EP2130651B1 - Impact tool - Google Patents
Impact tool Download PDFInfo
- Publication number
- EP2130651B1 EP2130651B1 EP08711844.4A EP08711844A EP2130651B1 EP 2130651 B1 EP2130651 B1 EP 2130651B1 EP 08711844 A EP08711844 A EP 08711844A EP 2130651 B1 EP2130651 B1 EP 2130651B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- gear
- output shaft
- reduction shaft
- impact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000005553 drilling Methods 0.000 description 4
- 230000005641 tunneling Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D16/006—Mode changers; Mechanisms connected thereto
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D16/003—Clutches specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/24—Damping the reaction force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/26—Lubricating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/003—Crossed drill and motor spindles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D2216/0007—Details of percussion or rotation modes
- B25D2216/0015—Tools having a percussion-only mode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D2216/0007—Details of percussion or rotation modes
- B25D2216/0023—Tools having a percussion-and-rotation mode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/165—Overload clutches, torque limiters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/185—Pressure equalising means between sealed chambers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/245—Spatial arrangement of components of the tool relative to each other
Definitions
- This invention relates to an impact tool as disclosed in the preamble of claim 1, such as an electric hammer, a hammer drill, and the like.
- Such an impact tool is known from JP 53-155501 U .
- Patent Document 1 discloses one known type such that within a housing, a tool holder having a bit-installable front end is rotatably supported, a motor is disposed with an output shaft thereof oriented in a direction perpendicular to an axis of the tool holder, and an impact mechanism is provided which comprises a piston configured to make a reciprocating motion by means of a crank mechanism actuated according to a rotation of the output shaft and an impactor configured to move in synchronization with the piston by the action of an air spring.
- a shaft (reduction shaft) provided with a torque limiter which enables transmission of a rotatory motion of the motor to the tool holder within a predetermined torque is rotatably supported in a position parallel to the output shaft between the tool holder and the motor, and a switch mechanism configured to permit selection of ON and OFF of the transmission of the rotatory motion from the output shaft is provided to this shaft.
- the piston upon activation of the motor, the piston is caused to reciprocate by means of the crank mechanism, and the impactor synchronized with the piston strikes a bit indirectly through an interjacent element such as an impact bolt.
- the rotatory motion of the motor is transmitted to the tool holder through the shaft, and thus the rotatory motion, as well, is imparted to the bit so that the tool can be used in a hammer drill mode.
- the switch mechanism is actuated to interrupt the transmission of the rotatory motion to the shaft, a striking motion only is imparted to the bit so that the tool can be used in a hammer mode.
- Patent Document 2 proposes that an air chamber connected only with the outside of the impact unit and having a volume rendered variable by a diaphragm be formed in the inner housing so that reduction in volume of the air chamber can abate the increase in pressure inside the impact unit.
- Patent Document 3 discloses an arrangement in which a casing comprising a pressure equilibrating chamber in communication with the inside of the impact unit and a pressure equilibrating tube in communication with the ambient atmosphere while blocking the oil from flowing out is mounted to a sealed impact unit so that a differential pressure between the inside and the outside of the impact unit is cancelled by using the pressure equilibrating chamber.
- the above-described conventional hammer drill has the motor, the crank mechanism and the shaft which are disposed in a rear-side space of the housing, and thus its barycenter is located off-center to a rear side thereof.
- an impact tool according to claim 1 is provided.
- the reduction shaft is disposed frontward of the intermediate reduction shaft, and the motor is positioned closer to the axis of the tool holder, so that the impact tool has its barycenter shifted frontward and upward and thus attains an improved weight balance as a whole.
- the moment to be produced in the impact tool around a front end of the bit during a drilling or other operation will become small, and vibration entailed during a striking operation thereof is reduced thereby achieving improved operability and workability.
- the motor since the motor is in a position shifted closer to the axis of the tool holder, the tool may be rendered compact in its height direction.
- the intermediate reduction shaft optionally comprises a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to the reduction shaft
- the switching operation can be performed easily at the switch mechanism as the switch mechanism is provided at the intermediate reduction shaft of which the torque applied thereto is smaller.
- the reduction shaft optionally comprises a torque limiter
- the switching operation can be performed prior to the application of impact (load) by the striking operation as the intermediate reduction shaft is located upstream of the reduction shaft, so that a good operability can be maintained.
- a hammer drill 1 comprises an outer housing 2 and components housed therein which includes a rotation and impact unit 3 disposed in an upper space thereof and a motor 8 disposed rearward of the rotation and impact unit 3 in a lower space thereof, wherein the rotation and impact unit 3 has a tool holder 7 protruding frontward (leftward in the drawing), and the motor 8 has an output shaft 9 thereof oriented upward.
- the rotation and impact unit 3 is enclosed in, and defined by, an inner housing inside the outer housing 2, wherein the inner housing comprises a holder housing 4 in which the tool holder 7 is rotatably supported, a crank housing 5 which is disposed rearward of and coupled to the holder housing 4, and a gear housing 6 which is disposed below and coupled to the crank housing 5.
- the output shaft 9 of the motor 8 is rotatably supported by ball bearings 10 held at the bottom of the gear housing 6 and is inserted in the rotation and impact unit 3.
- Denoted by reference numerals 11 and 12 are seal rings which seal a protruded portion of the tool holder 7 and an inserted portion of the output shaft 9, respectively.
- a tubular proximity portion 14 is formed which has a through hole 13 extending laterally and tunneling through the rotation and impact unit 3 and of which an underside facing to an inside of the rotation and impact unit 3 is proximate to an end face of the output shaft 9.
- a vent hole 15 coaxial with the output shaft 9 is formed so that the through hole 13 connecting to an outside of the rotation and impact unit 3 is in communication with an inside of the rotation and impact unit 3.
- a protrusion 16 having a shape of a circular cone tapering toward the end face of the output shaft 9 is provided coaxially with the vent hole 15.
- a recess 17 having a circular shape with an inverted tapered surface 18 provided at an open side thereof, contoured to fit the shape of the tapering of the protrusion 16 is provided. In this way, a labyrinth seal 19 is formed from around the output shaft 9 to the vent hole 15 in the rotation and impact unit 3.
- the tool holder 7 has a front end configured to be able to hold a bit 20 fitted and installed therein, and incorporates an impact bolt 21 as an interjacent element which is disposed rearward of the bit 20 and configured to be movable frontward and rearward in a predetermined stroke.
- Denoted by reference numeral 22 is a bevel gear coupled to a rear end of the tool holder 7.
- a cylinder 23 held by the crank housing 5 is loosely inserted from rearward; inside the cylinder 23, a striker 24 as an impactor disposed frontward and a piston 26 disposed rearward of the striker 24 with an air chamber 25 interposed therebetween are housed, in a manner that renders them movable frontward and rearward, respectively.
- the piston 26 is connected via a connecting rod 27 to an eccentric pin 29 provided protrusively on an upper surface of the crank shaft 28.
- the crank shaft 28 is disposed rearward of the output shaft 9 and rotatably supported by the crank housing 5 and the gear housing 6 in a position parallel to the output shaft 9.
- a gear 30 provided at a lower portion of the crank shaft 28 is in mesh with the output shaft 9.
- An intermediate reduction shaft 31 is disposed below the tool holder 7 and frontward of the output shaft 9, and is rotatably supported in a position parallel to the output shaft 9, whereas a reduction shaft 32 is disposed frontward of the intermediate reduction shaft 31, and rotatably supported in a position parallel to the intermediate reduction shaft 31.
- a pinion of the output shaft 9 is in mesh with the first gear 35 provided on an upper portion of the intermediate reduction shaft 31, and the motor 8 is disposed in such a position that the output shaft 9 protrudes upward beyond the third gear 37 of the reduction shaft 32.
- the motor 8 is positioned closer to the axis of the tool holder 7.
- the first gear 35 is fitted on the intermediate reduction shaft 31, rotatably relative to the intermediate reduction shaft 31, and a switch plate 39 having engageable teeth 40, 40, .. provided protrusively on an underside thereof and configured to be engageable with engageable recesses 38, 38, .. provided on an upper surface of the first gear 35 is provided in a position above the first gear 35 on, and coupled with splines of, the intermediate reduction shaft 31 so that the switch plate 39 is movable in an axial direction and rotatable integrally with the intermediate reduction shaft 31.
- the switch plate 39 is biased by a coil spring 41 toward a position in which the switch plate 39 engages with the first gear 35, and can be operated by manipulation of a switch member (not shown) provided at the outer housing 2 to slide to a position (right-hand position in FIG. 1 ) in which the switch plate 39 engages with the first gear 35 and to a position (left-hand position in FIG. 1 ) in which the switch plate 39 disengages from the first gear 35.
- a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to the reduction shaft 32 is implemented.
- the reduction shaft 32 of which an upper end portion and a lower end portion are rotatably supported by ball bearings 42 held in the crank housing 3 and by ball bearings 43 held in the gear housing 6, respectively, and on which a bevel gear 44 is provided at an upper end thereof and meshed with the bevel gear 22 of the tool holder 7.
- the third gear 37 is fitted on, and configured to be rotatable independently from, the reduction shaft 32, and divided into an upper plate 45 meshed with the second gear 36 of the intermediate reduction shaft 31 and a lower plate 46 configured to rotate integrally with the reduction shaft 32.
- An engageable member 48 configured to be biased toward a radial direction of protrusion thereof by a coil spring 47 is provided on the lower plate 46, and engages with an engageable portion 49 provided on an inner side surface of the upper plate 45.
- a torque limiter is configured to transmit a rotatory motion of the second gear 36 to the reduction shaft 32 when the torque is not greater than such a magnitude that the engageable member 48 can be kept in engagement with the engageable portion 49 by the pressing force of the coil spring 47, and to cause the engageable member 48 to move away from the engageable portion 49 against the pressing force of the coil spring 47 to cause the upper plate 45 alone to rotate at idle, thereby interrupting transmission of torque from the second gear 36 toward the reduction shaft 32, when a torque exceeding the magnitude as mentioned above is produced at a tool holder 7 side.
- the hammer drill 1 configured as described above, with a bit 20 installed and held in the tool holder 7, when a switch lever (not shown) provided at the outer housing 2 is manipulated to activate the motor 8, the rotatory motion of the output shaft 9 is transmitted to the crank shaft 28, and the rotatory motion of the crank shaft 28 is converted to the reciprocating motion of the piston 26 actuated via the connecting rod 27.
- the striker 24 is moved via the air chamber 25 in synchronization with the reciprocating motion of the piston 26, and strikes the rear end of the impact bolt 21 that has been pushed by the rear end of the bit 20 and protruded into the cylinder 23. In this way, the striking motion by the striker 24 is imparted indirectly to the bit 20.
- the rotatory motion of the output shaft 9 is, first, transmitted to the first gear 35.
- the switch plate 39 has been operated to switch to the position in which it engages with the first gear 35, then the first gear 35 and the intermediate reduction shaft 31 integrally rotate together, and thus the rotatory motion of the intermediate reduction shaft 31 is transmitted from the second gear 36 through the third gear 37 to the reduction shaft 32.
- the tool holder 7 to which the rotatory motion is transmitted from the bevel gear 44 of the reduction shaft 32 rotates, so that the bit 20 operates in a hammer drill mode in which a rotatory motion as well as a striking motion is made.
- the switch plate 39 has been operated to the position in which it disengages from the first gear 35, then the rotatory motion of the first gear 35 is not transmitted to the intermediate reduction shaft 31. Accordingly, the tool holder 7 fails to make a rotatory motion, so that the bit 20 operates in the hammer mode in which the striking motion only is imparted thereto.
- the reduction shaft 32 is located in a position shifted significantly frontward in comparison with the position of a reduction shaft in a tool designed under the conventional scheme.
- the output shaft 9 can be configured to mesh with the first gear 35 located on an upper portion of the intermediate reduction shaft 31, unlike a conventional arrangement in which the output shaft is configured to mesh with the third gear 37 located on a lower portion of the reduction gear 32, and thus the position of the motor 8 is shifted upward closer to the axis of the tool holder 7.
- the intermediate reduction shaft 31 configured to reduce the rotation speed of the output shaft 9 and transmit the speed-reduced rotatory motion to the reduction shaft 32 is disposed in a position parallel to the output shaft 9, frontward of the output shaft 9 between the reduction shaft 32 and the output shaft 9, so that the reduction shaft 32 is disposed frontward of the intermediate reduction shaft 31, while the motor 8 is disposed in a position such that the output shaft 9 protrudes upward beyond the third gear 37 of the reduction shaft 32 so that the motor 8 is positioned closer to the axis of the tool holder 7. Therefore, the hammer drill 1 has its barycenter shifted frontward and upward and thus attains an improved weight balance as a whole.
- the moment to be produced in the hammer drill 1 around the front end of the bit 20 during the drilling or other operation will become small, and vibration entailed during the striking operation is reduced whereby improved operability and workability can be achieved. Furthermore, since the motor 8 is in a position shifted closer to the axis of the tool holder 7, the hammer drill 1 may be rendered compact in its height direction.
- the intermediate reduction shaft 31 includes a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to the reduction shaft 32, the switching operation can be performed easily at the switch mechanism in that the switch mechanism is provided at the intermediate reduction shaft 31 of which the torque applied thereto is smaller.
- the intermediate reduction shaft 31 is located upstream of the reduction shaft 32 that includes the torque limiter, and thus, the switching operation can be performed prior to the application of impact (load) by the striking operation, so that a good operability can be maintained.
- the proximity portion 14 having an inner surface proximate to an end face of the output shaft 9 provided in the rotation and impact unit 3 is formed in the crank housing 5, and the vent hole 15 affording communication between the inside of the rotation and impact unit 3 and the outside of the rotation and impact unit 3 is formed in a surface of the proximity portion 14 opposed to the end face of the output shaft 9.
- air inside the rotation and impact unit 3 can be released reliably without causing oil leakage through the vent hole 15, and therefore adequate lubrication can be maintained.
- separation of air and oil is achieved by means of the output shaft 9, which provides a reasonable design utilizing the existing configurations; therefore, a fabrication step for providing means for releasing air can be minimized so that increase in cost and required space can be minimized, too.
- the rotation shaft is the output shaft 9 of the motor 8
- the output shaft 9 that rotates at the highest speeds can be utilized to more effectively prevent the oil leakage.
- the protrusion 16 located coaxially with the vent hole 15 is formed at the surface of the proximity portion in which the vent hole 15 is formed, and the recess 17 in which the protrusion 16 is inserted in a noncontact manner is formed at the end face of the output shaft 9, and thus the labyrinth seal 19 formed with the protrusion 16 and the recess 17 may serve to more effectively prevent the oil leakage.
- the switch mechanism comprising a switch plate and other components is used, but the switch mechanism is not limited to this configuration.
- a slide key configured to engage with and disengage from the first gear may be provided in the intermediate reduction shaft, or the first gear may be slid in the axial direction to engage with and disengage from spline teeth or keys at the side of the intermediate reduction shaft; likewise, the specific configurations may be modified where appropriate.
- the switch mechanism may alternatively be provided in the reduction shaft, and the switch mechanism may be omitted.
- the torque limiter is provided in the reduction shaft in the above-described embodiment, but the configurations of the torque limiter may be designed differently where appropriate, and the torque limiter may be omitted.
- the types of bearings for each reduction shaft, configurations of the gears, etc. may be changed where appropriate.
- the arrangement of the intermediate reduction shaft, the reduction shaft and the output shaft may not be limited to such that they are aligned in a straight line extending in the front-rear direction.
- the tubular proximity portion having a through hole tunneling through the rotation and impact unit is formed, but the configuration thereof is not limited to this tunneling configuration, and may be a hole which has a bottom and extends to the end face of the rotation shaft such as the output shaft.
- the recess may be formed, other than by the receding of a surface, by providing an annular ridge rising from a surface to make a space in which the protrusion can loosely be inserted.
- the labyrinth seal may be formed by providing two such annular ridges which are coaxially provided in a manner that permits them to be loosely fitted together. Rather, it is to be understood that the oil leakage can be prevented without the protrusion and the recess by simply arranging the end face of the rotation shaft in a position close to the vent hole.
- the output shaft is adopted as the rotation shaft, but the present invention may be applied to an end face of any other rotation shaft such as the intermediate reduction shaft, the reduction shaft and the crank shaft, as long as the proximity portion and the vent hole can be formed. Accordingly, the proximity portion may be formed in any housing other than the crank housing provided that it is an inner housing defining the impact unit.
- the present invention may be applicable not only to a hammer drill but also to a hammer in which a striking motion only is imparted to the bit by the crank mechanism.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
Description
- This invention relates to an impact tool as disclosed in the preamble of claim 1, such as an electric hammer, a hammer drill, and the like.
- Such an impact tool is known from
JP 53-155501 U - To give an example of a hammer drill, Patent Document 1 discloses one known type such that within a housing, a tool holder having a bit-installable front end is rotatably supported, a motor is disposed with an output shaft thereof oriented in a direction perpendicular to an axis of the tool holder, and an impact mechanism is provided which comprises a piston configured to make a reciprocating motion by means of a crank mechanism actuated according to a rotation of the output shaft and an impactor configured to move in synchronization with the piston by the action of an air spring. In this hammer drill, a shaft (reduction shaft) provided with a torque limiter which enables transmission of a rotatory motion of the motor to the tool holder within a predetermined torque is rotatably supported in a position parallel to the output shaft between the tool holder and the motor, and a switch mechanism configured to permit selection of ON and OFF of the transmission of the rotatory motion from the output shaft is provided to this shaft.
- With this configuration, upon activation of the motor, the piston is caused to reciprocate by means of the crank mechanism, and the impactor synchronized with the piston strikes a bit indirectly through an interjacent element such as an impact bolt. On the other hand, the rotatory motion of the motor is transmitted to the tool holder through the shaft, and thus the rotatory motion, as well, is imparted to the bit so that the tool can be used in a hammer drill mode. When the switch mechanism is actuated to interrupt the transmission of the rotatory motion to the shaft, a striking motion only is imparted to the bit so that the tool can be used in a hammer mode.
- It is often the case with this type of the impact tool that the output shaft and the impact mechanism are enclosed with an inner housing comprised of a gear housing or the like disposed inside the housing to form an impact unit which is sealed and filled with oil in order to ensure that the impactor can be moved smoothly. However, the pressure rise caused by the temperature rise inside the sealed impact unit in conjunction with the striking motion, would disadvantageously cripple an expected normal set operation of the air spring between the piston and the impactor, with the result that the impactor could not make an adequate striking operation and/or leakage of oil along with air from a sealed portion thereof might occur.
- With this in view,
Patent Document 2 proposes that an air chamber connected only with the outside of the impact unit and having a volume rendered variable by a diaphragm be formed in the inner housing so that reduction in volume of the air chamber can abate the increase in pressure inside the impact unit.Patent Document 3 discloses an arrangement in which a casing comprising a pressure equilibrating chamber in communication with the inside of the impact unit and a pressure equilibrating tube in communication with the ambient atmosphere while blocking the oil from flowing out is mounted to a sealed impact unit so that a differential pressure between the inside and the outside of the impact unit is cancelled by using the pressure equilibrating chamber. - Patent Document 1:
JP 9-57511 A - Patent Document 2:
JP 2004-351595 A - The above-described conventional hammer drill has the motor, the crank mechanism and the shaft which are disposed in a rear-side space of the housing, and thus its barycenter is located off-center to a rear side thereof. As a result, the moment produced in the hammer drill around the center of the front end of the bit when a drilling or other operation is carried out becomes so great that vibration entailed during the striking operation increases, thus, making an operator uncomfortable, impairing easy operability and workability as the case may be.
- On the other hand, in the arrangement as disclosed in
Patent Document - Therefore, it is an object of the present invention to provide an impact tool in which the vibration entailed during the striking operation can be reduced to improve operability and workability, while air inside the impact unit can be released easily and reliably without causing oil leakage.
- In order to achieve the above object, an impact tool according to claim 1 is provided.
- According to the invention as set forth in claim 1, the reduction shaft is disposed frontward of the intermediate reduction shaft, and the motor is positioned closer to the axis of the tool holder, so that the impact tool has its barycenter shifted frontward and upward and thus attains an improved weight balance as a whole. As a result, the moment to be produced in the impact tool around a front end of the bit during a drilling or other operation will become small, and vibration entailed during a striking operation thereof is reduced thereby achieving improved operability and workability. Moreover, since the motor is in a position shifted closer to the axis of the tool holder, the tool may be rendered compact in its height direction.
- Furthermore, if the intermediate reduction shaft optionally comprises a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to the reduction shaft, then the switching operation can be performed easily at the switch mechanism as the switch mechanism is provided at the intermediate reduction shaft of which the torque applied thereto is smaller. In particular, if the reduction shaft optionally comprises a torque limiter, the switching operation can be performed prior to the application of impact (load) by the striking operation as the intermediate reduction shaft is located upstream of the reduction shaft, so that a good operability can be maintained.
- Embodiments of the present invention will be described hereinafter with reference to the accompanying drawings.
- In
FIG. 1 , which shows a partial vertical section of a hammer drill as one example of an impact tool, a hammer drill 1 comprises anouter housing 2 and components housed therein which includes a rotation andimpact unit 3 disposed in an upper space thereof and amotor 8 disposed rearward of the rotation andimpact unit 3 in a lower space thereof, wherein the rotation andimpact unit 3 has atool holder 7 protruding frontward (leftward in the drawing), and themotor 8 has anoutput shaft 9 thereof oriented upward. The rotation andimpact unit 3 is enclosed in, and defined by, an inner housing inside theouter housing 2, wherein the inner housing comprises aholder housing 4 in which thetool holder 7 is rotatably supported, acrank housing 5 which is disposed rearward of and coupled to theholder housing 4, and agear housing 6 which is disposed below and coupled to thecrank housing 5. Theoutput shaft 9 of themotor 8 is rotatably supported byball bearings 10 held at the bottom of thegear housing 6 and is inserted in the rotation andimpact unit 3. Denoted byreference numerals tool holder 7 and an inserted portion of theoutput shaft 9, respectively. - In a portion of the crank housing 5 right above the
output shaft 9, as shown also inFIG. 2 , atubular proximity portion 14 is formed which has a throughhole 13 extending laterally and tunneling through the rotation andimpact unit 3 and of which an underside facing to an inside of the rotation andimpact unit 3 is proximate to an end face of theoutput shaft 9. In a surface of theproximity portion 14 opposed to the end face of theoutput shaft 9, avent hole 15 coaxial with theoutput shaft 9 is formed so that the throughhole 13 connecting to an outside of the rotation andimpact unit 3 is in communication with an inside of the rotation andimpact unit 3. At a portion of theproximity portion 14 in which thevent hole 15 is formed, aprotrusion 16 having a shape of a circular cone tapering toward the end face of theoutput shaft 9 is provided coaxially with thevent hole 15. At the end face of theoutput shaft 9, arecess 17 having a circular shape with an invertedtapered surface 18 provided at an open side thereof, contoured to fit the shape of the tapering of theprotrusion 16 is provided. In this way, alabyrinth seal 19 is formed from around theoutput shaft 9 to thevent hole 15 in the rotation andimpact unit 3. - On the other hand, the
tool holder 7 has a front end configured to be able to hold abit 20 fitted and installed therein, and incorporates animpact bolt 21 as an interjacent element which is disposed rearward of thebit 20 and configured to be movable frontward and rearward in a predetermined stroke. Denoted byreference numeral 22 is a bevel gear coupled to a rear end of thetool holder 7. - In the
tool holder 7, acylinder 23 held by thecrank housing 5 is loosely inserted from rearward; inside thecylinder 23, astriker 24 as an impactor disposed frontward and apiston 26 disposed rearward of thestriker 24 with anair chamber 25 interposed therebetween are housed, in a manner that renders them movable frontward and rearward, respectively. Thepiston 26 is connected via a connectingrod 27 to aneccentric pin 29 provided protrusively on an upper surface of thecrank shaft 28. Thecrank shaft 28 is disposed rearward of theoutput shaft 9 and rotatably supported by thecrank housing 5 and thegear housing 6 in a position parallel to theoutput shaft 9. Agear 30 provided at a lower portion of thecrank shaft 28 is in mesh with theoutput shaft 9. In this way, a crank mechanism comprised of the connectingrod 27 and thecrank shaft 28 can convert a rotatory motion of theoutput shaft 9 to a reciprocating motion of thepiston 26. - An
intermediate reduction shaft 31 is disposed below thetool holder 7 and frontward of theoutput shaft 9, and is rotatably supported in a position parallel to theoutput shaft 9, whereas areduction shaft 32 is disposed frontward of theintermediate reduction shaft 31, and rotatably supported in a position parallel to theintermediate reduction shaft 31. At the outset, our discussion focuses on theintermediate reduction shaft 31, of which an upper end portion and a lower end portion are rotatably supported byball bearings 33 held in thecrank housing 5 and byneedle bearings 34 held in thegear housing 6, respectively, and on which afirst gear 35 is provided above and asecond gear 36 is provided below so that thefirst gear 35 is in mesh with theoutput shaft 9 and thesecond gear 36 is in mesh with athird gear 37 which serves as a driven gear of thereduction shaft 32. - As described above, in this embodiment, a pinion of the
output shaft 9 is in mesh with thefirst gear 35 provided on an upper portion of theintermediate reduction shaft 31, and themotor 8 is disposed in such a position that theoutput shaft 9 protrudes upward beyond thethird gear 37 of thereduction shaft 32. In other words, themotor 8 is positioned closer to the axis of thetool holder 7. - It is however to be noted that the
first gear 35 is fitted on theintermediate reduction shaft 31, rotatably relative to theintermediate reduction shaft 31, and aswitch plate 39 havingengageable teeth engageable recesses first gear 35 is provided in a position above thefirst gear 35 on, and coupled with splines of, theintermediate reduction shaft 31 so that theswitch plate 39 is movable in an axial direction and rotatable integrally with theintermediate reduction shaft 31. Theswitch plate 39 is biased by acoil spring 41 toward a position in which theswitch plate 39 engages with thefirst gear 35, and can be operated by manipulation of a switch member (not shown) provided at theouter housing 2 to slide to a position (right-hand position inFIG. 1 ) in which theswitch plate 39 engages with thefirst gear 35 and to a position (left-hand position inFIG. 1 ) in which theswitch plate 39 disengages from thefirst gear 35. In this way, a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to thereduction shaft 32 is implemented. - Next, our discussion is directed to the
reduction shaft 32, of which an upper end portion and a lower end portion are rotatably supported byball bearings 42 held in thecrank housing 3 and byball bearings 43 held in thegear housing 6, respectively, and on which abevel gear 44 is provided at an upper end thereof and meshed with thebevel gear 22 of thetool holder 7. Thethird gear 37 is fitted on, and configured to be rotatable independently from, thereduction shaft 32, and divided into anupper plate 45 meshed with thesecond gear 36 of theintermediate reduction shaft 31 and alower plate 46 configured to rotate integrally with thereduction shaft 32. Anengageable member 48 configured to be biased toward a radial direction of protrusion thereof by acoil spring 47 is provided on thelower plate 46, and engages with anengageable portion 49 provided on an inner side surface of theupper plate 45. In this way, a torque limiter is configured to transmit a rotatory motion of thesecond gear 36 to thereduction shaft 32 when the torque is not greater than such a magnitude that theengageable member 48 can be kept in engagement with theengageable portion 49 by the pressing force of thecoil spring 47, and to cause theengageable member 48 to move away from theengageable portion 49 against the pressing force of thecoil spring 47 to cause theupper plate 45 alone to rotate at idle, thereby interrupting transmission of torque from thesecond gear 36 toward thereduction shaft 32, when a torque exceeding the magnitude as mentioned above is produced at atool holder 7 side. - In the hammer drill 1 configured as described above, with a
bit 20 installed and held in thetool holder 7, when a switch lever (not shown) provided at theouter housing 2 is manipulated to activate themotor 8, the rotatory motion of theoutput shaft 9 is transmitted to thecrank shaft 28, and the rotatory motion of thecrank shaft 28 is converted to the reciprocating motion of thepiston 26 actuated via theconnecting rod 27. Thestriker 24 is moved via theair chamber 25 in synchronization with the reciprocating motion of thepiston 26, and strikes the rear end of theimpact bolt 21 that has been pushed by the rear end of thebit 20 and protruded into thecylinder 23. In this way, the striking motion by thestriker 24 is imparted indirectly to thebit 20. - On the other hand, at the side of the
intermediate reduction shaft 31, the rotatory motion of theoutput shaft 9 is, first, transmitted to thefirst gear 35. Hereupon, if theswitch plate 39 has been operated to switch to the position in which it engages with thefirst gear 35, then thefirst gear 35 and theintermediate reduction shaft 31 integrally rotate together, and thus the rotatory motion of theintermediate reduction shaft 31 is transmitted from thesecond gear 36 through thethird gear 37 to thereduction shaft 32. Accordingly, thetool holder 7 to which the rotatory motion is transmitted from thebevel gear 44 of thereduction shaft 32 rotates, so that thebit 20 operates in a hammer drill mode in which a rotatory motion as well as a striking motion is made. Contrariwise, if theswitch plate 39 has been operated to the position in which it disengages from thefirst gear 35, then the rotatory motion of thefirst gear 35 is not transmitted to theintermediate reduction shaft 31. Accordingly, thetool holder 7 fails to make a rotatory motion, so that thebit 20 operates in the hammer mode in which the striking motion only is imparted thereto. - It is to be noted that with a configuration of the
intermediate reduction shaft 31 being interposed between thereduction shaft 32 and theoutput shaft 9, thereduction shaft 32 is located in a position shifted significantly frontward in comparison with the position of a reduction shaft in a tool designed under the conventional scheme. Moreover, theoutput shaft 9 can be configured to mesh with thefirst gear 35 located on an upper portion of theintermediate reduction shaft 31, unlike a conventional arrangement in which the output shaft is configured to mesh with thethird gear 37 located on a lower portion of thereduction gear 32, and thus the position of themotor 8 is shifted upward closer to the axis of thetool holder 7. In this way, the position of thereduction shaft 32 that is provided with thebevel gear 44 and the torque limiter and is thus of a relatively heavy weight is shifted, and themotor 8 comes closer to the axis of thetool holder 7; therefore, the barycenter of the hammer drill 1 is shifted frontward, so that the weight balance of the tool including themotor 8 may be improved. Accordingly, the moment to be produced around the tip end of thebit 20 is reduced, and the vibration which would occur during the drilling or other operation may adequately be reduced. - Even if heat produced by the striking operation in the impact mechanism including the
tool holder 7 raises the temperature of air hermetically sealed in the rotation andimpact unit 3, the pressure rise in the rotation andimpact unit 3 is prevented because the inside of the rotation andimpact unit 3 is in communication with the throughhole 13 that is the outside of the rotation andimpact unit 3, via thevent hole 15 which opens near the end face of theoutput shaft 9 so that air is released through thevent hole 15. Meanwhile, around the opening of thevent hole 15 facing to the inside of the rotation andimpact unit 3, theoutput shaft 9 is rapidly rotating, and oil filled in the rotation andimpact unit 3 is blocked from entering thevent hole 15 through thelabyrinth seal 19, so that only the air separated from oil is securely released out through thevent hole 15. Consequently, adequate lubrication with oil can be maintained. - Thus, according to the hammer drill 1 configured as described above, the
intermediate reduction shaft 31 configured to reduce the rotation speed of theoutput shaft 9 and transmit the speed-reduced rotatory motion to thereduction shaft 32 is disposed in a position parallel to theoutput shaft 9, frontward of theoutput shaft 9 between thereduction shaft 32 and theoutput shaft 9, so that thereduction shaft 32 is disposed frontward of theintermediate reduction shaft 31, while themotor 8 is disposed in a position such that theoutput shaft 9 protrudes upward beyond thethird gear 37 of thereduction shaft 32 so that themotor 8 is positioned closer to the axis of thetool holder 7. Therefore, the hammer drill 1 has its barycenter shifted frontward and upward and thus attains an improved weight balance as a whole. Accordingly, the moment to be produced in the hammer drill 1 around the front end of thebit 20 during the drilling or other operation will become small, and vibration entailed during the striking operation is reduced whereby improved operability and workability can be achieved. Furthermore, since themotor 8 is in a position shifted closer to the axis of thetool holder 7, the hammer drill 1 may be rendered compact in its height direction. - Since the
intermediate reduction shaft 31 includes a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to thereduction shaft 32, the switching operation can be performed easily at the switch mechanism in that the switch mechanism is provided at theintermediate reduction shaft 31 of which the torque applied thereto is smaller. In particular, theintermediate reduction shaft 31 is located upstream of thereduction shaft 32 that includes the torque limiter, and thus, the switching operation can be performed prior to the application of impact (load) by the striking operation, so that a good operability can be maintained. - On the other hand, since the
proximity portion 14 having an inner surface proximate to an end face of theoutput shaft 9 provided in the rotation andimpact unit 3 is formed in thecrank housing 5, and thevent hole 15 affording communication between the inside of the rotation andimpact unit 3 and the outside of the rotation andimpact unit 3 is formed in a surface of theproximity portion 14 opposed to the end face of theoutput shaft 9. Thus, air inside the rotation andimpact unit 3 can be released reliably without causing oil leakage through thevent hole 15, and therefore adequate lubrication can be maintained. Moreover, separation of air and oil is achieved by means of theoutput shaft 9, which provides a reasonable design utilizing the existing configurations; therefore, a fabrication step for providing means for releasing air can be minimized so that increase in cost and required space can be minimized, too. - In particular, since the rotation shaft is the
output shaft 9 of themotor 8, theoutput shaft 9 that rotates at the highest speeds can be utilized to more effectively prevent the oil leakage. - Further in this embodiment, the
protrusion 16 located coaxially with thevent hole 15 is formed at the surface of the proximity portion in which thevent hole 15 is formed, and therecess 17 in which theprotrusion 16 is inserted in a noncontact manner is formed at the end face of theoutput shaft 9, and thus thelabyrinth seal 19 formed with theprotrusion 16 and therecess 17 may serve to more effectively prevent the oil leakage. - In the above-described embodiment, the switch mechanism comprising a switch plate and other components is used, but the switch mechanism is not limited to this configuration. A slide key configured to engage with and disengage from the first gear may be provided in the intermediate reduction shaft, or the first gear may be slid in the axial direction to engage with and disengage from spline teeth or keys at the side of the intermediate reduction shaft; likewise, the specific configurations may be modified where appropriate. The switch mechanism may alternatively be provided in the reduction shaft, and the switch mechanism may be omitted.
- Moreover, the torque limiter is provided in the reduction shaft in the above-described embodiment, but the configurations of the torque limiter may be designed differently where appropriate, and the torque limiter may be omitted.
- Besides, the types of bearings for each reduction shaft, configurations of the gears, etc. may be changed where appropriate. The arrangement of the intermediate reduction shaft, the reduction shaft and the output shaft may not be limited to such that they are aligned in a straight line extending in the front-rear direction.
- On the other hand, in the above-described embodiment, the tubular proximity portion having a through hole tunneling through the rotation and impact unit is formed, but the configuration thereof is not limited to this tunneling configuration, and may be a hole which has a bottom and extends to the end face of the rotation shaft such as the output shaft.
- Although the protrusion and the recess are formed at the surface of the proximity portion in which the vent hole is formed and at the end face of the rotation shaft, respectively, the positions at which they are formed may be interchanged. The recess may be formed, other than by the receding of a surface, by providing an annular ridge rising from a surface to make a space in which the protrusion can loosely be inserted. The labyrinth seal may be formed by providing two such annular ridges which are coaxially provided in a manner that permits them to be loosely fitted together. Rather, it is to be understood that the oil leakage can be prevented without the protrusion and the recess by simply arranging the end face of the rotation shaft in a position close to the vent hole.
- In the above-described embodiment, the output shaft is adopted as the rotation shaft, but the present invention may be applied to an end face of any other rotation shaft such as the intermediate reduction shaft, the reduction shaft and the crank shaft, as long as the proximity portion and the vent hole can be formed. Accordingly, the proximity portion may be formed in any housing other than the crank housing provided that it is an inner housing defining the impact unit. The present invention may be applicable not only to a hammer drill but also to a hammer in which a striking motion only is imparted to the bit by the crank mechanism.
-
-
FIG. 1 is a partially illustrated vertical section of a hammer drill. -
FIG. 2 is an enlarged view of an output shaft and a portion around it. - 1 -- HAMMER DRILL, 2 -- OUTER HOUSING, 3 -- ROTATION AND IMPACT UNIT, 4 -- HOLDER HOUSING, 5 -- CRANK HOUSING, 6 -- GEAR HOUSING, 7 -- TOOL HOLDER, 8 -- MOTOR, 9 -- OUTPUT SHAFT, 13 -- THROUGH HOLE, 14 -- PROXIMITY PORTION, 15 -- VENT HOLE, 16 -- PROTRUSION, 17 -- RECESS, 18 -- INVERTED TAPERED SURFACE, 19 -- LABYRINTH SEAL, 20 -- BIT, 21 -- IMPACT BOLT, 23 -- CYLINDER, 24 -- STRIKER, 25 -- AIR CHAMBER; 26 -- PISTON, 27 -- CONNECTING ROD, 28CRANK SHAFT, 31 -- INTERMEDIATE REDUCTION SHAFT, 32 -- REDUCTION SHAFT, 35 -- FIRST GEAR, 36 -- SECOND GEAR, 37 -- THIRD GEAR, 39SWITCH PLATE, 44 -- BEVEL GEAR.
Claims (11)
- An impact tool comprising:a tool holder (7) having a front end configured to hold a bit (20);a motor (8) having an output shaft (9), the motor (8) being disposed rearward of the tool holder (7) with the output shaft (9) oriented in a direction perpendicular to an axis of the tool holder (7);an impact mechanism comprising a piston (26) and an impactor (24), the piston (26) being configured to make a reciprocating motion by means of a crank mechanism actuated according to a rotation of the output shaft (9), and the impactor (24) being configured to move in synchronization with the piston (26) by an action of an air spring, wherein the crank mechanism comprises a crank shaft (28) and a gear (30) provided at a lower portion of the crank shaft (28) is in mesh with the output shaft (9);a reduction shaft (32) disposed in a position parallel to the output shaft (9) between the output shaft (9) and the tool holder (7), the reduction shaft (32) comprising a driven gear (37) and a bevel gear (44), the driven gear (37) being configured to receive a rotatory motion transmitted from the output shaft (9), and the bevel gear (44) being configured to transmit the rotatory motion to the tool holder (7); andan intermediate reduction shaft (31) disposed in a position frontward of the output shaft (9), rearward of the reduction shaft (32) and parallel to the output shaft (9), the intermediate reduction shaft (31) being configured to reduce a rotation speed of the rotatory motion transmitted from the output shaft (9) and transmit a speed-reduced rotatory motion to the reduction shaft (32),wherein the motor (8) is disposed in a position such that the output shaft (9) protrudes upward beyond the driven gear (37) of the reduction shaft (32),characterized in that the crank shaft (28) is disposed reward of the output shaft (9).
- The impact tool according to claim 1, wherein the intermediate reduction shaft (31) comprises a first gear (35) disposed in an upper position and a second gear (36) disposed in a lower position, the first gear (35) being in mesh with the output shaft (9), and the second gear (36) being in mesh with the driven gear (37).
- The impact tool according to claim 1 or 2, wherein the intermediate reduction shaft (31) comprises a switch mechanism configured to permit selection of ON and OFF of transmission of the rotatory motion to the reduction shaft (32).
- The impact tool according to claim 3, wherein the switch mechanism is comprised of the first gear (35) provided rotatably relative to the intermediate reduction shaft (31), a switch plate (39) configured to be rotatable integrally with the intermediate reduction shaft (31) and movable in an axial direction of the intermediate reduction shaft (31) thereby engage with or disengage from the first gear (35), a coil spring (41) configured to bias the switch plate (39) toward a position in which the switch plate (39) engages with the first gear (35), and a switch member configured to be externally operable to move the switch plate (39) to a position in which the switch plate (39) engages with the first gear (35) and to a position in which the switch plate (39) disengages from the first gear (35).
- The impact tool according to claim 2, wherein the reduction shaft (32) comprises a torque limiter configured to interrupt transmission of torque from the second gear (36) of the intermediate reduction shaft (31) toward the reduction shaft (32) when a predetermined magnitude of torque is produced at a tool holder side.
- The impact tool according to claim 5, wherein the torque limiter comprises: two parts which are configured by dividing the driven gear (37) of the reduction shaft (32) and of which one is an upper plate (45) provided rotatably relative to the reduction shaft (32) and meshed with the second gear (36) of the intermediate reduction shaft (31) and the other is a lower plate (46) configured to rotate integrally with the reduction shaft (32); an engageable member (48) provided on the lower plate (46) and configured to be biased toward a radial direction of protrusion thereof by a coil spring (47); and an engageable portion (49) provided on an inner side of the upper plate (45) and configured to be engageable with the engageable member (48), wherein the engageable member (48) is caused to engage with the engageable portion (49) by a pressing force of the coil spring (47) when the torque is within the predetermined magnitude, while the engageable member (48) is caused to move away from the engageable portion (49) against the pressing force of the coil spring (47) to cause the upper plate (45) alone to rotate at idle when the torque is out of the predetermined magnitude.
- The impact tool according to any one of claims 1 to 6, comprising an inner housing provided inside the housing (2) to define a sealed space in which an impact unit comprising the output shaft (9) and the impact mechanism is provided, wherein a proximity portion (14) having an inner surface proximate to an end face of a predetermined rotation shaft provided in the impact unit is formed in the inner housing, a vent hole (15) affording communication between an inside of the impact unit and an outside of the impact unit is formed in a surface of the proximity portion (14) opposed to the end face of the rotation shaft.
- The impact tool according to claim 7, wherein the rotation shaft is the output shaft (9) of the motor (8).
- The impact tool according to claim 7 or 8, wherein a protrusion (16) located coaxially with the vent hole (15) is formed at one of the end face of the rotation shaft and the surface of the proximity portion (14) in which the vent hole (15) is formed, and a recess (17) in which the protrusion (16) is inserted in a noncontact manner is formed at the other of the end face of the rotation shaft and the surface of the proximity portion (14) in which the vent hole (15) is formed.
- The impact tool according to claim 9, wherein the protrusion (16) has a shape of a tapering circular cone, and the recess (17) has a circular shape with an inverted tapered surface provided at an open side thereof, contoured to fit the shape of the circular cone of the protrusion (16).
- The impact tool according to any one of claims 7 to 10, wherein the proximity portion (14) has a tubular shape with a through hole (13) extending laterally and an underside thereof facing to an inside of the impact unit is proximate to the end face of the output shaft (9).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007079709A JP4965303B2 (en) | 2007-03-26 | 2007-03-26 | Impact tool |
JP2007079708A JP5026834B2 (en) | 2007-03-26 | 2007-03-26 | Hammer drill |
PCT/JP2008/053076 WO2008126480A1 (en) | 2007-03-26 | 2008-02-22 | Percussion tool |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2130651A1 EP2130651A1 (en) | 2009-12-09 |
EP2130651A4 EP2130651A4 (en) | 2011-08-31 |
EP2130651B1 true EP2130651B1 (en) | 2014-11-26 |
Family
ID=39863636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08711844.4A Active EP2130651B1 (en) | 2007-03-26 | 2008-02-22 | Impact tool |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2130651B1 (en) |
RU (1) | RU2477212C2 (en) |
WO (1) | WO2008126480A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009027442A1 (en) * | 2009-07-03 | 2011-01-05 | Robert Bosch Gmbh | Hand tool |
RU2012140965A (en) * | 2011-10-04 | 2014-03-27 | Макита Корпорейшн | POWER TOOLS (OPTIONS) |
EP2871028A1 (en) * | 2013-11-11 | 2015-05-13 | HILTI Aktiengesellschaft | Manual tool machine |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1097755B (en) * | 1958-05-17 | 1961-01-19 | Daimler Benz Ag | Device for venting internal combustion engines |
JPS53155501U (en) * | 1977-05-11 | 1978-12-06 | ||
SU1038476A2 (en) * | 1980-06-23 | 1983-08-30 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно-Монтажного Инструмента Вибраторов И Строительно-Отделочных Машин | Rotary percussive tool |
DE3320426C3 (en) | 1983-06-06 | 1998-03-26 | Hilti Ag | Ventilation for the housing space of a drilling or chiseling device |
DE4231987A1 (en) * | 1992-09-24 | 1994-03-31 | Bosch Gmbh Robert | Hand tool, in particular rotary hammer |
JP3447857B2 (en) * | 1995-08-18 | 2003-09-16 | 株式会社マキタ | Power tool torque transmission mechanism |
JP3292969B2 (en) * | 1995-08-18 | 2002-06-17 | 株式会社マキタ | Hammer drill |
DE10029728A1 (en) * | 2000-06-16 | 2001-12-20 | Hilti Ag | Hand tool |
GB2410212B (en) * | 2001-09-17 | 2006-02-08 | Milwaukee Electric Tool Corp | Rotary hammer |
JP2004351595A (en) | 2003-05-30 | 2004-12-16 | Hitachi Koki Co Ltd | Power tool |
JP4515181B2 (en) * | 2004-07-20 | 2010-07-28 | 株式会社マキタ | Electric hammer drill |
JP4405378B2 (en) * | 2004-12-24 | 2010-01-27 | 株式会社マキタ | Electric tool |
EP1728596B1 (en) * | 2005-06-02 | 2009-02-11 | Makita Corporation | Power tool |
-
2008
- 2008-02-22 EP EP08711844.4A patent/EP2130651B1/en active Active
- 2008-02-22 WO PCT/JP2008/053076 patent/WO2008126480A1/en active Application Filing
- 2008-02-22 RU RU2009139226/02A patent/RU2477212C2/en active
Also Published As
Publication number | Publication date |
---|---|
RU2009139226A (en) | 2011-05-10 |
EP2130651A1 (en) | 2009-12-09 |
RU2477212C2 (en) | 2013-03-10 |
WO2008126480A1 (en) | 2008-10-23 |
EP2130651A4 (en) | 2011-08-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1661667B1 (en) | Hammer drill having switching mechanism for switching operation modes | |
US9321163B2 (en) | Impact tool | |
RU2448828C2 (en) | Perforator | |
US7637328B2 (en) | Electrical power tool having vibration control mechanism | |
RU2570863C2 (en) | Percussion tool | |
RU2453420C2 (en) | Perforator | |
JPH04500043A (en) | Drilling or striking hammer | |
EP2578362B1 (en) | Power tool | |
EP2497609B1 (en) | Striking tool | |
US20110155402A1 (en) | Power Tool Having Lubricant Leakage Preventing Structure | |
EP2130651B1 (en) | Impact tool | |
CN109693211B (en) | Impact tool | |
JP4446248B2 (en) | Hammer drill | |
EP3514400A1 (en) | Multiplate friction clutch | |
JP4456559B2 (en) | Work tools | |
JP2009045732A (en) | Working tool | |
JP5007955B2 (en) | Hammer drill | |
JP5026834B2 (en) | Hammer drill | |
JP4965303B2 (en) | Impact tool | |
CN210389105U (en) | Electric hammer and gear adjusting mechanism thereof | |
JPH07328955A (en) | Hammer drill | |
GB2418635A (en) | Drilling and percussion hammer with dome shaped bearing | |
JP2015047661A (en) | Impact tool | |
JP2013078822A (en) | Work tool | |
CN201970287U (en) | Electric hammer |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20090918 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
A4 | Supplementary search report drawn up and despatched |
Effective date: 20110801 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: B25D 16/00 20060101ALI20110726BHEP Ipc: B25D 17/24 20060101AFI20110726BHEP Ipc: B25D 17/26 20060101ALI20110726BHEP |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R079 Ref document number: 602008035567 Country of ref document: DE Free format text: PREVIOUS MAIN CLASS: B25D0016000000 Ipc: B25D0017240000 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: B25D 17/24 20060101AFI20140708BHEP Ipc: B25D 17/26 20060101ALI20140708BHEP Ipc: B25D 16/00 20060101ALI20140708BHEP |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
INTG | Intention to grant announced |
Effective date: 20140902 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 697901 Country of ref document: AT Kind code of ref document: T Effective date: 20141215 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602008035567 Country of ref document: DE Effective date: 20150108 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: VDEP Effective date: 20141126 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 697901 Country of ref document: AT Kind code of ref document: T Effective date: 20141126 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20150326 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20150326 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20150226 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20150227 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602008035567 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20150222 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150228 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150228 Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
26N | No opposition filed |
Effective date: 20150827 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150222 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 10 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20080222 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20141126 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20231228 Year of fee payment: 17 Ref country code: GB Payment date: 20240108 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20240103 Year of fee payment: 17 |