JP7411995B2 - hammer striking device - Google Patents

Description

The present invention relates to an air cylinder type impact tool that reciprocates a hammer body by the inflow of compressed air, and a hammer impact device equipped with the air cylinder type impact tool.

For example, a blow tool operated by compressed air is used as a tool for pounding sand or the like to level the ground. Percussion tools that use compressed air are used for outdoor earthmoving work because they can be lightweight and compact. As such an impact tool, for example, the structure of Patent Document 1 has been proposed. In this configuration, by flowing compressed air, a piston disposed within the cylinder is reciprocated in the front and back direction, and the chisel is struck and vibrated. The vibration of the chisel allows the earth-grading work to be carried out.

Further, the impact tool can be used not only for leveling work but also for, for example, impacting and removing unnecessary parts of castings (parts formed by sprues, etc.). For such work, the impact tool is fixed above a mounting table on which the casting is placed. That is, the cast product removed from the mold is placed on the mounting table and the impact tool is driven to remove unnecessary parts of the cast product. In this way, the impact tool can also be used in the manufacturing process of cast products.

Japanese Patent Application Publication No. 2007-175797

The above-mentioned conventional impact tool operated by compressed air has a piston that reciprocates within a cylinder using the compressed air and a chisel that is struck by the piston, which are separate members. In addition to such conventional configurations, a configuration in which the piston and chisel are integrated (hereinafter referred to as a hammer body) is also known. In this configuration, the hammer body is reciprocated by the compressed air, and the tip of the reciprocating hammer body is used for the earth leveling work, the work of removing unnecessary parts of the casting, and the like.

As mentioned above, impact tools equipped with a hammer body are stored by being hung from hooks attached to walls, shelves, etc., because they are small and lightweight, and to save space. may be done. In this case, the hammer body is generally stored with its tip facing downward.
However, when this impact tool is hung when it is stored after use, the hammer body may sometimes move down rapidly. Therefore, for example, if another member is placed directly below the impact tool, or if the impact tool is stored directly above another member, there is a risk that the other member may be damaged by the sudden drop of the hammer body. was there.
Similarly, in the configuration in which the impact tool is disposed above the mounting table as described above, there is a risk of damaging the mounting table due to the hammer body rapidly descending after the impact tool is used. Furthermore, in some cases, there is a risk that fingers may be caught between the mounting table and the hammer body, so improvements have been required from a safety standpoint.

The present invention proposes an air cylinder type impact tool and a hammer impact device that can prevent a hammer body from rapidly descending after use and prevent damage to members below the hammer body due to the rapid descent. It is something to do.

A first aspect of the present invention provides a cylinder, a sliding part disposed inside the cylinder so as to be slidable in the vertical direction and partitioning the inside of the cylinder into an upper inner air space and a lower inner air space; A rod portion that projects downward from the sliding portion and projects downward through a sliding hole opened downward at the lower end of the cylinder, and a striking portion provided at the lower end of the rod. an integrated hammer body, an operating means for converting between an operating state in which compressed air can flow into the cylinder and a stopped state in which the compressed air cannot flow into the cylinder; and in the operating state by the operating means, the compressed air an air cylinder-type impact tool, comprising pressure converting means that alternately increases and decreases the internal pressures in the upper and lower internal air spaces of the cylinder by the inflow of air, and repeatedly reciprocates the sliding part in the vertical direction, A spring member capable of supporting the hammer body while in elastic contact with the sliding portion of the hammer body is disposed in the lower inner air space of the cylinder, and the lower inner air space communicates with the outside in the cylinder. This is an air cylinder type impact tool characterized by being provided with a pore portion that allows the

The inventors of the present invention have conducted extensive studies on the above-mentioned conventional configuration in which the hammer body is reciprocated using compressed air, and have found that if the tip of the hammer body is stored with the tip facing downward, the weight of the hammer body will cause the cylinder to move. It was discovered that the internal pressure of the hammer body changes, causing the hammer body to drop rapidly. The present invention has been achieved based on the knowledge obtained through intensive study by the inventors.

In the structure of the present invention, since the pores are provided in the lower internal air space inside the cylinder, the internal pressure of the lower internal air area is controlled by the pores when the compressed air is stopped flowing. Can reduce pressure. Therefore, even if the internal pressure of the lower inner space is higher than that of the upper inner space in the stopped state, the pressure of the lower inner space can be gradually reduced by the pores. Here, the pore portion needs to have a relatively small diameter that does not prevent an increase in the internal pressure in the lower internal space so that the hammer body can move upward in the operating state where compressed air is flowing in. According to these pores, the internal pressure of the lower internal air space can be gradually reduced in the stopped state, so when the striking part of the hammer body is stored facing downward as described above, the rapid descent of the hammer body is suppressed. and the hammer body can be lowered relatively slowly.
Furthermore, since a spring member is disposed in the lower internal air space inside the cylinder, the descending speed of the hammer body that descends during storage can be suppressed, and the rapid descent of the hammer body can be suppressed. Contribute.
Therefore, according to the configuration of the present invention, when the hammer body is stored with the striking part facing downward after use, it is possible to prevent the hammer body from dropping rapidly, and therefore a separate member is placed below the storage position. Even in such a case, it is possible to prevent the other member from being damaged or fingers from being caught due to a collision with the hammer body, thereby improving safety performance.

In addition, as mentioned above, this structure is equipped with a spring member that comes into elastic contact with the hammer body in the lower internal air space inside the cylinder, which reduces vibrations caused by the reciprocating movement of the hammer body when compressed air is flowing in. can. As a result, the configuration of the present invention can suppress the vibrations transmitted to the operator when the operator holds the apparatus in his hand and works, and can also reduce the noise caused by the vibrations.

A second invention of the present invention provides the air cylinder type impact tool of the first invention described above, and an object to be hit by the impact part of the hammer body disposed below the air cylinder type impact tool and reciprocating in the vertical direction. A hammer striking device is provided with a mounting table on which an object is placed, and the air cylinder type striking tool is configured such that the striking part of the hammer body is in contact with the upper surface of the mounting table when the air cylinder type striking tool is stopped by the operating means. , and the hammer striking device is characterized in that the spring member is provided so as to come into elastic contact with the sliding portion of the hammer body in an elastically contracted state.

In this configuration, since the air cylinder type impact tool of the first invention is provided, the hammer body can be gradually lowered after using the air cylinder type impact tool. According to this configuration, after the air cylinder type impact tool is used, it is possible to suppress the hammer body from dropping rapidly, so it is possible to suppress damage to the mounting table due to a collision between the mounting table and the striking part of the hammer body. Furthermore, in this configuration, since the striking part of the hammer body is provided so as to come into contact with the top surface of the mounting table in the stopped state, there is a gap between the hammer body and the mounting table during storage in the stopped state. It is possible to prevent dust from adhering to the holder or other parts from being placed on the holder by mistake. Further, by providing the spring member as described above, there is an advantage that the load of the hammer body is continuously and strongly applied to the mounting table, and load can be suppressed from being applied to the tip of the mounting table and the hammer body.

Furthermore, since the air cylinder type impact tool suppresses the vibration caused by the reciprocating movement of the hammer body as described above, in the hammer impact device of this configuration, the air cylinder type impact tool is arranged above the mounting table. It is possible to suppress the vibration from being transmitted to the supporting means for installing the device. Therefore, it is possible to suppress the positional shift of the air cylinder type impact tool due to the vibration. Furthermore, the hammer impact device with this configuration also reduces the noise generated during use of the air cylinder type impact tool.

According to the air cylinder type impact tool of the present invention, when the hammer body is stored with the impact part facing downward after use, it is possible to prevent the hammer body from dropping rapidly, so that the impact tool is located below the storage position. It is possible to eliminate problems such as damaging another member due to collision with the hammer body, resulting in excellent safety. Further, it is possible to suppress the vibrations generated by the reciprocating movement of the hammer body from being transmitted to the operator, and also suppress the noise generated by the vibrations.
Further, according to the hammer impact device of the present invention, it is possible to suppress the rapid descent of the hammer body after use, and therefore it is possible to suppress damage to the mounting table due to collision with the hammer body. Furthermore, it is possible to suppress the vibration of the hammer body from being transmitted to the support member that supports the air cylinder type impact tool, and it is also possible to reduce noise during use.

1 is a longitudinal cross-sectional view of an air cylinder type impact tool 1. FIG. FIG. 2 is a cross-sectional view of the air cylinder type impact tool 1 in a state where the hammer body 12 is lowered by operating the operating handle 13; FIG. 7 is a front view of a hammer impact device 81 in which the air cylinder type impact tool 1 is disposed on a mounting table 5. FIG. It is an explanatory view showing operation of air cylinder type impact tool 1 in a use state. 5 is an explanatory diagram showing the operation of the air cylinder type impact tool 1 continued from FIG. 4. FIG. FIG. 3 is an explanatory diagram showing the operation of the hammer body 12 when changing from a used state to a stopped state. 7 is an explanatory diagram showing the operation of the hammer body 12 continued from FIG. 6. FIG. 8 is an explanatory diagram showing the operation of the hammer body 12 continued from FIG. 7. FIG.

Embodiments according to the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the air cylinder type impact tool 1 of this embodiment includes a cylindrical cylinder 11, a hammer body 12 that slides along the longitudinal direction (vertical direction) of the cylinder 11, and a hammer body 12 that slides along the longitudinal direction (vertical direction) of the cylinder 11. It is equipped with an operation handle 13 that allows compressed air to flow into the inside of the cylinder 11, and a pressure valve mechanism 14 that sends out the compressed air to one of an upper inner air space 21a and a lower inner air space 21b, which will be described later.

The cylinder 11 includes a cylindrical body 11a, a bottom 11b provided at the bottom of the body 11a, and a ceiling 11c provided at the top of the body 11a, and has a sealed internal space 21. has. A sliding hole 22 is formed vertically through the bottom portion 11b, and an air supply port 23 for supplying compressed air is provided in the ceiling portion 11c. The ceiling portion 11c is provided with an air passage 25 through which compressed air supplied from the air supply port 23 flows into the pressure valve mechanism 14. It communicates with the internal airspace 21. Further, in the ceiling part 11c, there is an on-off valve 26 that converts the air flow path 25 into an open state where the compressed air supplied from the air supply port 23 can pass to the pressure valve mechanism 14 and a closed state where it cannot pass. It is arranged. The on-off valve 26 is provided so that the air passage 25 can be converted into an open state and a closed state by an operation handle 13 that is tiltably disposed on the outer surface of the cylinder 11. As the mechanism for opening and closing the air flow path 25 using the operating handle 13 and the on-off valve 26, a conventionally known mechanism can be applied, so the details will be omitted.

The body part 11a of the cylinder 11 is provided with a body side chamber 30 along its longitudinal direction, and is provided with a first ventilation hole 31a that communicates the lower end of the body side chamber 30 with the lower end of the internal air space 21. There is. The upper end of the body side chamber 30 is communicated with the air passage 25 via the pressure valve mechanism 14 . Furthermore, a second vent hole 31b is provided in the body portion 11a above the first vent hole 31a, which communicates the body side chamber 30 with the internal air space 21. A one-way valve (not shown) is disposed in the second vent hole 31b, which allows air to flow from the internal air space 21 to the body side chamber 30, while allowing air to flow from the body side chamber 30 to the internal air space 21. be rendered uncircumcisable.
In addition, the first ventilation hole 31a is larger than the sliding part 41 of the hammer body 12 that slides in the internal air space 21 in the vertical direction when the sliding part 41 of the hammer body 12 is at the lower limit position of movement (see FIG. 8). It is installed in the lower part.

The hammer body 12 includes a sliding part 41 that slides vertically in the internal air space 21 of the cylinder 11, a cylindrical rod part 42 extending downward from the lower end of the sliding part 41, and a rod part 42 that extends downward from the lower end of the sliding part 41. 42 and a striking portion 43 provided at the lower end thereof are integrally formed. The rod portion 42 is inserted into the sliding hole 22 of the cylinder 11 and protrudes below the cylinder 11. Note that this sliding hole 22 is provided with an O-ring (not shown), so that when the rod portion 42 of the hammer body 12 is inserted into the sliding hole 22, air cannot circulate. ing. However, the O-ring is not an essential component, and it is of course possible to have a configuration that does not use the O-ring.

The sliding portion 41 of the hammer body 12 is formed into a cylindrical shape with a larger diameter and shorter length than the rod portion 42, and the outer diameter of the sliding portion 41 is larger than the inner diameter of the internal air space 21 of the cylinder 11. It has slightly smaller dimensions. A metal C-ring that can be expanded and contracted is disposed on the outer circumferential surface of the sliding portion 41, and the C-ring contacts the inner circumferential surface of the cylinder 11 in the circumferential direction.

As described above, the sliding part 41 disposed in the internal air space 21 of the cylinder 11 divides the internal air space 21 of the cylinder 11 into an upper internal air area 21a above the sliding part 41 and a lower internal air area 21b below. It is divided into. The internal volumes of the upper inner air space 21a and the lower inner air space 21b increase and decrease as the sliding portion 41 moves up and down. That is, when the sliding portion 41 of the hammer body 12 moves downward (see FIG. 4), the internal volume of the upper internal cavity 21a increases, while the internal volume of the lower internal cavity 21b decreases. Conversely, when the sliding portion 41 of the hammer body 12 moves upward (see FIG. 5), the internal volume of the lower internal cavity 21b increases, while the internal volume of the upper internal cavity 21a decreases.

An air passage 25 is communicated with the upper inner space 21a of the inner space 21 via the pressure valve mechanism 14, and the lower inner space 21b is connected to the body through the first ventilation hole 31a. A side chamber 30 is in communication. That is, the first ventilation hole 31a is provided at a position always facing the lower inner air space 21 whose internal volume varies. The body side chamber 30 is communicated with an air passage 25 via the pressure valve mechanism 14 . Here, as described above, since the first ventilation hole 31a is provided below the lower limit position of the movement of the sliding part 41 (see FIG. 8), regardless of the vertical movement of the sliding part 41, , communicates with the lower inner air space 21b. Similarly, an opening (not shown) that communicates the upper internal space 21a and the air flow path 25 is provided above the upper limit position of the movement of the sliding portion 41.

The pressure valve mechanism 14 has an upper inflow state in which the compressed air passing through the air passage 25 flows into the upper internal space 21a, and a lower state in which the compressed air flows into the lower internal space 21b via the body side chamber 30. It converts into an inflow state. Specifically, since the pressure valve mechanism 14 is normally in the upper inflow state, when the on-off valve 26 is opened by operating the operating handle as shown in FIG. Compressed air flows into the upper internal space 21a via the pressure valve mechanism 14. As a result, the internal pressure in the upper internal space 21a increases, and the sliding portion 41 of the hammer body 12 moves downward. With this downward movement of the sliding part 41, the internal pressures in the lower internal space 21b and the body side chamber 30 increase, and due to the increase in internal pressure, the pressure valve mechanism 14 is converted to the lower inflow state, and the air flow path 25 The compressed air that has passed through flows into the lower internal air space 21b via the body side chamber 30. As a result, as shown in FIG. 5, the internal pressure in the lower internal space 21b increases, and the sliding portion 41 of the hammer body 12 moves upward. As the sliding portion 41 moves upward, the internal pressure of the upper internal space 21a increases, and the pressure valve mechanism 14 is converted to the upper inflow state due to the increased internal pressure, and the compressed air passing through the air flow path 25 is flows into the upper inner air space 21a. In this way, when the on-off valve 26 is in the open state, the pressure valve mechanism 14 is repeatedly converted into the upper inflow state and the lower inflow state, so that the sliding portion 41 of the hammer body 12 repeatedly moves back and forth in the vertical direction. .
Incidentally, since a conventionally known pressure valve mechanism 14 can be applied, details thereof will be omitted.

Further, a coil spring 61 that can be expanded and contracted in the vertical direction is arranged in the lower inner space 21b of the cylinder 11, and a coil spring 62 that can be expanded and contracted in the upper and lower directions is arranged in the upper inner space 21a. In this embodiment, the coil spring 61 in the lower inner air space 21b is in elastic contact with the bottom part 11b of the cylinder 11 and the sliding part 41 of the hammer body 12, and the coil spring 62 in the upper inner air space 21a is in contact with the ceiling part 11c. It is in elastic contact with the sliding portion 41. These coil springs 61 and 62 prevent the sliding portion 41 of the hammer body 12, which moves up and down as the compressed air flows into the upper internal space 21a, from colliding with the ceiling portion 11c and bottom portion 11b of the cylinder 11. This can be prevented, and vibrations caused by the vertical movement of the sliding portion 41 can be reduced.

Here, due to the elastic force (elastic coefficient) of the coil springs 61 and 62 and the inflow pressure of compressed air flowing into the upper inner air space 21a and the lower inner air space 21b, the sliding portion 41 moves the inner air space 21 of the cylinder 11. A lower limit position of movement (see FIG. 8) and an upper limit position of movement that can be moved up and down are determined.
In this embodiment, the lower limit position of movement is the lower limit position to which the sliding part 41 can move, and the lower limit position ( (see FIG. 5(A)). Similarly, the upper limit position of movement is the upper limit position to which the sliding portion 41 can move, and is higher than the upper limit position (see FIG. 4(A)) when reciprocating due to the inflow of compressed air. be. That is, when the compressed air flows in, the sliding portion 41 reciprocates in the vertical direction between the lower limit position and the upper limit position with a predetermined stroke narrower than the interval between the lower limit position and the upper limit position. . Such a stroke is determined by the flow rate of compressed air, the volume of the internal air space 21, and the like.

Further, the body portion 11a of the cylinder 11 is provided with a pore portion 65 that communicates the lower inner space 21b with the outside. Here, the pore portion 65 is formed so that its pore cross-sectional area (air passage area) is smaller than the pore cross-sectional areas of the first vent hole 31a and the second vent hole 31b. As a result, when the sliding portion 41 of the hammer body 12 moves downward, air in the lower internal air space 21b easily flows into the body side chamber 30 through the first ventilation hole 31a and the second ventilation hole 31b, and The compressed air flowing in through the body side chamber 30 can stably increase the internal pressure in the lower internal space 21b. In this way, the influence of the pores 65 (air outflow to the outside via the pores 65) can be suppressed as much as possible on the pressure change in the lower inner space 21b caused by the inflow of compressed air. As described above, the sliding portion 41 of the hammer body 12 can be stably and repeatedly moved back and forth.

Next, the hammer impact device 81 equipped with the above-mentioned air cylinder type impact tool 1 will be explained.
As shown in FIG. 3, the hammer striking device 81 includes a mounting table 82 on which a striking object (not shown) to be struck by the hammer body 12 of the air cylinder type striking tool 1 is mounted; A fixed support member 83 for fixing the air cylinder type impact tool 1 at an upper position is provided.

The mounting table 82 includes an upper surface 82a extending in the horizontal direction, and the object to be hit is placed on the upper surface 82a. On the other hand, the fixed support member 83 positions and fixes the air cylinder type impact tool 1 at a predetermined height position from the upper surface 82a of the mounting base 82, and fixes the air cylinder type impact tool 1 by fixing means such as bolts. Fix 1. The air cylinder type impact tool 1 is fixed to the fixed support member 83 so that the impact part 43 of the hammer body 12 faces downward and the longitudinal direction of the cylinder 11 (inner air space 21) is along the vertical direction. As shown in FIG. 8, the height position at which the air cylinder type impact tool 1 is fixed is determined when the sliding portion 41 of the hammer body 12 of the air cylinder type impact tool 1 is set at the lower limit of movement. The striking portion 43 of the hammer body 12 is set to come into contact with the upper surface 82a of the mounting table 82.

Next, the operation of the air cylinder type impact tool 1 that constitutes the hammer impact device 81 of this embodiment will be explained.
The air supply port 23 of the air cylinder impact tool 1 is connected to an air supply device (not shown) such as a compressor that supplies compressed air. When compressed air is supplied to the air supply port 23 and the operating handle 13 is operated to open the air passage 25 as shown in FIG. Compressed air flows into the upper internal space 21a of the cylinder 11 via the mechanism 14. In this way, when the air flow path 25 is in the open state, the pressure valve mechanism 14 is repeatedly converted into the upper inflow state and the lower inflow state as described above, so that the hammer body 12 repeatedly reciprocates up and down (Fig. 4, 5).

By such vertical movement of the hammer body 12, the striking object placed on the upper surface 82a of the mounting table 82 can be repeatedly struck by the striking portion 43 of the hammer body 12. When stopping the vertical movement of the hammer body 12, the operating handle 13 is operated to close the air passage 25. As a result, the flow of compressed air into the upper inner space 21a and lower inner space 21b of the cylinder 11 is stopped, and the hammer body 12 is stopped (see FIG. 6). By operating the operation handle 13 of the air cylinder type impact tool 1 in this manner, it is possible to change the object to be struck placed on the mounting table 82, and it is possible to sequentially impact a plurality of objects to be struck.

On the other hand, when stopping the striking work on the striking object, the supply of compressed air is stopped by operating the operating handle 13, and further the air supply device is stopped. When the air cylinder type impact tool 1 is stopped in this manner, the stopping position of the hammer body 12 differs depending on the timing of stopping the air supply. For example, as shown in FIG. 6, when the stop position of the hammer body 12 is near the upper end of the internal air space 21 of the cylinder 11 (in other words, a position where the volume of the upper internal air space 21a is larger than the lower internal air area 21b) There is also. In this case, the striking part 43 of the hammer body 12 stops at a position spaced upward from the upper surface 82a of the mounting table 82.

In this state where the operation is stopped, no air flows into the upper inner air space 21a and the lower inner air space 21b of the cylinder 11, but the air in the lower inner air space 21b flows out to the outside through the pore portion 65. Therefore, the internal pressure of the lower internal air space 21b gradually decreases. Here, since the pore portion 65 has a small pore diameter as described above, air flows out from the lower internal space 21b relatively slowly. Therefore, the internal pressure in the lower internal space 21b also decreases relatively slowly, and the hammer body 12 gradually descends as shown in FIG. Further, since the descending speed of the hammer body 12 is also suppressed by the elastic force of the coil spring 61 disposed in the lower internal space 21b of the cylinder 11, the hammer body 12 descends more slowly.
Thereafter, as shown in FIG. 8, as the sliding portion 41 of the hammer body 12 reaches the lower limit of movement, the striking portion 43 of the hammer body 12 comes into contact with the upper surface 82a of the mounting table 82. At this time, the coil spring 61 becomes elastically compressed, and the hammer body 12 is supported from below by the coil spring 61. As a result, the hammer body 12 stops descending and is maintained in this state.

Note that a configuration (hereinafter referred to as a configuration of a comparative example) that does not include the above-mentioned pore portion 65 and coil springs 61 and 62 will be described. The configuration of this comparative example is the same as the example except for the pore portion 65 and the coil springs 61 and 62, and corresponds to the conventional configuration described above.
Even in the configuration of the comparative example, the hammer body can be reciprocated up and down by inflowing compressed air by operating the operating handle to repeatedly strike the object to be struck, as in the embodiment. When the sliding part of the hammer body stops at a position close to the upper end of the internal air space of the cylinder due to the supply of compressed air being stopped, the striking part of the hammer body is moved upward from the top surface of the mounting table as in the previous embodiment. It stops at a position separated by . In this state where the operation is stopped, the upper internal air space and the lower internal air space of the cylinder form a closed circuit via the pressure valve mechanism, so although the hammer body temporarily stops at the above-mentioned stop position, the hammer body is under its own weight. As a result, the internal pressure in the lower internal air space and the body side chamber increases. When the internal pressure of the lower inner air space 21b and the body side chamber 30 reaches the pressure that activates the pressure valve mechanism, air flows from the lower inner air space 21b to the upper inner air space 21a, reducing the pressure of the lower inner air space 21b and the upper inner air space 21a. The pressure increases rapidly. As a result, the hammer body rapidly descends, and the striking portion of the hammer body collides with the upper surface of the mounting table. Therefore, there is a risk that the upper surface of the mounting table may be damaged, and if a member is placed on the mounting table after the operation is stopped, the member may be damaged.

In contrast to the configuration of the comparative example, the configuration of the present example is such that the upper surface 82a of the mounting table 82 is It can prevent you from getting hurt. Furthermore, even if a member is placed on the mounting table 82 after the operation is stopped, damage to the member can be suppressed. Furthermore, since the hammer body 12 descends and comes into contact with the mounting table 82 after the operation is stopped, there is an excellent advantage that it is possible to prevent dust from adhering to the mounting table 82 or the above-mentioned members from being placed on the mounting table 82. be.

Furthermore, in the configuration of this embodiment, since the coil springs 61 and 62 are respectively disposed in the upper inner air space 21a and the lower inner air space 21b of the cylinder 11, vibrations caused by the reciprocating movement of the hammer body 12 are suppressed. be able to. Therefore, it is possible to suppress the fixing means for fixing the air cylinder type impact tool 1 to the fixed support member 83 from loosening due to the vibration, and the state where the air cylinder type impact tool 1 is positioned at the desired fixed position can be maintained for a relatively long period of time. It can be maintained for a long time.

In the embodiment described above, the operating handle 13 and the on-off valve 26 constitute the operating means according to the present invention. The open state of the air flow path 25 corresponds to the operating state of the present invention, and the closed state corresponds to the stopped state of the present invention. Further, the pressure valve mechanism 14 constitutes a pressure converting means according to the present invention. Further, the coil spring 61 disposed in the lower inner air space 21b constitutes a spring member according to the present invention.

The present invention is not limited to the embodiments described above, and it is possible to implement configurations other than the embodiments described above with appropriate changes within the scope of the spirit of the present invention.
For example, a configuration may be adopted in which no coil spring is disposed in the upper internal air space 21a of the cylinder 11. Further, instead of the coil springs 61 and 62 disposed in the upper inner air space 21a and the lower inner air space 21b, respectively, it is also possible to arrange a plate spring or the like.

Further, in the embodiment, the pressure valve mechanism 14 is not limited to this, and may have various configurations as long as it has a function of converting the inflow destination of compressed air into the upper inner air space 21a and the lower inner air space 21b. applicable. Furthermore, other configurations of the pressure valve mechanism 14 are also applicable as long as they have the function of alternately increasing or decreasing the internal pressures of the upper inner space 21a and the lower inner space 21b. For example, it includes a sensor that detects the internal pressure of the upper inner air space 21a and the lower inner air space 21b, and a solenoid valve operated by the sensor, and the solenoid valve communicates the air flow path 25 with the upper inner air space 21a. It can be configured to change between the state and the state of communicating with the lower internal air space 21b.

Further, the hammer striking device 81 of the embodiment is arranged such that the striking part 43 of the hammer body 12 comes into contact with the upper surface 82a of the mounting table 82 when the sliding part 41 of the hammer body 12 is at the lower limit position of movement. However, the configuration is not limited to this, and for example, the striking part 43 may be arranged so as to come into contact with the upper surface 82a of the mounting table 82 when the sliding part 41 is at the position directly above the lower limit position of movement. good.

Further, in the embodiment, the stroke for reciprocating the hammer body 12 is set narrower than the interval between the lower limit of movement position and the upper limit of movement of the sliding part 41, but the invention is not limited to this. It is also possible to configure the hammer body 12 to be reciprocated up and down between the upper limit position and the upper limit position of movement.

Further, in the embodiment, the air cylinder type impact tool 1 constitutes the hammer impact device 81, but the invention is not limited to this, and the air cylinder type impact tool 1 can be carried and used at a predetermined work place. . In this case, since the air cylinder type impact tool 1 is used alone, the operator must hold and operate it. Even when the air cylinder type impact tool 1 is used alone in this way, if the air cylinder type impact tool 1 is stored with the impact part 43 of the hammer body 12 facing downward, As in the embodiment, the hammer body 12 slowly descends to the lower limit position. Thereby, when the air cylinder type impact tool 1 is stored on another member, it is possible to prevent the member from being damaged by the descending hammer body 12.

1 Air cylinder type impact tool 11 Cylinder 12 Hammer body 13 Operating means 14 Pressure valve mechanism 41 Sliding part 42 Rod part 43 Impact part 61 Coil spring 81 Hammer impact device 82 Mounting table

Claims (1)

cylinder and
a sliding part disposed inside the cylinder so as to be slidable in the vertical direction and partitioning the inside of the cylinder into an upper inner air space and a lower inner air space, and a sliding part that projects downward from the sliding part, a hammer body in which a rod protruding downward through a sliding hole opened downward at the lower end of the cylinder and a striking portion provided at the lower end of the rod are integrated;
operating means for converting between an operating state in which compressed air can flow into the cylinder and a stopped state in which the compressed air cannot flow;
Pressure converting means for repeatedly reciprocating the sliding part in an up-down direction by alternately increasing and decreasing internal pressures in an upper internal air space and a lower internal air area of the cylinder by the inflow of the compressed air when the operating means is activated. A spring member capable of supporting the hammer body in elastic contact with the sliding portion of the hammer body is disposed in the lower inner air space of the cylinder , and the lower inner air space and the lower inner air space are disposed in the cylinder. An air cylinder type impact tool that is provided with a pore that communicates with the outside ;
a mounting table disposed below the air cylinder type impact tool, on which is placed an object to be hit by the impact part of the hammer body that reciprocates in the vertical direction;
A hammer striking device comprising:
In the air cylinder type impact tool, the impact part of the hammer body is brought into contact with the upper surface of the mounting table in a stopped state by the operating means, and the spring member is elastically contracted against the sliding part of the hammer body. A hammer striking device characterized in that it is provided so as to come into ballistic contact.

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