and the reciprocating motion drives the driving tool toward the driving target. Specifically, the air driving tool includes a tool main body that houses a piston, a driving unit that drives a driving tool by the operation of the piston, and a handle unit that includes an operation lever and can be gripped. In the air driving tool configured as described above, by operating the operating lever, compressed air is sent to the piston upper chamber of the tool body to expand the piston upper chamber, thereby moving the piston downward. By the downward movement of the piston, the driver pushes the driving tool in the driving direction, and drives the driving tool toward the driving target. In the above-described air driving tool, after driving the driving tool, compressed air (return air) is sent to the piston lower chamber of the tool body in response to the release of the pulling operation of the operation lever, and the piston upper chamber To the atmosphere. Then, the above-described piston is returned to the upper end position, and a series of driving operations as this type of air driving tool is completed.
On the other hand, when releasing the compressed air in the upper chamber of the piston to the atmosphere, it is known that the exhaust from the inside of the tool body to the outside of the tool body is set to blow out from the side surface of the tool body that intersects the driving direction. (For example, refer to Patent Document 1). If the vent hole to be exhausted is set on the side of the tool body, the length of the air driving tool can be shortened, reducing the bulk as an air driving tool, The ease of use can be improved.

Patent No. 3099285

On the other hand, in the air driving tool described above, in order to further improve the ease of use as an air driving tool, it is desired to further shorten the machine length in the driving direction.
The present invention has been made in view of such circumstances, and the problem to be solved by the present invention is to provide an air driving tool for driving a driving tool using compressed air as a driving source, and to reduce the length in the driving direction. By shortening it as much as possible, the bulk as an air driving tool is reduced as much as possible to further improve the ease of use as a tool.

In solving the above-described problems, the air driving tool according to the present invention takes the following means.
That is, the air driving tool according to the first aspect of the present invention is an air driving tool for driving a driving tool using compressed air as a driving source, and the driving tool is driven into a tool body that generates driving force. A driver for driving and driving the driver, and a main valve for opening and closing the compressed air inflow in the piston upper chamber for driving the piston. The valve is opened so as to send the compressed air to the piston upper chamber by movement along the driving direction, and on the side side surface along the driving direction of the driving tool among the side surfaces of the main body housing of the tool body. Is provided with an exhaust port structure for exhausting unnecessary air existing inside the tool body after driving out to the outside of the tool body. And features.

  According to the air driving tool according to the first invention, the main valve is configured to open the valve so as to send compressed air to the piston upper chamber by movement along the driving direction of the driving tool. Providing a valve urging member for closing at a site opposite to the driving direction of the driving tool can be eliminated. As a result, the length of the air driving tool in the driving direction can be shortened. Furthermore, according to the air driving tool according to the first aspect of the present invention, unnecessary air that exists in the tool body after driving is applied to the side surface along the driving direction of the driving tool among the side surfaces of the main body housing of the tool body. An exhaust port structure for exhausting to the outside of the main body is provided. Accordingly, it is possible to eliminate the arrangement of the exhaust port structure along the machine length direction in the driving direction, and it is possible to shorten the machine length in the driving direction. Therefore, according to the air driving tool according to the first invention, the bulk as the air driving tool can be reduced as much as possible, and the ease of use as the tool can be further improved.

An air driving tool according to a second aspect of the invention is the air driving tool according to the first aspect of the invention, wherein the exhaust port structure is disposed on the outer periphery of the main body housing and is an external outlet for exhausting the unnecessary air. The cover body is attached to the outer periphery of the main body housing with a part of a protector that has elasticity and forms an exterior of the main body housing. .
According to the air driving tool of the second invention, the cover body is attached to the outer periphery of the main body housing with a part of the protector forming the exterior of the main body housing interposed between the cover body and the protector. Thus, the assembled state between the main body housing and the cover body can be enhanced.

An air driving tool according to a third invention is the air driving tool according to the second invention, wherein the protector is a molded member made of an elastic material, and the cover body is partially interposed between the body housing and the air driving tool. Adhesiveness with the main body housing is ensured by elastic deformation of the protector to be mounted.
According to the air driving tool according to the third aspect of the invention, the protector is a molded member made of an elastic material, and the cover body is formed between the body housing and the body housing by elastic deformation of the protector partially interposed between the body housing and the body. Since the adhesion is ensured, it is possible to further ensure the stability of the exhaust function while enhancing the assembled state of the main body housing and the cover body.

An air driving tool according to a fourth aspect of the present invention is the air driving tool according to the second or third aspect of the present invention, wherein the protector has a shape protruding further outward than the outer peripheral surface of the cover body. It is characterized by being.
According to the air driving tool according to the fourth aspect of the invention, the protector is formed to have a shape projecting further outward than the outer peripheral surface of the cover body. For example, the air driving tool is dropped on the ground. Even in the case of hitting, the cover body can be protected from being damaged by the shape protruding to the outside of the protector.

An air driving tool according to a fifth invention is the air driving tool according to any one of the second to fourth inventions, wherein the cover body is partially interposed between the body housing and the air driving tool. A through hole for exposing the protector to the outside is provided, and the protector interposed between the main body housing and the cover body protrudes further outward than the outer peripheral surface of the cover body through the through hole. It is formed.
According to the air driving tool according to the fifth aspect of the invention, the protector interposed between the main body housing and the cover body is formed to protrude further outward than the outer peripheral surface of the cover body through the through hole. The protector protruding outward can be disposed close to the cover body. This protects the cover body from being damaged more effectively by the shape of the protector placed close to the cover body even when it is applied to the ground, for example by dropping an air driving tool. can do.

An air driving tool according to a sixth invention is the air driving tool according to any one of the second to fifth inventions, wherein a plurality of the external outlets are arranged in a direction intersecting a driving direction of the driving tool. It is provided.
According to the air driving tool according to the sixth aspect of the present invention, the plurality of external outlets are arranged side by side in a direction intersecting the driving direction of the driving tool, so that an area facing the outside for exhausting can be efficiently provided. Can be formed.

An air driving tool according to a seventh invention is the air driving tool according to any one of the second to sixth inventions, wherein a plurality of the external outlets are arranged along the driving direction of the driving tool. The blowing direction from the external blowing port for exhausting the unnecessary air is set to be inclined in a direction along the driving direction of the driving tool.
According to the air driving tool according to the seventh aspect of the present invention, since a plurality of external outlets are provided along the driving direction of the driving tool, an area facing the outside for exhausting is more efficiently formed. can do. Further, since the blowing direction from the external outlet for exhausting this unnecessary air is set to be inclined in the direction along the driving direction of the driving tool, the blowing direction can be directed to the driving target. And can improve comfort during use.

An air driving tool according to an eighth invention is the air driving tool according to any one of the first to seventh inventions, wherein return air for returning the piston to an initial position after driving the piston is applied to the piston. It is characterized in that it is set so as to reuse the compressed air that has flowed into the piston upper chamber in order to drive it.
According to the air driving tool according to the eighth aspect of the present invention, the return air that returns the piston to the initial position after driving the piston is reused by the compressed air that has flowed into the piston upper chamber to drive the piston. Therefore, the compressed air for driving in can be used efficiently.

According to the air driving tool according to the first invention, the bulk as the air driving tool can be reduced as much as possible, and the usability as a tool can be further improved.
According to the air driving tool according to the second aspect of the invention, the assembled state between the main body housing and the cover body can be increased.
According to the air driving tool according to the third aspect of the present invention, it is possible to improve the stability of the exhaust function while enhancing the assembled state of the main body housing and the cover body.
According to the air driving tool according to the fourth aspect of the present invention, the cover body can be protected from being damaged by the shape protruding to the outside of the protector.
According to the air driving tool according to the fifth aspect of the invention, the shape of the protector disposed close to the cover body can protect the cover body more effectively so as not to be damaged.
According to the air driving tool according to the sixth aspect of the present invention, it is possible to efficiently form a region facing the outside for exhaust.
According to the air driving tool according to the seventh aspect of the present invention, the area facing the outside for exhausting can be more efficiently formed, and this blowing direction can be directed to the driving object and in use. Can enhance the comfort.
With the air driving tool according to the eighth aspect of the invention, it is possible to efficiently use compressed air for driving operation.

It is the whole tool external view which shows the whole external appearance of an air driving tool in a perspective view. It is the whole tool external view which shows the whole external appearance of an air driving tool in another perspective view. It is the whole tool sectional view showing the internal structure of an air driving tool in a half section. It is internal structure sectional drawing of the tool main body which shows a driving | operation 1st operation state. It is internal structure sectional drawing of the tool main body which shows a driving | operation 2nd operation state. It is internal structure sectional drawing of the tool main body which shows a driving | operation 3rd operation state. It is internal structure sectional drawing of the tool main body which shows a driving | operation 4th operation state. It is a partially cutaway sectional view showing the exhaust port structure so that it can be seen. FIG. 9 is an enlarged cross-sectional view showing the exhaust port structure shown in FIG. 8 in an enlarged manner.

Hereinafter, an embodiment for carrying out an air driving tool according to the present invention will be described with reference to the drawings.
1 and 2 show an air driving tool 10 that uses compressed air as a drive source. The air driving tool 10 is a driving tool configured as an air nail driving a nail (not shown) as a driving tool. FIG. 1 is an overall tool external view showing the overall appearance of the air driving tool 10 in perspective. FIG. 2 is an overall tool external view showing the overall external appearance of the air driving tool 10 at a perspective angle different from that in FIG. FIG. 3 is an overall tool sectional view showing the internal structure of the air driving tool 10 in a half-section. 4 to 7 are cross-sectional views showing the internal structure of the tool body 15 with respect to the driving operation state of the air driving tool 10. 4 is a cross-sectional view of the internal structure of the tool body showing the first driving state, FIG. 5 is a cross-sectional view of the internal structure of the tool body showing the second driving state, and FIG. 6 is a tool body showing the third driving state. FIG. 7 is a sectional view of the internal structure of the tool body showing the fourth operating state.
Here, in describing the air driving tool 10, the side of the air driving tool 10 along the driving direction of a nail (not shown) is referred to as a “driving direction tip side”, and the nail driving direction of the air driving tool 10. The opposite side is referred to as the “driving direction proximal end side”. Since the air driving tool 10 generally drives a nail as a driving tool in a vertically downward direction, the air driving tool 10 may be referred to as a vertical direction in view of the generally used driving method. Incidentally, these directions are as shown in each figure. 1 and 2 is a driving material corresponding to the driving object according to the present invention.

The air driving tool 10 shown in FIGS. 1 and 2 generally includes a tool main body 15, a driving unit 60, a handle unit 70, and a magazine 75. First, before describing the tool main body 15, the driving unit 60, the handle unit 70, and the magazine 75 disposed on the tool main body 15 will be described.
The driving portion 60 extends on the distal end side of the tool main body 15 in the same manner as the extension structure of the tool main body 15. The driving portion 60 is a portion to which a nail loaded in the magazine 75 is sent when a nail (not shown) is driven into the driving material W. Here, the nail sent to the driving unit 60 is driven by the driver 35 provided in the tool body 15. Therefore, the driving unit 60 has a function of guiding the driving movement of the driver 35 when driving the nail into the driving material W, and also has a function of guiding the firing trajectory of the driving nail. Specifically, an insertion path 65 for inserting a driver 35 described later is provided. A nail that can be driven by the driver 35 is sent from the magazine 75 to the insertion path 65. The driving portion 60 is provided with a contact top 62. The contact top 62 has a function of detecting whether or not the tip of the driving portion 60 into which the nail is driven is pressed against the driving material W. Only when the contact top 62 is crimped to the driving material W, the trigger valve can be turned on by pulling the operation trigger 732 described later.

The handle portion 70 extends at a side portion (rear portion) of the tool body 15 in a direction intersecting with the extending structure of the tool body 15. The handle portion 70 is formed in a hollow shape that allows a user to supply compressed air while being formed in an outer shape that can be gripped by a user with one hand. Thus, the pressure accumulation chamber 71 in which compressed air is stored is provided inside the hollow handle portion 70. The pressure accumulating chamber 71 is supplied with compressed air from a hose joint portion 72 provided at the rear end portion of the handle portion 70 and stored therein. In addition, the hose joint part 72 provided in the rear end part of the handle part 70 is configured to be able to connect an air hose (not shown) for supplying compressed air. A trigger valve 73 is provided at the base portion of the tool body 15 in the handle portion 70. The trigger valve 73 includes a trigger valve main body 731 having a valve structure, and an operation trigger 732 for inputting an operation to the trigger valve main body 731. The trigger valve body 731 is turned on when the operation trigger 732 is pulled, and is turned off when the operation trigger 732 is released. As will be described in detail later, when the trigger valve is turned on, the compressed air stored in the valve urging chamber 56 is released to the atmosphere while the supply of the compressed air toward the tool body 15 is shut off. Further, when the trigger valve is turned off, the compressed air is sent and stored in the valve urging chamber 56 while the supply of the compressed air toward the tool body 15 is resumed.
The magazine 75 is configured to send a nail (not shown) to the driving portion 60 described above for each driving. The magazine 75 can be loaded with a plurality of nails in a wound form. Reference numeral 76 denotes a connecting portion that connects the handle portion 70 and the magazine 75. Reference numeral 77 is a hook for hooking the air driving tool 10.

Next, the tool body 15 will be described with reference to a sectional view of the entire air driving tool 10 of FIG. 3 and sectional views of the tool body 15 of FIGS. 4 to 7.
The tool main body 15 is configured by housing various members in a housing structure 20 formed by the main body housing 21 and the top cap 25, and functions to generate driving driving force. The main body housing 21 is formed in a substantially cylindrical shape. That is, the driving portion 60 described above is disposed on the distal end side of the main body housing 21.
The main body housing 21 includes a cylinder structure (cylinder 31) that generates a driving force for driving. A top cap 25 is attached to the driving proximal end side opening 23 of the main body housing 21. As will be described in detail later, the main body housing 21 is formed in a substantially cylindrical shape, and the top cap 25 is formed in a substantially bowl shape, and the opening proximal end side opening 23 of the main body housing 21 has this opening. A top cap 25 is attached so as to close the shape. Thus, the main body housing 21 and the top cap 25 form a housing structure 20.
In addition, a protector 90 is attached to the outer periphery of the main body housing 21. The protector 90 is made of an elastic elastomer (soft elastic material). The protector 90 is formed with an appearance design portion 91 so as to enhance the appearance design of the air driving tool 10. Further, the protector 90 has a function of improving the appearance design of the air driving tool 10 as described above, and also has a function of buffering an impact received by the air driving tool 10 when the air driving tool 10 is dropped. . Therefore, the protector 90 is formed of an elastically deformable elastomer while forming the exterior of the main body housing 21 so as to have a function of buffering the impact received by the air driving tool 10 in view of the appearance design of the air driving tool 10. It is formed by doing.

The housing structure 20 generally includes a piston structure 30 that allows the driver 35 to be inserted into the driving portion 60 described above, and a valve structure 40 for operating the piston structure 30.
The piston structure 30 generally includes a cylinder 31, a piston 33, a driver 35, and a damper member 37. The cylinder 31 is formed in a substantially cylindrical shape and is supported by the main body housing 21 described above. The cylinder 31 is provided with a base end side communication hole 311 at the base end portion, a front end side communication hole 312 at the front end portion, and an intermediate portion communication hole 313 at the intermediate portion so that air can flow into and out of the cylinder 31. It has been. The piston 33 is installed in the cylinder 31 so as to be able to reciprocate. The piston 33 is supported by the cylinder 31 so as to reciprocate due to a pressure change in the pressure chamber 50 described later. A driver 35 integrated with the piston 33 so as to extend along the moving direction of the piston 33 is provided on the tip side (lower side) of the piston 33. The driver 35 is adapted to enter the insertion passage 65 of the driving portion 60 as the piston 33 moves toward the tip side. At this time, a nail (not shown) disposed in the insertion passage 65 of the driving unit 60 is driven by the movement of the driver 35 toward the tip side. That is, the driver 35 is driven and operated by the reciprocating motion of the piston 33.

The damper member 37 has a function of buffering the movement impact of the piston 33 and determining the movement range limit end position of the piston 33. Specifically, the damper member 37 includes a top dead center damper 371 that determines the top dead center position on the upper side of the piston 33, and a bottom dead center damper 372 that determines the bottom dead center position on the lower side of the piston 33. The top dead center damper 371 determines the position of the most proximal end of the piston 33 and also functions to buffer an impact when the proximal end side movement of the piston 33 is stopped. The bottom dead center damper 372 determines the position of the foremost side of the piston 33, and also functions to buffer an impact when the tip 33 side movement of the piston 33 is stopped.
The valve structure 40 is generally configured to include a head valve 41, a partition wall 47, and a check valve 49. The valve structure 40 is partitioned by the head valve 41, the partition wall 47, the check valve 49, the housing structure 20, and the piston structure 30, thereby forming a plurality of pressure chambers 50. The plurality of pressure chambers 50 thus partitioned are switched to a non-communication state separated so that the inflow and outflow of air cannot be performed, or a communication state communicated so that the inflow and outflow of air can be performed. The function as the structure 40 is exhibited.
The head valve 41 corresponds to a main valve according to the present invention. This head valve 41 opens and closes the flow of compressed air into the piston upper chamber 52 in order to drive the piston 33 into operation. The head valve 41, which will be described in detail later, is configured to open the valve by movement along a driving direction of a nail (not shown), and sends compressed air to the piston upper chamber 52.

Specifically, the head valve 41 includes a valve main body 42, a seat portion 43, and an urging spring 44. The valve main body 42, the seat portion 43, and the biasing spring 44 are supported by the main body housing 21.
The valve body 42 is generally configured by an annular structure including a first contact portion 421, a second contact portion 422, and a communication hole 423. The valve main body 42 is disposed so as to be movable in the vertical direction, and O-rings 57 for separating the pressure chambers 50 are attached to appropriate positions on the inner peripheral surface and the outer peripheral surface. The first abutting portion 421 is formed on the end surface on the proximal end (upper end) side of the valve body 42 that can abut against the seat portion 43. That is, when the first contact portion 421 is in contact with the seat portion 43, the head valve 41 is in the valve closed state. On the other hand, when the first contact portion 421 is separated from the seat portion 43, the head valve 41 is in the valve open state. The second contact portion 422 is formed as a slidable contact portion that can contact the outer peripheral slidable contact surface 471 of the partition wall 47. For this reason, the second abutting portion 422 can be slidably brought into contact with the outer peripheral sliding contact surface 471 of the partition wall 47 according to the vertical movement of the valve body 42 by the attached O-ring 57 while projecting toward the partition wall 47. Yes. The communication hole 423 is formed in a shape penetrating through the inside and outside of the valve body 42. The air on the inner peripheral side of the valve main body 42 can be exhausted to the outer peripheral side of the valve main body 42 through the communication hole 423.

The seat portion 43 is fixedly supported on the top cap 25 of the housing structure 20 at a position adjacent to the base end (upper end) side of the valve body 42. As described above, the seat portion 43 is a portion with which the first abutting portion 421 of the valve body 42 abuts. Therefore, a surface of the seat portion 43 that faces the first contact portion 421 of the valve body 42 is formed in a surface shape on which the first contact portion 421 can contact. Accordingly, when the first contact portion 421 is separated from the seat portion 43 by the movement of the head valve 41 in the nail driving direction (not shown) and the forward direction, the head valve 41 is in the valve open state. Further, when the head valve 41 comes into contact with the seat 43 by the movement of the head valve 41 in the direction opposite to the nail driving direction (not shown), the head valve 41 is closed.
The biasing spring 44 is a spring that biases the valve body 42 toward the base end (upper end) side. Specifically, the urging spring 44 is formed of a coil spring and has one end abutted on the partition wall 47 and the other end abutted on the valve body 42. In this way, the urging spring 44 urges the valve main body 42 toward the base end (upper end) side together with the urging force generated by the internal pressure of the valve urging chamber 56. Here, when the internal pressure of the valve urging chamber 56 is a predetermined pressure or higher, the first contact portion 421 of the valve main body 42 is in contact with the seat portion 43, and the head valve 41 is in the valve Closed. When the internal pressure of the valve urging chamber 56 is not higher than a predetermined pressure, the first contact portion 421 of the valve main body 42 is separated from the seat portion 43, and the head valve 41 is opened. It becomes a state.
The partition wall 47 is disposed so as to be supported by the cylinder 31. As described above, the partition wall 47 is formed with the outer peripheral sliding contact surface 471 that can contact the second contact portion 422 of the valve body 42. For this reason, the outer peripheral sliding contact surface 471 of the partition wall 47 is formed to have a surface shape capable of slidingly contacting the second contact portion 422 of the valve main body 42 as the valve main body 42 moves up and down. The partition wall 47 is provided with a communication hole 472 that allows the inside and outside of the partition wall 47 to communicate with each other. A check valve 49 is disposed outside the communication hole 472. That is, when the pressure in the cylinder 31 is higher than the pressure outside the cylinder 31, the check valve 49 functions so that the inside and outside of the partition wall 47 communicate with each other through the communication hole 472. On the other hand, when the pressure outside the cylinder 31 is higher than the pressure inside the cylinder 31, the check valve 49 functions and functions to block communication through the communication hole 472.

The head valve 41, the partition wall 47, the check valve 49, the housing structure 20, and the piston structure 30 configured as described above are partitioned as follows to form a plurality of pressure chambers 50. That is, a supply chamber 51 as a pressure chamber 50 is formed in the range between the main body housing 21 and the head valve 41 on the base end side of the head valve 41. A piston upper chamber 52 as a pressure chamber 50 is formed between the piston 33 and the cylinder 31 on the head valve 41 side. A piston lower chamber 53 as a pressure chamber 50 is formed between the piston 33 and the cylinder 31 on the driver 35 side. A return chamber 54 as a pressure chamber 50 is formed between the lower side of the cylinder 31 and the main body housing 21. An exhaust chamber 55 as a pressure chamber 50 is formed between the partition wall 47 and the valve body 42. Furthermore, a valve urging chamber 56 as a pressure chamber 50 is formed in the range between the main body housing 21 and the head valve 41 on the tip side of the head valve 41.
Each of the pressure chambers 50 configured as described above allows compressed air to flow from the pressure accumulating chamber 71 disposed in the handle portion 70 described above in accordance with the operation of the operation trigger 732 by the user, or to be described below. By exhausting the outside of the tool body 15 through the mouth structure 80, the internal air pressure is changed. Thus, by changing the internal pressure of each pressure chamber 50, a series of nail driving operations are performed.

As described above, each pressure chamber 50 defined by the head valve 41, the partition wall 47, the check valve 49, the housing structure 20, and the piston structure 30 is driven to drive a nail by changing the pressure as follows. do.
That is, when the trigger valve 73 is turned on by pulling the operation trigger 732 by the user, the communication state between the pressure accumulating chamber 71 and the supply chamber 51 is blocked, and between the pressure accumulating chamber 71 and the valve energizing chamber 56. The communication state of is cut off. That is, when the trigger valve 73 is turned on, the supply of compressed air from the pressure accumulation chamber 71 to the supply chamber 51 and the valve urging chamber 56 is interrupted. Until the trigger valve 73 is turned on, the pressure accumulating chamber 71 and the supply chamber 51 are in communication with each other, and the pressure accumulating chamber 71 and the valve urging chamber 56 are in communication with each other. Thus, compressed air is supplied from the pressure accumulation chamber 71 to the supply chamber 51 and the valve urging chamber 56. For this reason, the supply chamber 51 and the valve urging chamber 56 are filled with compressed air having the same pressure as the pressure accumulation chamber 71.

  Here, after the trigger valve 73 shuts off the supply of the compressed air to the valve urging chamber 56 as described above, the trigger valve 73 further includes the compressed air existing inside the valve urging chamber 56 in the atmosphere. Opened. As a result, the pressure inside the valve urging chamber 56 decreases, and the urging force that urges the valve main body 42 together with the urging spring 44 decreases, and the valve main body 42 moves downward. Accordingly, the first contact portion 421 is separated from the seat portion 43, and the head valve 41 is opened. That is, the head valve 41 is moved down so as to change from the valve closed state to the valve open state in the order of FIGS. 4, 5, and 6. Here, when the head valve 41 is in the valve open state, the compressed air existing in the supply chamber 51 flows into the piston upper chamber 52 in the cylinder 31 through the proximal end side communication hole 311 as shown in FIG. Then, the compressed air flowing into the piston upper chamber 52 increases the internal pressure of the piston upper chamber 52 and moves the piston 33 downward. That is, as shown in FIG. 7, the driver 35 integrated with the piston 33 moves instantaneously in the driving direction and enters the insertion path 65 of the driving unit 60. At this time, the driver 35 drives the nail sent from the magazine 75 toward the driving material W. After the driver 35 drives the nail toward the driving material W in this way, the compressed air existing inside the piston upper chamber 52 flows into the return chamber 54 outside the cylinder 31 through the intermediate communication hole 313 and the communication hole 472. . A check valve 49 is disposed outside the communication hole 472 serving as an inlet to the return chamber 54. For this reason, even if the pressure inside the piston upper chamber 52 becomes low, the back flow from the return chamber 54 into the cylinder 31 is prevented, and the pressure inside the return chamber 54 is maintained. The return chamber 54 is in communication with the piston lower chamber 53 in the cylinder 31 through the front end side communication hole 312.

On the other hand, when the trigger valve 73 is turned off when the user removes the pulling state of the operation trigger 732, the pressure accumulation chamber 71 and the supply chamber 51 are returned to the communication state, and the pressure accumulation chamber 71 and the valve are attached. The communication between the force chambers 56 is also returned. That is, when the trigger valve 73 is turned off, the supply of compressed air from the pressure accumulation chamber 71 to the supply chamber 51 and the valve urging chamber 56 is resumed. For this reason, the supply chamber 51 and the valve urging chamber 56 are filled with compressed air having the same pressure as the pressure accumulation chamber 71. As a result, the pressure inside the valve urging chamber 56 increases, and the urging force that urges the valve main body 42 together with the urging spring 44 increases, and the valve main body 42 moves upward. Accordingly, the first contact portion 421 comes into contact with the seat portion 43, and the head valve 41 enters the valve closed state.
That is, the head valve 41 returns from the valve open state to the valve closed state. When the head valve 41 is in the valve closed state, the flow of compressed air from the supply chamber 51 to the piston upper chamber 52 stops, and the piston upper chamber 52 and the exhaust chamber 55 communicate with each other. Then, the compressed air existing in the piston upper chamber 52 can flow out toward the exhaust chamber 55. At this time, since the exhaust chamber 55 communicates with an exhaust port structure 80 described later, the compressed air existing in the piston upper chamber 52 is released to the atmosphere via the exhaust chamber 55 and the exhaust port structure 80. . That is, the pressure inside the piston upper chamber 52 is atmospheric pressure. Here, the pressure of the compressed air existing in the piston lower chamber 53 that communicates with the return chamber 54 overcomes the pressure in the piston upper chamber 52 that is lowered to the atmospheric pressure, and the piston 33 is moved up. Become. That is, the piston 33 integrated with the driver 35 moves up so as to return to the initial position shown in FIG. That is, the return air that has flowed into the return chamber 54 outside the cylinder 31 reuses the compressed air that has flowed into the piston upper chamber 52 in order to drive the piston 33 into operation. With the return air flowing into the return chamber 54, the piston 33 after being driven can be returned to the initial position before being driven.

Next, the exhaust port structure 80 communicating with the exhaust chamber 55 will be described. The exhaust port structure 80 is a structure in which the compressed air that has flowed into the exhaust chamber 55 as described above passes through the exhaust chamber 55 and the outside of the tool body 15 so as to be released to the atmosphere. The compressed air that has flowed into the exhaust chamber 55 corresponds to unnecessary air that is present inside the tool body 15 after being driven.
FIG. 8 is a partially cutaway sectional view showing the exhaust port structure 80 so as to be visible. FIG. 9 is an enlarged cross-sectional view showing the exhaust port structure 80 shown in FIG. 8 in an enlarged manner. As shown in FIG. 8, the exhaust port structure 80 is disposed on the side surface of the tool housing 15 along the tip direction that is the nail driving direction among the side surfaces of the main body housing 21. The exhaust port structure 80 includes an external air outlet 84 that communicates with the outside of the tool body 15 when the compressed air existing in the piston upper chamber 52 is opened to the atmosphere.
As shown in FIG. 9, the exhaust port structure 80 is generally formed by screwing an exhaust cover 83 to the main body housing 21. As shown in FIGS. 1 and 2, the exhaust cover 83 has six external outlets 84 (84 a, 84 b, 84 c, 84 d, 84 e, 84 f) formed on each of the left and right sides of the tool body 15. The six external outlets 84 on each of the left and right sides are formed to have an opening shape that communicates with the exhaust chamber 55 formed inside the main body housing 21. That is, the body housing 21 to which the exhaust cover 83 is screwed is provided with a communication hole (not shown) that communicates with the exhaust chamber 55 so as to communicate with the external blowout port 84. The external outlet 84 is formed in a symmetrical structure with respect to the tool body 15. The air blowing direction exhausted from the external blowing port 84 to the outside of the tool body 15 is set to be inclined in the direction along the nail driving direction. That is, the air blowing from the external blowing port 84 is set in a direction toward the driving material W that is inclined toward the tip side of the tool main body 15.

  Here, as shown in FIG. 2 and FIG. 3, the external blowout ports 84 provided on the left and right sides of the tool body 15 are arranged in a direction that intersects the driving direction of the driving tool. They are arranged in a plurality of two stages in the direction. Specifically, the external outlets 84a, 84b, and 84c and the external outlets 84d, 84e, and 84f are formed in two stages in the front-rear direction so as to be symmetrical with each other. Further, the external outlets 84a, 84b, 84c and the external outlets 84d, 84e, 84f, which are set in two stages in this way, are arranged three by three along the driving direction of the driving tool (the vertical direction specified in the figure). Is formed. That is, the two external outlets 84a, 84b, 84c and the external outlets 84d, 84e, 84f along the driving direction of the driving tool (the vertical direction specified in the drawing) are symmetrical with each other in the front-rear direction. Are arranged side by side. In addition, since the direction of the air blowing from these external blowing outlets 84 is set in the direction facing the driving material W as described above, these six external blowing outlets 84a, 84b, 84c, 84d, 84e, and 84f. Each has a guide shape such that the direction of air blowing is along the direction facing the driving material W.

Specifically, the exhaust port structure 80 is formed as follows.
The exhaust port structure 80 is disposed on the left and right side surfaces along the nail driving direction among the side surfaces of the main body housing 21. The exhaust port structure 80 generally includes an exhaust filter 81, a fastener 82, and an exhaust cover 83. The exhaust filter 81 is disposed between the main body housing 21 and the exhaust cover 83, and is disposed over the opening range of the external outlet 84. For this reason, the blowout of the air sent from the exhaust chamber 55 and blown out of the tool body 15 is buffered by the exhaust filter 81. The fastener 82 includes a screw member 821 and a washer 822, and screws the exhaust cover 83 to the main body housing 21.
The exhaust cover 83 is formed as a molded part made of plastic resin. The exhaust cover 83 is formed with six external outlets 84 as described above. The exhaust cover 83 is a member corresponding to the cover body according to the present invention, and is attached to the outer periphery of the main body housing 21 while a part of the protector 90 is interposed between the exhaust cover 83 and the main body housing 21. The exhaust cover 83 is provided with an external blowing port 84 for blowing compressed air to the outside of the tool body 15, and is provided with a retaining hole 851 and a protruding hole 852.

The fastening hole 851 is a hole provided so that the exhaust cover 83 can be screwed to the main body housing 21 by a screw member 821 (fastener 82). Further, the protruding hole 852 is a hole provided so as to expose the protruding bumper portion 95, which is a part of the protector 90 interposed between the main body housing 21 and the exhaust cover 83. The protruding hole 852 is a hole corresponding to the through hole according to the present invention, and is formed in a shape that allows the protruding bumper portion 95 that is a part of the protector 90 to protrude outward. Further, as shown in FIGS. 1 and 2, the shape of the protruding hole 852 is formed to extend so as to coincide with the direction in which the handle portion 70 extends, and is formed according to the shape of the external outlet 84. The appearance design of the air driving tool 10 is improved.
The exhaust cover 83 is supported by the main body housing 21 and the top cap 25 when fastened by the fasteners 82. That is, when the exhaust cover 83 is fastened by the fasteners 82, leg portions 86 that receive support from the outer peripheral surface 211 of the main body housing 21 are provided in a state in which the sandwiching portion 92 of the protector 90 is interposed. Further, when the exhaust cover 83 is fastened by the fasteners 82, a pressing portion 87 is provided that receives and supports the outer peripheral surface 251 of the top cap 25. More specifically, the pressing portion 87 of the exhaust cover 83 presses the inner peripheral surface 261 of the mounting portion 26 of the top cap 25 toward the coupling portion 22 of the main body housing 21 (toward the inner peripheral side).
The sandwiching portion 92 of the protector 90 is elastically deformed by sandwiching between the outer peripheral surface 211 of the main body housing 21 and the leg portion 86 of the exhaust cover 83, and the exhaust cover 83 is in close contact with the main body housing 21 by this elastic deformation. Is secured. On the other hand, the pressing portion 87 of the exhaust cover 83 simply comes into contact with the outer peripheral surface 251 of the top cap 25 and presses the outer peripheral surface 251 of the top cap 25.

As described above, the protector 90 is formed by molding an elastically deformable elastomer, and includes an appearance design portion 91 so as to enhance the appearance design of the air driving tool 10. The protector 90 is formed in a shape corresponding to the appearance design of the exhaust cover 83. Specifically, a bank portion 93 is formed along the surface shape of the outer peripheral surface 831 of the exhaust cover 83. In addition, an appropriate positioning convex portion 94 is provided around the protector 90 around which the leg portion 86 of the exhaust cover 83 contacts. As described above, the sandwiching portion 92 of the protector 90 that is sandwiched between the outer peripheral surface 211 of the main body housing 21 and the leg portion 86 of the exhaust cover 83 is elastically deformed by the sandwiching. Due to the elastic restoring force of the sandwiching portion 92 thus configured, the adhesion performance (sealability) of the exhaust cover 83 to the main body housing 21 can be enhanced.
The protector 90 includes a protruding bumper portion 95 that protrudes to the outside through the protruding hole 852 of the exhaust cover 83 and is exposed. When the protruding bumper portion 95 is formed as the protector 90, it is integrally formed with the appearance design portion 91, the sandwiching portion 92, and the bank portion 93. That is, the protector 90 is a member formed of an elastically deformable elastomer so as to include the appearance design portion 91, the sandwiching portion 92, the bank portion 93, and the protruding bumper portion 95.
As shown in FIG. 9, the protruding bumper portion 95 protrudes to the outside through the protruding hole 852 of the exhaust cover 83. As shown in FIGS. 1 and 2, the protruding bumper portion 95 is formed according to the shape of the protruding hole 852 of the exhaust cover 83. Further, the protruding bumper portion 95 is formed to protrude outward from the exhaust cover 83. That is, the protruding bumper portion 95 is formed such that the position of the outer peripheral end 951 of the protruding bumper portion 95 protrudes further outward than the outer end position of the outer peripheral surface 831 of the exhaust cover 83, and the protruding bumper portion 95 is formed.

Next, the attachment structure of the main body housing 21 and the top cap 25 will be described.
The main body housing 21 is formed by selecting magnesium as a material (molding material). The top cap 25 is formed by selecting aluminum as a material (molding material). That is, the main body housing 21 is formed by molding a material having a lower specific gravity than the top cap 25 and a weak strength. For this reason, the main body housing 21 is formed to be lower in rigidity than the top cap 25, but the main body housing 21 itself can be reduced in weight. In other words, the top cap 25 is formed by molding a material having a strength stronger than that of the main body housing 21, and thus has a higher rigidity than the main body housing 21.
As shown in FIG. 9, a top cap 25 is attached to the driving proximal end side opening 23 of the main body housing 21 thus formed. That is, the attachment portion 26 of the top cap 25 with respect to the driving proximal end opening 23 of the main body housing 21 is arranged so that the edge 24 of the driving proximal end opening 23 of the main housing 21 is the inner periphery of the attachment portion 26 of the top cap 25. It is set to be arranged on the surface 261 side. That is, the main body housing 21 and the top cap 25 are screwed at four points (see FIGS. 1 and 2) so that the coupling portion 22 of the main body housing 21 and the attachment portion 26 of the top cap 25 overlap each other. Numeral 29) is integrated. More specifically, the length of the outer peripheral diameter of the coupling portion 22 of the main body housing 21 is set to be shorter than the length of the inner peripheral diameter of the mounting portion 26 of the top cap 25. It is supposed to enter the circumference side.

For this reason, the end edge 24 of the driving base end side opening 23 of the main body housing 21 is arranged on the inner peripheral surface 261 side of the attachment portion 26 of the top cap 25. Specifically, the outer peripheral surface 221 of the coupling part 22 including the edge 24 of the driving proximal end opening 23 of the main body housing 21 is in contact with the inner peripheral surface 261 of the attachment part 26 of the top cap 25. , These are combined. Here, as described above, the main body housing 21 and the top cap 25 have different rigidity due to different molding materials. Therefore, the rigidity of the mounting portion 26 of the top cap 25 is also the driving base of the main body housing 21. The rigidity is higher than the rigidity of the coupling portion 22 including the end opening 23.
An O-ring 28 is interposed between the coupling part 22 of the main body housing 21 and the attachment part 26 of the top cap 25 so as to be elastically deformed. The O-ring 28 acts to enhance the close contact state between the coupling portion 22 of the main body housing 21 and the attachment portion 26 of the top cap 25.
A pressing portion 87 of the exhaust cover 83 is in contact with the outer peripheral surface 262 of the mounting portion 26 of the top cap 25. That is, the exhaust cover 83 described above has a pressing portion 87 that is supported by the main body housing 21 and extends so as to contact the outer peripheral surface 262 of the mounting portion 26 of the top cap 25. By the contact of the pressing portion 87, the expansion of the outer peripheral side of the mounting portion 26 of the top cap 25 is suppressed. That is, the pressing portion 87 of the exhaust cover 83 supports the attachment portion 26 of the top cap 25 toward the coupling portion 22 of the main body housing 21 (toward the inner peripheral side). Further, the deformation of the coupling portion 22 of the main body housing 21 can be suppressed by the pressing by the pressing portion 87 of the exhaust cover 83 via the mounting portion 26 of the top cap 25.

According to the air driving tool 10 described above, the following operational effects can be achieved.
That is, according to the air driving tool 10 described above, the head valve 41 is configured to open the valve so as to send compressed air to the piston upper chamber 52 by movement along the driving direction of the nail (driving tool). It is possible to eliminate the provision of a valve urging member for closing the valve at a site opposite to the nail driving direction. As a result, the length of the air driving tool 10 in the driving direction can be shortened. Further, according to the air driving tool 10, the compressed air existing in the exhaust chamber 55 of the tool body 15 after driving is applied to the side surface along the nail driving direction of the side surface of the body housing 21 of the tool body 15. An exhaust port structure 80 for exhausting the outside of the tool body 15 is provided. Accordingly, it is possible to eliminate the arrangement of the exhaust port structure along the machine length direction in the driving direction, and it is possible to shorten the machine length in the driving direction. Therefore, according to this air driving tool 10, the bulk as the air driving tool 10 can be reduced as much as possible, and the ease of use as a tool can be further improved.
Further, according to the air driving tool 10 described above, the exhaust cover 83 is attached to the outer periphery of the main body housing 21 via the sandwiched portion 92 of the protector 90 that has elasticity and forms the exterior of the main body housing 21. Therefore, the protector 90 can enhance the assembled state between the main body housing 21 and the exhaust cover 83. Further, according to the air driving tool 10 described above, the protector 90 is an elastomer molded member that is an elastic material, and the exhaust cover 83 is elastically deformed by the sandwiching portion 92 of the protector 90 interposed between the body housing 21. Thus, the close contact with the main body housing 21 is ensured. As a result, the assembly state of the main body housing 21 and the exhaust cover 83 can be enhanced, and the stability of the exhaust function can be further ensured satisfactorily.

Further, according to the air driving tool 10 described above, the protector 90 is formed so as to protrude further outward than the outer peripheral surface 831 of the exhaust cover 83. For example, the air driving tool 10 is dropped or the like. Even when it touches the ground, the exhaust cover 83 can be protected from being damaged by the shape protruding to the outside of the protector 90. Further, according to the air driving tool 10 described above, the protector 90 interposed between the main body housing 21 and the exhaust cover 83 protrudes further outward from the outer peripheral surface 831 of the exhaust cover 83 through the protruding hole 852. Therefore, the protector 90 protruding outward can be disposed close to the exhaust cover 83. As a result, even when the air driving tool 10 is dropped on the ground, for example, it is more effective due to the shape of the protruding bumper portion 95 of the protector 90 disposed close to the exhaust cover 83. The exhaust cover 83 can be protected so as not to be damaged.
Further, according to the air driving tool 10 described above, the external air outlets 84a, 84b, 84c and the external air outlets 84d, 84e, 84f are formed in a symmetric shape with two stages in the front-rear direction. Therefore, it is possible to efficiently form a region facing the outside for exhaust. Further, according to the air driving tool 10 described above, the external blowing ports 84a, 84b, 84c and the external blowing ports 84d, 84e, 84f, which are set in two stages in this way, are driven in the driving direction of the driving tool (specified in the figure). Since three of them are arranged along the (vertical direction), a region facing the outside for exhaust can be formed more efficiently.
Further, according to the air driving tool 10 described above, the blowing direction from the external blowing port 84 for exhausting unnecessary compressed air is set to be inclined in the direction along the nail driving direction. The direction can be directed toward the driving target, and the comfort during use can be enhanced. Further, according to the air driving tool 10 described above, the return air for returning the piston 33 to the initial position after driving the piston 33 reuses the compressed air that has flowed into the piston upper chamber 52 to drive the piston 33. Therefore, the compressed air for driving in can be used efficiently.

It should be noted that the air driving tool according to the present invention is not limited to the above-described embodiment, and may be configured with appropriate changes as follows.
For example, in the above-described embodiment, the air nail driving is exemplified and described as the air driving tool according to the present invention. However, the air driving tool according to the present invention is not limited to this, and is configured as an air driving tool that uses compressed air as a driving source and drives finishing nails, tackers, and the like as driving tools. May be.
Further, the shapes of the exhaust cover 83 (cover body) and the protector 90 in the above-described embodiment are one embodiment relating to the exhaust port structure according to the present invention, and the materials and shapes of the exhaust cover and the protector are as follows. Without being limited to this example, it is possible to select an appropriate material and shape. That is, the above-described protector 90 is molded using an elastomer having elasticity (soft elastic material) as a material. However, the protector material may be molded from a rubber resin material having elasticity.
In addition, the air pressure of the compressed air used as the drive source of the air driving tool 10 in the above-described embodiment is from a normal pressure (about 8 kg / cm ² ) to a high pressure (about 23 kg / cm ^2). ) Although it is used to some extent, it may be any.

DESCRIPTION OF SYMBOLS 10 Pneumatic driving tool 15 Tool main body 20 Housing structure 21 Main body housing 211 Outer peripheral surface of main body housing 22 Bonding portion of main body housing 221 Outer peripheral surface of bonding portion 23 Implanted proximal end opening 24 Edge of driven proximal end opening 25 Top Cap 251 Top cap outer peripheral surface 26 Mounting part 261 Mounting part inner peripheral surface 262 Mounting part outer peripheral surface 28 O-ring 29 Screw fastening part 30 Piston structure 31 Cylinder 311 Base end side communication hole 312 Tip side communication hole 313 Intermediate part communication Hole 33 Piston 35 Driver 37 Damper member 371 Top dead center damper 372 Bottom dead center damper 40 Valve structure 41 Head valve (main valve)
42 Valve body 421 First contact portion 422 Second contact portion 423 Communication hole 43 Seat portion 44 Energizing spring 47 Partition wall 471 Outer sliding surface 472 Communication hole 49 Check valve 50 Pressure chamber 51 Supply chamber 52 Piston upper chamber 53 Piston lower chamber 54 Return chamber 55 Exhaust chamber 56 Valve urging chamber 57 O-ring 60 Driving portion 62 Contact top 65 Insertion passage 70 Handle portion 71 Pressure accumulating chamber 72 Hose joint portion 73 Trigger valve 731 Trigger valve body 732 Operation trigger 75 Magazine 76 Connecting portion 77 Hook 80 Exhaust port structure 81 Exhaust filter 82 Fastener 821 Screw member 822 Washer 83 Exhaust cover (cover body)
831 Outer peripheral surface 84 (84a, 84b, 84c, 84d, 84e, 84f) External outlet 851 Retaining hole 852 Projecting hole (through hole)
86 Leg part 87 Press part 90 Protector 91 Appearance design part 92 Clamping part 93 Bank part 94 Positioning convex part 95 Protruding bumper part 951 Outer edge W Driving material (target to be driven)

Claims (8)

An air driving tool for driving a driving tool using compressed air as a driving source,
Tool body causing the driving driving force, a driver for driving a driven member, a piston for actuating driving the driver, a main valve for opening and closing the compressed air inlet of the piston chamber to actuate implanted to the piston , Is built in the housing structure ,
The main valve is configured to open the valve so as to send the compressed air to the piston upper chamber by movement along the driving direction of the driving tool,
Of the side surface of the main body housing of the tool body, the side side surface along the driving direction of the driving tool has an exhaust port structure for discharging unnecessary air existing inside the tool body after driving to the outside of the tool body. Provided ,
The exhaust port structure includes a cover body that is disposed on an outer periphery of the main body housing and is formed with an external outlet for exhausting the unnecessary air.
The cover body has elasticity and is fixed to the outer peripheral surface of the main body housing with a part of a protector that forms an exterior of the main body housing,
The protector is a molded member of an elastic material,
The cover body is secured to the main body housing by elastic deformation of the protector partially interposed between the cover body and the main body housing,
The housing structure is configured by combining a main body housing and a top cap disposed on the driving base end side of the main body housing,
The air driving tool according to claim 1, wherein the cover body is provided with a pressing portion that abuts on an outer periphery of the top cap that is overlaid on an outer periphery of the main body housing . In the air driving tool according to claim 1,
The air driving tool according to claim 1, wherein the pressing portion abuts against an opening edge of the top cap on a tip side . In the air driving tool according to claim 1 or 2,
An air driving tool characterized in that exhaust of the unnecessary air by the exhaust port structure is enhanced in exhaust function from the external blow-out port by close contact with the main body housing via the protector . In the air driving tool according to any one of claims 1 to 3,
The air driving tool according to claim 1, wherein the protector is formed to have a shape protruding further outward than the outer peripheral surface of the cover body. In the air driving tool according to any one of claims 1 to 4,
The cover body is provided with a through hole that exposes the protector partially interposed between the cover body and the body,
The air driving tool, wherein the protector interposed between the main body housing and the cover body protrudes further outward than the outer peripheral surface of the cover body through the through hole. In the air driving tool according to any one of claims 1 to 5,
An air driving tool according to claim 1, wherein a plurality of the external outlets are arranged in a direction crossing a driving direction of the driving tool. In the air driving tool according to any one of claims 1 to 6,
A plurality of the external outlets are arranged along the driving direction of the driving tool,
An air driving tool characterized in that a blowing direction from the external blowing port for exhausting the unnecessary air is set to be inclined in a direction along a driving direction of the driving tool. In the air driving tool according to any one of claims 1 to 7,
The return air that returns the piston to the initial position after the piston is driven is set so as to reuse the compressed air that has flowed into the piston upper chamber in order to drive the piston. Air driving tool.

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