JP2016087752A - Water pouring device for power tool and power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a user to easily use, by allowing supply of a cooling medium with a proper amount, always, even when a storage amount of the cooling medium becomes smaller.SOLUTION: A water pouring device 30 for power tool is configured so that, a water pouring port 40 to a bit 10 of a hammer drill 1 is provided on a casing 31 which can be attached to the hammer drill 1, and a water storage tank 43 for storing water serving as a cooling medium and a pump 45 are mounted on the casing. A water pouring controller 47 which receives power supply from the hammer drill 1 operates the pump 45 in linkage with operation of the hammer drill 1 for opening a valve 46, for supplying water in the water storage tank 43 to the water pouring port 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water injection device for an electric tool that is attached to supply a coolant such as water to a tip tool of an electric tool such as an electric drill or a hammer drill, and an electric tool equipped with the water injection device. For convenience of explanation, “water injection” is used, but the cooling medium is not limited to water, and a dedicated coolant may be used.

  Electric tools such as electric drills and hammer drills may be cooled by supplying a cooling medium such as water in order to prevent damage or seizure of the tip tool during drilling work or the like. In order to supply this cooling medium, for example, a water injection device as disclosed in Patent Document 1 is known. The water injection device includes a storage device that is connected to a housing of an electric tool via a guide device and stores a cooling medium, and enables a valve provided at an end of the storage device to be pressed by the pressing body, and the pressing body. In addition, a head abutting on the perforated surface is connected via an adjusting screw, and a supply device connected to the valve is connected to the head. Therefore, when the head is pushed by the drilling operation with the tip tool, the pressing body presses the valve via the adjusting screw to open the valve, and the cooling medium is supplied from the storage device to the tip tool via the supply device. Become.

Japanese Patent Application Laid-Open No. 11-333610

  In the water injection device of the above-mentioned Patent Document 1, since the cooling medium is supplied by opening the valve of the storage device, when the amount of the cooling medium stored decreases, the momentum of the cooling medium supplied decreases or there is a remaining amount. It will not be supplied and will be unusable.

  Accordingly, an object of the present invention is to provide a water injection device for an electric tool and an electric tool that can always supply an appropriate amount of the cooling medium even when the amount of the storage of the cooling medium decreases and is excellent in usability.

In order to achieve the above-mentioned object, the invention according to claim 1 is a water injection device for an electric tool formed by protruding a water injection port to a tip tool of an electric tool on a casing that can be attached to the electric tool, A water storage tank for storing the cooling medium and a pump are mounted, and the cooling medium of the water storage tank can be supplied to the water inlet by the pump.
According to a second aspect of the present invention, in the configuration of the first aspect, the power of the pump is supplied from the electric tool in a mounted state on the electric tool.
According to a third aspect of the present invention, in the configuration of the first aspect, the power source of the pump is provided independently of the electric tool.
According to a fourth aspect of the present invention, in any one of the first to third aspects, the pump operates in conjunction with the operation of the power tool.
According to a fifth aspect of the present invention, in any one of the first to third aspects, a switch for operating the pump is provided.
According to a sixth aspect of the present invention, in the configuration according to any one of the first to third aspects, the water injection port is movable back and forth in the protruding direction of the tip tool, and the pump operates in conjunction with the retraction of the water injection port. It is characterized by doing.
The invention according to claim 7 is characterized in that, in the structure according to any one of claims 1 to 5, the water injection port is movable back and forth in the protruding direction of the tip tool.
The invention according to an eighth aspect is characterized in that, in the configuration according to any one of the first to seventh aspects, the water injection port has a ring shape through which the tip tool can penetrate.
According to a ninth aspect of the present invention, in any one of the first to eighth aspects, a hose that supplies a cooling medium to the water storage tank can be connected.
According to a tenth aspect of the present invention, in the configuration according to any one of the first to ninth aspects, a switching operation unit capable of switching the output of the pump is provided.
In order to achieve the above object, the invention described in claim 11 is an electric tool, which is equipped with the water injection device for an electric tool according to any one of claims 1 to 10. It is.

According to the invention described in claims 1 and 11, the cooling medium can be supplied to the water inlet by the pump, so that the cooling medium is always supplied in an appropriate amount even when the storage amount of the water tank decreases. It is easy to use.
According to the second aspect of the present invention, in addition to the effect of the first aspect, since the power source of the pump is obtained from the electric tool, a dedicated power source becomes unnecessary, leading to weight reduction and cost reduction.
According to the third aspect of the present invention, in addition to the effect of the first aspect, since the power source is provided independently, the power consumption of the power tool is reduced, and if the DC tool is used, the battery power can be reduced. Less frequent charging.
According to the fourth aspect of the present invention, in addition to the effect of any one of the first to third aspects, when the pump is interlocked with the operation of the power tool, the tip is automatically used when the power tool is used. Water can be injected into the tool to enable reliable cooling.
According to the fifth aspect of the present invention, in addition to the effect of any one of the first to third aspects, the switch for operating the pump is provided, for example, for cooling the tip tool after the operation of the power tool is stopped. In addition, it is possible to use the water injection device for the electric tool independently, and the usability is improved.
According to the sixth aspect of the invention, in addition to the effect of any one of the first to third aspects, the pump is operated in conjunction with the retraction of the water inlet, so that the electric tool is operated by the operation of the electric tool before work. The tool water injection device does not operate and consumes unnecessary power and water, and water can be injected at a necessary timing.
According to the seventh aspect of the present invention, in addition to the effect of any one of the first to fifth aspects, the water inlet can be moved back and forth so that the water inlet contacts the work surface even if drilling progresses. It can be kept in position and the tip tool can always be cooled.
According to invention of Claim 8, in addition to the effect in any one of Claims 1 thru | or 7, it became possible to inject water uniformly from the circumference | surroundings of a tip tool by having made the water injection port into the ring shape, and the cooling effect was effective. Rise.
According to the ninth aspect of the invention, in addition to the effect of any one of the first to eighth aspects, the hose that supplies the cooling medium to the water storage tank can be connected, so that when the storage amount is reduced, Thus, the cooling medium can be easily replenished.
According to the invention described in claim 10, in addition to the effect of any one of claims 1 to 9, by providing a pump output switching operation section, an appropriate note corresponding to the type and work of the tip tool is provided. The amount of water can be selected.

It is a longitudinal cross-sectional view of the hammer drill equipped with the water injection device for electric tools. It is a longitudinal cross-sectional view of the water injection apparatus for electric tools. It is a longitudinal cross-sectional view of the example of a change of the water injection apparatus for electric tools. It is a longitudinal cross-sectional view of the example of a change of the water injection apparatus for electric tools. It is a longitudinal cross-sectional view of the example of a change of the water injection apparatus for electric tools.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example in which an electric tool water injection device (hereinafter simply referred to as “water injection device”) is mounted on a hammer drill which is an electric tool, and FIG. 2 shows the water injection device alone.
First, the hammer drill 1 accommodates the motor 3 at the lower part of the front side (the left side in FIG. 1 is the front side) of the housing 2 formed by assembling a pair of left and right halved housings, with the output shaft 4 facing upward. A first gear 7, a clutch 8, and a boss sleeve 9 are provided from the front on the intermediate shaft 6 that transmits torque via the bevel gears 5, 5. Above the intermediate shaft 6, a tool holder 11 into which a bit 10 as a tip tool can be inserted at the tip is pivotally supported in parallel with the intermediate shaft 6, and is attached to the rear end of the piston cylinder 12 loosely inserted behind the tool holder 11. The arm 13 is connected to the boss sleeve 9 via a swash bearing. Inside the piston cylinder 12, a striker 15 is externally movably mounted via an air chamber 14, and an impact bolt 16 provided in front of the striker 15 can be struck. The first gear 7 meshes with the second gear 17 attached to the tool holder 11.

  A handle 18 having a switch 19 and a switch lever 20 is formed on the upper rear side of the housing 2, and a battery pack 21 serving as a power source is mounted below the handle 18. In addition, the front lower portion of the housing 2 is a mounting portion 22 to which the water injection device 30 is mounted, with the front surface inclined downward and protruding forward of the battery pack 21. A controller 23 electrically connected to the coil of the motor 3, the switch 19, and the battery pack 21 is housed in the mounting portion 22, and the front end is forward in the center in the left-right direction on the lower surface of the mounting portion 22. An opening guide groove 24 is recessed in the front-rear direction.

  Further, on the upper front side of the controller 23, a connector 25 is provided in which three female terminals for power supply and communication are arranged in parallel in the left-right direction. The connector 25 has a rectangular tube shape with an opening on the front side, and a recess (not shown) formed on the left and right outer surfaces and a boss (not shown) projecting on the inner surfaces of the left and right half housings, so that the connector 25 is vertically It is supported so that it can rotate in the direction. Further, a shutter portion 26 that is an arc-shaped plate centered on a boss is integrally formed upward at the front end of the upper surface of the connector 25, while a pressing piece is located below the connector 25 at the center of the lower surface of the mounting portion 22. 27 is held so as to be movable in the vertical direction.

  On the other hand, a rectangular insertion port 28 is formed in front of the connector 25 on the front surface of the mounting portion 22. The connector 25 has an upper connection position where the shutter portion 26 is retracted above the insertion port 28 and the opening is positioned directly behind the insertion port 28, and the shutter 26 is positioned directly behind the insertion port 28. Can be rotated to a non-connection position where it is retracted below the insertion port 28. However, the connector 25 is urged by a torsion spring (not shown) to a non-connection position where the shutter portion 26 closes the insertion port 28 when the water injection device 30 is not mounted. In this non-connected position, the pressing piece 27 is pressed by the connector 25 retracted downward, and penetrates the mounting portion 22 and protrudes into the guide groove 24.

The water injection device 30 has a side-view L-shaped casing 31 formed by assembling left and right halved casings, and a fitting recess 32 that fits the mounting portion 22 of the hammer drill 1 is formed in the upper right portion. . In the fitting recess 32, three plate-shaped male terminals 33, 33,... For power supply and communication are juxtaposed at predetermined intervals in the left-right direction and project rearward on the upper rear surface of the casing 31. ing.
Further, on the upper surface of the rear portion of the casing 31, a pressing rail 34 that fits into the guide groove 24 of the mounting portion 22 is provided so as to protrude in the front-rear direction. At the rear end of the pressing rail 34, an inclined surface whose height decreases as it goes rearward is formed. A pair of guide rails 35 and 35 are erected on the left and right sides of the pressing rail 34 in the front-rear direction at intervals at which the lower portion of the mounting portion 22 can be fitted. Projections 36 that can be fitted in coupling grooves (not shown) provided in the projection are provided inwardly.

  On the other hand, a guide tube 37 is provided at the upper part of the casing 31 in the front-rear direction so that the front end is opened and the rear end is turned in a U-shape so as to go to the rear of the casing 31. It is held so that it can slide back and forth. An L-shaped nozzle 39 is held at the front end of the slide tube 38, and a tip having a ring-shaped water inlet 40 is projected upward. In a state where the water injection device 30 is mounted on the hammer drill 1, the bit 10 can penetrate the water injection port 40. A flexible hose 41 whose front end is connected to the nozzle 39 is accommodated inside the guide tube 37 and the slide tube 38, and the rear end of the flexible hose 41 follows the shape of the rear end of the guide tube 37. A cylindrical duct 42 folded in a U shape is connected. The leading end of the duct 42 protrudes into the casing 31.

  A water storage tank 43 is accommodated in the lower part of the casing 31 and is connected to the tip of the duct 42 by a pipe 44. The pipe 44 is provided with a motor-driven pump 45 on the water storage tank 43 side and a valve 46 for opening and closing the pipe 44 on the duct 42 side, and is electrically connected to a water injection controller 47 provided in the casing 31. It is connected. The water injection controller 47 is electrically connected to the male terminal 33, and the male terminal 33 is connected to the connector 25 of the hammer drill 1, so that the pump 45 and the valve 46 are operated by receiving power supply from the controller 23. It is supposed to let you. Reference numeral 48 denotes a lid that opens and closes the front portion of the casing 31. By opening the lid 48, the storage tank 43 and the like can be taken in and out and maintained. Reference numeral 49 denotes a water supply port provided in the water storage tank 43, which can supply water to the taken out water storage tank 43 and can be connected to a hose from the outside.

In the hammer drill 1 configured as described above, when the water injection device 30 is mounted, the guide rails 35 and 35 of the casing 31 are aligned with the lower portion of the mounting portion 22 of the hammer drill 1 so that the mounting portion 22 is attached to the casing 31. In a state of being positioned on the rear portion, the water injection device 30 is slid rearward so that the fitting recess 32 is fitted to the mounting portion 22 from the front. Then, the pressing rail 34 of the water injection device 30 is fitted in the guide groove 24 of the mounting portion 22, and the protrusion 36 of the guide rail 35 is fitted in the coupling groove, and slides backward. At this time, the pressing rail 34 is in contact with the pressing piece 27. However, since the pressing piece 27 is pushed upward by the inclined surface, the connector 25 has the shutter 26 retracted upward and the opening is located immediately behind the insertion port 28. Move to the connection position.
Thereafter, the male terminal 33 of the water injection device 30 enters the housing 2 through the opened opening 28, and the mounting portion 22 is fitted into the fitting recess 32 and simultaneously inserted into the female terminal to be electrically connected (see FIG. 1). At the same time, power is supplied to the water injection controller 47 of the water injection device 30.

  Then, when the slide pipe 38 is extended forward and the water inlet 40 is positioned in front of the bit 10, the switch 3 of the hammer drill 1 is pushed in to turn on the switch 19, and the motor 3 is driven. The intermediate shaft 6 is rotated. At this time, the clutch 8 is slid from the outside of the housing 2 to engage with the first gear 7 only, the retracted position with only the boss sleeve 9, and the first gear 7 and the boss sleeve 9 simultaneously. By selecting one of the intermediate positions to be combined, a drill mode in which the tool holder 11 rotates through the second gear 17 to rotate the bit 10, and the piston cylinder 12 is reciprocated by swinging the arm 13 to interlock. The hammer mode that strikes the bit 10 via the impact bolt 16 by the striker 15 and the hammer drill mode that simultaneously rotates the tool holder 11 and strikes the impact bolt 16 can be selected. Therefore, if the water injection port 40 is brought into contact with the work surface and the hammer drill 1 is advanced, the slide tube 38 is moved backward relatively, and the bit 10 can penetrate the water injection port 40 to perform operations such as drilling. .

On the other hand, when the switch 19 is turned ON, the controller 23 transmits an operation start signal to the water injection controller 47 of the water injection device 30. Therefore, the water injection controller 47 operates the pump 45 and opens the valve 46. As a result, the water in the water storage tank 43 is sent to the duct 42 and the flexible hose 41 through the pipe 44, injected into the periphery of the bit 10 from the water injection port 40 of the nozzle 39, and the bit 10 is cooled. Even if the drilling advances and the hammer drill 1 moves forward, the slide tube 38 is relatively retracted and the water inlet 40 is always in contact with the work surface, so that the bit 10 is always cooled.
When the push of the switch lever 20 is released and the switch 19 is turned OFF after the work is finished, the motor 3 stops and the rotation of the bit 10 stops. At the same time, the controller 23 transmits an operation stop signal to the water injection controller 47 of the water injection device 30, so that the water injection controller 47 stops the pump 45 and closes the valve 46, so that the water injection to the water injection port 40 is also stopped.

  In order to remove the water injection device 30, when the water injection device 30 is slid forward from the hammer drill 1, the water injection device 30 is moved forward by the guidance of the pressing rail 34 by the guide groove 24 and the guide of the ridge 36 by the coupling groove. In accordance with this, the male terminal 33 is separated from the connector 25 and extracted from the insertion port 28. Thereafter, the connector 25, which has been released from the pushing-up of the pressing piece 27 by the advanced pressing rail 34, returns to the non-connection position by the urging of the torsion spring, so that the shutter portion 26 closes the insertion port 28 again.

As described above, according to the water injection device 30 and the hammer drill 1 of the above embodiment, the water in the water storage tank 43 can be supplied to the water injection port 40 by the pump 45, so that the water storage amount of the water storage tank 43 is always reduced. Water can be injected in an appropriate amount, making it easy to use.
In particular, here, since the power of the pump 45 is supplied from the hammer drill 1 when the water injection device 30 is attached to the hammer drill 1, a dedicated power source is not required for the water injection device 30, leading to weight reduction and cost reduction.

In addition, since the pump 45 operates in conjunction with the operation of the hammer drill 1, water is poured into the bit 10 automatically when the hammer drill 1 is used without the operator's attention, and reliable cooling is performed. Is possible.
Further, since the water injection port 40 can be moved back and forth by the slide tube 38, the water injection port 40 can be maintained at the contact position with the work surface even if the drilling proceeds. Therefore, the bit 10 can always be cooled.
In addition, since the water injection port 40 has a ring shape through which the bit 10 can penetrate, water can be uniformly injected from the periphery of the bit 10 and the cooling effect is enhanced.
And since the hose can be connected from the outside to the water supply port 49 of the water storage tank 43, water can be easily replenished without taking out the water storage tank 43 one by one, and it can be used with the hose connected. In this case, the lid 48 and a part of the casing 31 may be eliminated so that the water supply port 49 is always exposed.

In the above embodiment, the valve 46 is provided in the pipe 44 on the downstream side of the pump 45, but the valve 46 may be omitted. The water supply port 49 of the water storage tank 43 can also be omitted.
Moreover, in the said form, although the power supply of the pump 45 and the water injection controller 47 is obtained from the hammer drill 1, the battery 50 is provided in the casing 31 so that attachment or detachment is possible like the water injection apparatus 30A shown in FIG. Independent power supply. In this way, the power consumption of the hammer drill 1 is reduced, and the charging frequency of the battery pack 21 is reduced.

  Furthermore, the pump 45 is not necessarily linked to the operation of the hammer drill 1. Like the water injection device 30 </ b> B shown in FIG. 4, a switch 51 for operating the pump 45 is provided in the casing 31 to electrically supply the water injection controller 47. It is also possible to connect and operate the pump 45 independently of the hammer drill 1 by ON / OFF operation of the switch 51. In this way, for example, after the operation of the hammer drill 1 is stopped, it is possible to use the water injection device 30B alone for cooling and cleaning the bit 10, and the usability is improved. However, even if the operation is independent, it is possible to obtain power from the hammer drill 1 as shown in FIG.

On the other hand, as an interlocking mode of the pump 45, for example, a predetermined retreat position of the slide tube 38 is detected by a sensor 52 such as a limit switch or a proximity sensor as in a water injection device 30C shown in FIG. Then, the pump 45 may be operated. If operated in conjunction with the backward movement of the water injection port 40 in this way, the water injection device 30C is not operated by the operation of the hammer drill 1 before work, and wasteful power and water are not consumed, and water injection is performed at a necessary timing. It can be performed. In this case also, it is possible to obtain the power source from the hammer drill 1 as shown in FIG.
Further, in each of the above examples, the casing 31 may be provided with a changeover switch capable of switching the output of the pump 45 in a plurality of steps or in a stepless manner. Providing such a switching operation unit makes it possible to select an appropriate amount of water injection according to the type of bit and work.
Then, in conjunction with the operation of the pump and the power tool, the pump operation switch ON may be a precondition, the water inlet retreat may be a precondition, or both may be a precondition. In addition, even if a switch for operating the pump is provided, it may be assumed that the operation of the power tool is not performed immediately without operating the pump, the retraction of the water inlet is a precondition, or both are preconditions. Good. That is, any of the inventions according to claims 4 to 6 can be combined under AND conditions.

  In addition to the change in the arrangement of the motor and battery pack, the hammer drill also has a connector that can be slid between the connection position and the non-connection position in the vertical or horizontal direction instead of rotating, such as a coil spring or a leaf spring. The urging means can be urged to the non-connection position. As for the power supply to the water injection device, the relationship between the male terminal and the female terminal is reversed, or instead of inserting the terminal, a terminal part that contacts each other is provided at the coupling part of the mounting part and the fitting recess, etc. It can be changed. Of course, the present invention is applicable not only to hammer drills but also to other power tools (including AC tools) such as a power drill as long as a water injection device can be attached.

  1 .. Hammer drill, 2 .. Housing, 3 .. Motor, 4 .. Output shaft, 6 .. Intermediate shaft, 10 .. Bit, 11 .. Tool holder, 21. , 23 .. Controller, 25 .. Connector, 30, 30A-30C .. Water injection device, 31. Casing, 32. Fitting recess, 33. Male terminal, 37. Guide tube, 38. Slide tube 39 .... Nozzle, 40 ... Water injection port, 41 ... Flexible hose, 42 ... Duct, 43 ... Water tank, 44 ... Piping, 45 ... Pump, 46 ... Valve, 47 ... Water injection controller, 48..Cover body, 49..Water supply port, 50..Battery, 51..Switch, 52..Sensor.

Claims (11)

A water injection device for an electric tool formed by protruding a water injection port to a tip tool of the electric tool on a casing that can be attached to the electric tool,
A water injection device for an electric tool, wherein a water storage tank for storing a cooling medium and a pump are mounted, and the cooling medium of the water storage tank can be supplied to the water injection port by the pump.   The water injection device for an electric tool according to claim 1, wherein power of the pump is supplied from the electric tool in a mounted state on the electric tool.   The water supply device for an electric tool according to claim 1, wherein a power source of the pump is provided independently of the electric tool.   The water injection device for an electric tool according to any one of claims 1 to 3, wherein the pump operates in conjunction with the operation of the electric tool.   The water injection device for an electric tool according to any one of claims 1 to 3, further comprising a switch for operating the pump.   The said water injection port is movable back and forth in the protrusion direction of the said tip tool, The said pump operate | moves in response to retreating of the said water injection port, The one in any one of Claim 1 thru | or 3 Water injection device for electric tools.   The water injection device for an electric tool according to any one of claims 1 to 5, wherein the water injection port is movable back and forth in a protruding direction of the tip tool.   The water injection device for an electric tool according to any one of claims 1 to 7, wherein the water injection port has a ring shape through which the tip tool can penetrate.   The water injection device for an electric tool according to any one of claims 1 to 8, wherein a hose for supplying a cooling medium to the water storage tank is connectable.   The water injection device for an electric tool according to any one of claims 1 to 9, further comprising a switching operation unit capable of switching the output of the pump.   The electric tool formed by mounting the water injection device for an electric tool according to any one of claims 1 to 10.

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