Hammer Head Driven By Relatively Moving Motion Transmitting Element Patents (Class 173/122)
  • Patent number: 11518013
    Abstract: An electric nail gun includes a supporting frame, a swing arm, a driving unit, and a safety unit. The swing arm has a driven segment and is pivotable relative to the supporting frame between a standby position and a shooting position. The driving unit includes a driving member in contact with the driven segment of the swing arm and operable for moving the swing arm towards the shooting position. The safety unit has a stopping member that is driven by the driving member to move relative to the driven segment between a stopping position, where the stopping member blocks movement of the driven segment, and a releasing position, where the movement of the swing arm towards the shooting position is permitted.
    Type: Grant
    Filed: January 24, 2020
    Date of Patent: December 6, 2022
    Assignee: Basso Industry Corp.
    Inventors: Chia-Yu Chien, Liang-Chi Hung
  • Patent number: 10195729
    Abstract: A driving device is adapted for use in an electric nail gun. The electric nail gun includes a supporting frame. The driving device includes a swing arm unit, a control unit and a driving unit. The swing arm unit is swingable between a standby position and a shooting position. The control unit includes a control member having a driven end portion, and an abutting end portion opposite to the driven end portion. The driving unit is for driving the driven end portion of the control member to rotate between a driving position and a non-driving position, and includes a control-member biasing resilient member disposed between the driven end portion of the control member and the supporting frame.
    Type: Grant
    Filed: October 10, 2016
    Date of Patent: February 5, 2019
    Assignee: Basso Industry Corp.
    Inventors: Chia-Yu Chien, Jian-Rung Wu
  • Patent number: 9988112
    Abstract: A mounting structure for a rig may include a base configured to support the mounting structure on an operating surface and a plurality of transport systems operatively connected to the base and configured to lift the mounting structure off of the operating surface. An elevated rig platform may be connected to the base by a plurality of support struts, wherein at least some of the support struts comprise a mounting connection that is configured to pivot to lower the elevated rig platform toward the base and place the mounting structure in a partially collapsed state. Additionally, a connecting member may be attached to one or more of the plurality of transport systems, wherein in response to the elevated rig platform being lowered to the partially collapsed state, the connecting member may be configured to displace at least a portion of the one or more transport systems.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: June 5, 2018
    Assignee: ENTRO INDUSTRIES, INC.
    Inventors: Shawn R. Smith, Harlan B. Smith
  • Patent number: 9731324
    Abstract: A tamper drive includes a wobble shaft rotatable about a central axis. The wobble shaft includes an eccentric hub recess within a movable bearing coupled to a yoke. The movable bearing rotates when the wobble shaft rotates to induce reciprocal movement of the yoke. In another tamper drive, an eccentric portion of a wobble shaft is rotatable within a bearing coupled to or integrated with an offset lobe having a pin slidingly disposed therein. Still another tamper drive includes an arm having a shaft fixedly coupled to one end, and first and second cam followers disposed at the other end. A rotatable cam provides a cam surface for each of the first and second cam followers.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: August 15, 2017
    Assignee: NORDCO INC.
    Inventor: Patrick Pritzl
  • Patent number: 9695566
    Abstract: A soil compacting device has an upper mass, a lower mass coupled to the upper mass so as to be capable of movement and having a soil contact plate, and a holding device for holding the soil compacting device, the holding device being situated so as to be capable of movement relative to the upper mass. In addition, a vibration decoupling device is provided that is situated between the upper mass and the holding device. The vibration decoupling device has a guide device for guiding the movement of the holding device relative to the upper mass. The guide device is fashioned such that the holding device is capable of displacement in parallel relative to the upper mass. The vibration decoupling device also has in addition a spring device.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: July 4, 2017
    Assignee: Wacker Neuson Produktion GmbH & Co. KG
    Inventor: Helmut Braun
  • Patent number: 8991516
    Abstract: An electric tool includes a gripping portion, a working portion rotatably connected to the gripping portion about an axis, an output shaft moving in a reciprocating manner and accommodated in the working portion, and a gear box accommodated in the gripping portion for driving the output shaft. The gear box has an opening so that the output shaft is moveable from one end to the other end of the opening when the working portion is rotated relative to the gripping portion about the axis. A leakage-preventing device, such as a bushing, is arranged at the opening so that the lubricating grease can be avoided from leaking.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: March 31, 2015
    Assignee: Chervon (HK) Limited
    Inventor: Gan Wei
  • Publication number: 20140326474
    Abstract: A hand-held power tool has a motor, a tool holder, and a percussion mechanism disposed between the motor and the tool holder in the drive train. The percussion mechanism includes a first shaft and a second shaft. A magnetically conductive ring gear is connected to the first shaft. An inner wall of the ring gear is eccentric to an axis of the second shaft. A magnetically conductive impeller is connected to the second shaft and is arranged to rotate within the ring gear. The impeller is spaced from the ring gear by a first air gap in a first position while being spaced from the ring gear by a second air gap in a second position, the first air gap being smaller than the second one. A magnet array is arranged coaxially to the second shaft. A magnetorheological fluid fills a cavity between the ring gear and the impeller.
    Type: Application
    Filed: October 17, 2012
    Publication date: November 6, 2014
    Inventors: Alexander Hoop, Albert Binder, Michael Wierer, Dieter Profunser
  • Patent number: 8813537
    Abstract: A vehicle body repair device repairs buckled or dented sheet metal to a desired condition. The device includes a housing and a first head coupled to the housing. The first head has an outer surface facing away from the housing. A second head is coupled to a handle. The second head has an outer surface facing away from the handle. A reciprocating unit is coupled to and positioned in the housing wherein the reciprocating unit urges the first head into repetitive contact with a sheet of material adjacent to the first head when the reciprocating unit is activated. Thus, the sheet of material is urged to conform to a shape defined by the outer surface of the first head and the outer surface of the second head when the sheet of material is positioned between the first head and the second head while the reciprocating unit is activated.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: August 26, 2014
    Inventor: Perfecto D. Diego
  • Patent number: 8813536
    Abstract: Described herein is technology for, among other things, removing a dent from a dented surface. The technology includes an automated hammering device positioned on a first side of the dent, and a dolly positioned on a second side of the dent. The automated hammering device repeatedly strikes the dent, thereby restoring proper curvature to the dented surface.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: August 26, 2014
    Assignee: Sears Brands, L.L.C.
    Inventor: Daniel C. Swanson
  • Publication number: 20140138112
    Abstract: A hammer drill serving as an impact tool is provided with a crank housing that accommodates a crankshaft, and a cylinder accommodated in the crank housing. Receiving portions that receive the cylinder which is pressed rearward are provided at multiple locations of the crank housing in the front-rear direction. At least one of the receiving portions is disposed to receive the rear-end portion of the cylinder. A portion of the cylinder, which is received by another one of the receiving portions is a circlip (circumferential member) made of a metal.
    Type: Application
    Filed: October 16, 2013
    Publication date: May 22, 2014
    Applicant: MAKITA CORPORATION
    Inventors: Hajime TAKEUCHI, Masanori FURUSAWA, Yoshiro TADA
  • Publication number: 20140054057
    Abstract: A rotary hammer is adapted to impart axial impacts to a tool bit. The rotary hammer includes a motor, a spindle coupled to the motor for receiving torque from the motor, and a piston at least partially received within the spindle for reciprocation therein. A crank hub is coupled to the motor for receiving torque from the motor. The crank hub defines a rotational axis and includes a socket offset from the rotational axis. A pin includes a first portion at least partially received within the socket and a second portion fixed to the piston. The first portion of the pin is both pivotable within the socket and axially displaceable relative to the socket in response to rotation of the crank hub for reciprocating the piston between a forward-most position within the spindle and a rearward-most position within the spindle.
    Type: Application
    Filed: August 20, 2013
    Publication date: February 27, 2014
    Applicant: Milwaukee Electric Tool Corporation
    Inventors: Benjamin Ludy, Daryl S. Richards
  • Patent number: 8485276
    Abstract: An auto hammer includes a housing having a grip, a head assembly arranged on one end of the housing, a motor mounted within the housing, a switch arranged on the housing for controlling the motor. There are at least two hand-holding positions on the housing where the switch can be triggered. The auto hammer may therefore be held by hands at a plurality of positions and will thereby be suitable for use in various circumstances.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: July 16, 2013
    Assignee: Chervon Limited
    Inventor: Gan Wei
  • Patent number: 8413742
    Abstract: It is an object of the invention to reduce noise caused by run-out of a tool bit in an impact tool. The representative impact tool according to the invention includes a tool holder 137 that houses a tool bit 119 in such a manner that the tool bit can linearly move in its axial direction, and a barrel 108 that is integrally connected to the tool holder 137 The impact tool further includes an elastic element 155 that is disposed between an inner circumferential surface of the tool holder 137 and an outer circumferential surface of the tool bit 119 in an end region of the tool bit 119 on the barrel side and connected in close contact with the tool holder 137 and the tool bit 119 over a predetermined length of the tool bit 119 in the axial direction. The elastic element 155 applies a biasing force to prevent a run-out of the tool bit 119 in a direction transverse to the axial direction. Further, an intermediate element 145 comes in point contact with the tool bit 119 on its axial center line.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: April 9, 2013
    Assignee: Makita Corporation
    Inventors: Hiroki Ikuta, Masao Miwa, Takuya Sumi
  • Publication number: 20130000937
    Abstract: An impact tool in which a tool body can be effectively reduced in size is provided. The impact tool has a motor 111, a swinging member 129 that is driven by the motor 111 and swings in the axial direction of the tool bit, a striking mechanism 115 that is driven by components of linear motion in the axial direction of the tool bit in the swinging motion of the swinging member 129, a connecting part 124 that connects the swinging member 129 and the striking mechanism 115, a housing member 151 that houses at least the connecting part 124 in an internal space 156, and a counter weight 155 that is disposed within the internal space 156 of the housing member 151 and reduces vibration caused when the tool bit is driven.
    Type: Application
    Filed: June 25, 2012
    Publication date: January 3, 2013
    Applicant: MAKITA CORPORATION
    Inventors: Shinji ONODA, Kiyonobu Yoshikane, Hitoshi Iida
  • Patent number: 8316962
    Abstract: It is an object of the invention to reduce noise caused by run-out of a tool bit in an impact tool. The representative impact tool according to the invention includes a tool holder 137 that houses a tool bit 119 in such a manner that the tool bit can linearly move in its axial direction, and a barrel 108 that is integrally connected to the tool holder 137 The impact tool further includes an elastic element 155 that is disposed between an inner circumferential surface of the tool holder 137 and an outer circumferential surface of the tool bit 119 in an end region of the tool bit 119 on the barrel side and connected in close contact with the tool holder 137 and the tool bit 119 over a predetermined length of the tool bit 119 in the axial direction. The elastic element 155 applies a biasing force to prevent a run-out of the tool bit 119 in a direction transverse to the axial direction. Further, an intermediate element 145 comes in point contact with the tool bit 119 on its axial center line.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: November 27, 2012
    Assignee: Makita Corporation
    Inventors: Hiroki Ikuta, Masao Miwa, Takuya Sumi
  • Patent number: 8297373
    Abstract: An impact device includes a housing, a motor supported by the housing, a stationary shaft, and a rotating transmission member supported on the stationary shaft for rotation. The rotating transmission member includes a hub having a first cam surface. The impact device also includes a rotating impact member carried by the transmission member and rotatable relative to the transmission member. The rotating impact member includes a lug protruding from an outer periphery of the rotating impact member and a second cam surface. The impact device further includes a spherical element engaged with the first and second cam surfaces on the hub of the rotating transmission member and the rotating impact member, respectively, an energy-absorbing member exerting a biasing force against the rotating impact member, and a reciprocating impact member oriented substantially normal to the stationary shaft and impacted by the lug of the rotating impact member.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: October 30, 2012
    Assignee: Milwaukee Electric Tool Corporation
    Inventors: William A. Elger, Jeremy R. Ebner
  • Publication number: 20120261152
    Abstract: An auto hammer includes a housing supporting a striking device, a motor arranged in the housing, a transmission mechanism driven by the motor and an impact assembly. The impact assembly includes an impact wheel and an intermediate shaft for supporting the impact wheel where an impact portion of the impact wheel is provided for impacting on a striking shaft of the striking device. The intermediate shaft is supported on a first supporting member and a second supporting member which are located at the opposite sides of the impact assembly. The axis of the intermediate shaft is substantially perpendicular to the output axis of the motor, and the proportion of the axial length of the intermediate shaft to the diameter of the motor is in a range of approximately 1 to 1.4.
    Type: Application
    Filed: April 12, 2012
    Publication date: October 18, 2012
    Applicant: CHERVON (HK) LIMITED
    Inventor: Gan Wei
  • Publication number: 20120247797
    Abstract: An auto hammer includes a motor arranged in a housing, a striking device arranged in a nozzle portion of the housing and a transmission mechanism for converting the rotating motion of the motor into the striking motion for the striking device. The transmission mechanism includes a striking assembly for exerting a striking motion to the striking device, the striking assembly includes a rotational driving member and a rotational striking member enclosing the rotational driving member, and the rotational striking member is provided with at least one striking portion for striking and contacting the striking device. The auto hammer has a gripping portion suitable for palm gripping which is arranged on a back side of the housing opposite to the striking device where the motor is arranged on the same side as the striking assembly relative to the axis of the reciprocating linear motion of a striking shaft of the striking device.
    Type: Application
    Filed: March 14, 2012
    Publication date: October 4, 2012
    Applicant: CHERVON (HK) LIMITED
    Inventor: Gan Wei
  • Patent number: 8261849
    Abstract: A power driven tool for rotating a mechanical element. The tool includes a housing and motor. The motor has an output shaft. The shaft rotates relative to the housing. The tool also includes an impact drive axially fixed within the housing. The impact drive includes a base and an anvil shaft having an anvil. The impact drive includes an annular hammer having opposite impact lands pivotally mounted on the base for movement between three positions, including a forward position in which the hammer is positioned so one impact land engages the anvil, a reverse position in which the hammer is positioned so another of the impact lands engages the anvil, and a disengaged position in which neither of the impact lands engages the anvil. Further, the tool includes a ratchet mechanism. The ratchet mechanism includes an output drive mounted for rotation relative to the housing for rotating a mechanical element.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: September 11, 2012
    Assignee: SP Air Kabushiki Kaisha
    Inventor: Shigeki Kobayashi
  • Patent number: 8256527
    Abstract: This invention provides an auto hammer comprising a housing, a head assembly including a striking device and transmission mechanism. The striking device includes a striking rod having a striking end. The transmission mechanism includes an impact wheel. The distance from the end surface of the striking end of the striking rod to the center of the impact wheel between 40 mm and 100 mm. This distance is arranged very small, in favor of the hammer being used in some narrow spaces. The auto hammer according to this invention meets the requirements of being used in narrow spaces by hands, thereby suitable for use in various circumstances.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: September 4, 2012
    Assignee: Chervon Limited
    Inventor: Shuming Wu
  • Publication number: 20120097409
    Abstract: A power tool is disclosed. The power tool has a pneumatic striking mechanism, which has a striking device that acts percussively along a working axis. A motor serves as the drive. A gear mechanism has a driving gear wheel and a driven gear wheel, where the driving gear wheel meshes with the driven gear wheel and at least the axis of rotation of the driven gear wheel is inclined to the working axis. The driving gear wheel is fabricated of metal and the driven gear wheel is fabricated of a carbon-fiber reinforced plastic.
    Type: Application
    Filed: October 21, 2011
    Publication date: April 26, 2012
    Applicant: Hilti Aktiengesellschaft
    Inventors: Rainer ONTL, Christoph Dieing, Ferdinand Kristen
  • Patent number: 8122972
    Abstract: A hollow piston drive mechanism for a hammer drill comprises a crank pin 54 having a cylindrical link member 68 rigidly connected to a part-spherical bearing 70. The part-spherical bearing 70 is slidably and rotatably disposed in a part-spherical recess 72 formed in the crank plate 52, as a result of which the bearing 70 can be easily mounted to the recess 72. The cylindrical link member 68 is slidably disposed in a cylindrical bearing 56 formed in the end of the hollow piston 58. The crank pin 54 is therefore able to rock back and forth in the spherical recess 72 as well as slide up and down in the cylindrical bearing 56.
    Type: Grant
    Filed: December 29, 2005
    Date of Patent: February 28, 2012
    Assignee: Black & Decker Inc.
    Inventors: Martin Soika, Klaus-Dieter Arich
  • Patent number: 8096369
    Abstract: The invention relates to a striking mechanism of a handheld electric power tool, in particular a percussion drill and/or percussion hammer, having a hammer cylinder, a piston mounted with a guide section inside the hammer cylinder in a longitudinally displaceable manner, and a piston outer guide on which a guide area of the piston is guided in a longitudinally displaceable manner. A piston end located outside the hammer cylinder comprises an overlap for overlapping an end area of the hammer cylinder, and the guide area at least partially belongs to the overlap or is affixed there.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: January 17, 2012
    Assignee: Robert Bosch GmbH
    Inventor: Gerhard Meixner
  • Publication number: 20110233257
    Abstract: A nailer device has a housing containing a motor and a transmission mechanism. The housing has a nozzle portion with a striking rod for striking a nail arranged therein, the striking rod being moved in a reciprocating manner. A rotating shaft is mounted in the housing and the rotating shaft is coupled to the output shaft of the motor through the transmission mechanism. An impact member surrounds the rotating shaft and is moved with the rotating shaft. Corresponding slots are formed on the rotating shaft and the impact member respectively and mate with each other with an engagement member being contained in the corresponding slots.
    Type: Application
    Filed: June 10, 2011
    Publication date: September 29, 2011
    Applicant: CHERVON (HK) LIMITED
    Inventors: Masatoshi Fukinuki, Toshinari Yamaoka, Gan Wei
  • Patent number: 7987920
    Abstract: A drill includes a housing and a motor coupled to an output member by a transmission. The transmission can selectively couple the output member to an output spindle through a low speed output gear or a high speed output gear for rotating the output spindle at a first speed or a second speed, respectively. Alternatively or additionally, a low speed mode can be provided by actuating an electronic switch that limits the speed of the motor. A rotatably fixed hammer member and a rotatable hammer member can be mounted around the output spindle. A mode collar can be rotatably mounted on the housing and around the output member for movement to positions that correspond to various mode of operation, including a low speed mode, a high speed mode, and a hammer-drilling mode. In the hammer-drilling mode, the transmission operates in the high speed mode.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: August 2, 2011
    Assignee: Black & Decker Inc.
    Inventors: James D. Schroeder, Dennis A. Bush, Paul K. Trautner
  • Patent number: 7971654
    Abstract: A rotary impact tool includes a drive shaft rotationally driven by a rotational drive power source, a hammer arranged around the drive shaft, a ball engaging with a cam groove formed on the outer circumferential surface of the drive shaft and a cam groove formed on the inner circumferential surface of the hammer, an anvil engageable with the hammer along a rotational direction and a spring for biasing the hammer toward the anvil. The hammer is designed to rotate along a rotational locus decided by the cam groove of the drive shaft and the cam groove of the hammer. The rotational locus of the hammer as seen in a development view describes a curve in which the lead angle of the rotational locus varies continuously with the change in hammer rotation angle.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: July 5, 2011
    Assignee: Panasonic Electric Works Power Tools Co., Ltd.
    Inventors: Atsushi Takeyama, Hidenori Shimizu
  • Publication number: 20110155778
    Abstract: An electric hammer includes a striking device having a clamping mechanism. The clamping mechanism includes a clamping element, a sliding element, a first biasing device and a second biasing device. The sliding element is provided with a guide portion in which the clamping element is slidable between a first position where the clamping element is closed and a second position where the clamping element is opened. The biasing force generated by the first biasing device is smaller than that of the second biasing device when the clamping element is in the opened position.
    Type: Application
    Filed: December 17, 2010
    Publication date: June 30, 2011
    Applicant: CHERVON LIMITED
    Inventors: Hongtao Zhou, Gan Wei
  • Publication number: 20110121048
    Abstract: An auto hammer having a housing, a grip portion and a striking device. The striking device includes a striking rod for striking a nail or other element using a straight reciprocating motion. The striking device has an associated clamping mechanism for clamping the nail or other element. The clamping mechanism has a driving portion, a first clamping portion, and a second clamping portion. The first and second clamping portions are moved between a closed position and an opened position. In the closed position, the element is held between the first and second clamping portions. A first slot and a second slot are arranged on the first and second clamping portions respectively. The driving portion is arranged in both the first and second slots and moves along the first and second slots.
    Type: Application
    Filed: February 4, 2010
    Publication date: May 26, 2011
    Applicant: Chervon Limited
    Inventor: Gan Wei
  • Publication number: 20110114349
    Abstract: An auto hammer with a striking device includes a striking rod and a clamping mechanism. The striking rod continually strikes a component to gradually insert the component into a workpiece. The clamping mechanism includes at least one clamping element, a biasing device, a bush and a sleeve, and the clamping elements are movable between a closed position and an opened position. The bush is arranged around the striking rod so as to prevent the nail head from becoming trapped in a gap which is formed after the clamping elements are entirely opened. The biasing device is arranged for biasing the bush toward the direction of striking the component. This clamping mechanism can reliably clamp nails or other components to facilitate user operation of the device.
    Type: Application
    Filed: November 17, 2010
    Publication date: May 19, 2011
    Applicant: CHERVON LIMITED
    Inventor: Hongtao Zhou
  • Publication number: 20110108298
    Abstract: An auto hammer includes a housing having a grip, a head assembly arranged on one end of the housing, a motor mounted within the housing, a switch arranged on the housing for controlling the motor. The head assembly includes a striking device having a receiving cavity which comprises a locking mechanism. When the receiving cavity is retracted into the housing and locked by pressing the locking pin downwardly, with the striking rod being revealed to increase the visibility of the striking rod. During operation, the objects to be processed, such as tenons and bricks, may be impacted by the striking rod in a linear reciprocating manner, so that the function of the tool can be expanded, without being limited to knocking the fastening pieces into the objects to be processed.
    Type: Application
    Filed: November 3, 2010
    Publication date: May 12, 2011
    Applicant: CHERVON LIMITED
    Inventor: Hongtao Zhou
  • Publication number: 20110108299
    Abstract: The invention provides an auto hammer being used between two surfaces perpendicular to each other and closer to the intersecting line of the two surfaces. To this end, the auto hammer comprises a housing having an upper portion, a motor contained in the housing, and a switch arranged on the housing for controlling the motor. When the auto hammer is used between two surfaces perpendicular to each other with opposite sides of the upper portion of the housing abutting against the two surfaces respectively, the distance from the central axis of the striking rod to the intersecting line of the two surfaces is between 10 mm and 40 mm, preferably 28 mm. This distance is arranged very small for allowing the auto hammer to be used closer to the intersecting line of the two surfaces.
    Type: Application
    Filed: November 3, 2010
    Publication date: May 12, 2011
    Applicant: CHERVON LIMITED
    Inventor: Gan Wei
  • Publication number: 20110100662
    Abstract: An auto hammer includes a housing having a grip, a head assembly arranged on one end of the housing, a motor mounted within the housing, a switch arranged on the housing for controlling the motor. The hardness of the material utilized for the head assembly of the auto hammer is lower than that of the housing. During operation, the material utilized for the head assembly makes the device feel more comfortable when held by hands. The hardness of the material utilized for the grip of the auto hammer is lower than that of the housing. During operation, the material utilized for the grip makes the device feel more comfortable when held by hands. The material utilized for two opposite sides of an upper portion of the housing is different from that of the remaining portion of the housing.
    Type: Application
    Filed: November 3, 2010
    Publication date: May 5, 2011
    Applicant: CHERVON LIMITED
    Inventor: Gan Wei
  • Publication number: 20110100660
    Abstract: This invention provides an auto hammer comprising a housing, a head assembly including a striking device and transmission mechanism. The striking device includes a striking rod having a striking end. The transmission mechanism includes an impact wheel. The distance from the end surface of the striking end of the striking rod to the center of the impact wheel between 40 min and 100 mm. This distance is arranged very small, in favor of the hammer being used in some narrow spaces. The auto hammer according to this invention meets the requirements of being used in narrow spaces by hands, thereby suitable for use in various circumstances.
    Type: Application
    Filed: February 4, 2010
    Publication date: May 5, 2011
    Applicant: Chevron Limited
    Inventor: Shuming Wu
  • Publication number: 20110100661
    Abstract: An auto hammer includes a housing having a grip, a head assembly arranged on one end of the housing, a motor mounted within the housing, a switch arranged on the housing for controlling the motor. There are at least two hand-holding positions on the housing where the switch can be triggered. The auto hammer may therefore be held by hands at a plurality of positions and will thereby be suitable for use in various circumstances.
    Type: Application
    Filed: October 26, 2010
    Publication date: May 5, 2011
    Applicant: CHERVON LIMITED
    Inventor: Gan Wei
  • Publication number: 20110100663
    Abstract: An auto hammer includes a housing having an upper portion, a head assembly arranged on one end of the housing, a motor mounted within the housing, a switch arranged on the housing for controlling the motor. The head assembly of the auto hammer additionally comprises a striking rod. The distance between the central axis of the striking rod and the top portion of the head assembly is between 5 mm and 26 mm, preferably 10.7 mm. This distance is arranged very small for allowing the auto hammer to be used closer to a base wall.
    Type: Application
    Filed: November 3, 2010
    Publication date: May 5, 2011
    Applicant: CHERVON LIMITED
    Inventor: Shuming Wu
  • Patent number: 7934566
    Abstract: A device for impacting a fastener in one embodiment includes a lever arm pivotable between a first position whereat a flywheel is spaced apart from a drive mechanism and a second position whereat the flywheel can contact the drive mechanism, a lever arm solenoid for pivoting the lever arm between the first position and the second position, a drive mechanism sensor for generating a position signal indicative of the position of the drive mechanism, a timer for generating a timing signal, a memory including program instructions, and a processor operably connected to the memory for executing the program instructions to (i) energize the solenoid to pivot the lever arm to the second position, (ii) de-energize the solenoid based upon the position signal, and (iii) de-energize the solenoid based upon the timing signal.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: May 3, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Eric Hlinka, John DeCicco
  • Publication number: 20110094764
    Abstract: An auto hammer includes a housing, a head assembly arranged on one end of the housing, a battery pack mounted at the other end of the housing, and a motor contained in the housing. The housing further includes a grip portion, where the gravity center of the auto hammer lies. The auto hammer is thereby more ergonomic so that the users feel more comfortable when holding the auto hammer and spend less effort during its operation.
    Type: Application
    Filed: October 26, 2010
    Publication date: April 28, 2011
    Applicant: CHERVON LIMITED
    Inventor: Gan Wei
  • Patent number: 7921933
    Abstract: In a driving tool, a diameter of an intermediate member is enlarged to increase a mass of the intermediate member and an outside diameter of a cylinder at a position where the intermediate member is internally provided is enlarged in accordance with the enlarged diameter of the intermediate member. Further, in the driving tool, a bearing thickness of a ball bearing is reduced correspondingly to a dimension of the enlarged outside diameter of the cylinder and a washer is provided at a part where the ball bearing abuts on the cylinder in the forward and backward moving direction thereof.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: April 12, 2011
    Assignee: Max Co., Ltd.
    Inventors: Terufumi Hamano, Akira Teranishi, Kazuya Sakamaki
  • Patent number: 7905377
    Abstract: A device for impacting a fastener in one embodiment includes a drive mechanism, a flywheel pivotable between a first flywheel position whereat the flywheel is not in contact with the drive mechanism and a second flywheel position whereat the flywheel contacts the drive mechanism, a motor operably connected to the flywheel, a trigger movable between a first trigger position and a second trigger position, and a WCE assembly movable between a first WCE position and a second WCE position, the WCE assembly configured such that (i) when the trigger is in the first trigger position and the WCE assembly is in the first WCE position, the WCE assembly mechanically engages the trigger to preclude movement of the trigger out of the first position, and (ii) when the WCE assembly is in the second WCE assembly position, the WCE assembly does not mechanically engage the trigger.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: March 15, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Harald Krondorfer, John DeCicco, Eric Hlinka, Chia Sheng Liang
  • Patent number: 7866411
    Abstract: A hand-held power tool, e.g. a high speed file or polisher has a single rotary drive shaft (8) to which there is locked a first eccentric member (1) in which a second eccentric member (2) can be rotated and locked forming a first assembly (10). The second eccentric member has an eccentrically placed crank pin in the form of a hollow needle bearing ring (2a) through which the drive shaft passes. The outer ring (7) of the needle bearing reciprocally drives a connecting rod (1.2) to a tool holder (9). The drive shaft also passes through an identical assembly (10f) of first and second eccentric members (1?, 2?) disposed upside down on the first assembly (10) and reciprocally driving, in the opposite direction and in counterphase, a counterweight, to cancel the reactive oscillating forces from the tool holder during operation, which would otherwise have to be absorbed by the hand and aim of the operator.
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: January 11, 2011
    Assignee: Dentatus AB
    Inventor: Erik Rondahl
  • Publication number: 20100326689
    Abstract: The invention relates to a striking mechanism of a handheld electric power tool, in particular a percussion drill and/or percussion hammer, having a hammer cylinder, a piston mounted with a guide section inside the hammer cylinder in a longitudinally displaceable manner, and a piston outer guide on which a guide area of the piston is guided in a longitudinally displaceable manner. A piston end located outside the hammer cylinder comprises an overlap for overlapping an end area of the hammer cylinder, and the guide area at least partially belongs to the overlap or is affixed there.
    Type: Application
    Filed: October 29, 2007
    Publication date: December 30, 2010
    Inventor: Gerhard Meixner
  • Publication number: 20100319946
    Abstract: The invention relates to a gearbox device, in particular, for a hammer drill or chisel, with a torque transmission mechanism, which has a first torque transmitting region for transmission of a torque to a first component and at least one second torque transmitting region for transmitting a torque to a second component. According to the invention, the first torque transmitting region and the second torque transmitting region at least partly have a corresponding partial contour for transmitting the torques.
    Type: Application
    Filed: January 29, 2008
    Publication date: December 23, 2010
    Inventors: Andre Ullrich, Tobias Herr
  • Patent number: 7828072
    Abstract: An impact tool for simultaneously providing a rotational force and an impact force to an object has an output shaft rotated by a motor, hammer for intermittently providing an impact force to the output shaft, hammer holder for movably holding the hammer, and an impact force generator for generating the impact force from an output of the motor. An air chamber is formed between the hammer and the hammer holder such that a volume of the air chamber is variable in response to a position of the hammer relative to the hammer holder. In addition, the hammer receives a bias force generated in a direction toward the output shaft by a biasing device. This bias force effectively increases the impact force in cooperation with an air pressure caused by a volume change of the air chamber.
    Type: Grant
    Filed: June 29, 2009
    Date of Patent: November 9, 2010
    Assignee: Panasonic Electric Works Co., Ltd.
    Inventors: Koichi Hashimoto, Hiroyuki Tsubakimoto, Hisashi Oda
  • Publication number: 20100206592
    Abstract: A hand-operated drive-in power tool for fastening elements is disclosed. The tool has a drive arrangement for a drive-in ram displaceably arranged in a guide, which has at least one drive element for the drive-in ram made at least partially of an elastomer that is tensible via a tensioning device. To improve the drive-in power tool, a heating device for the at least one elastomer drive element is provided.
    Type: Application
    Filed: February 17, 2010
    Publication date: August 19, 2010
    Applicant: Hilti Aktiengesellschaft
    Inventors: Hans GSCHWEND, Robert SPASOV
  • Patent number: 7743846
    Abstract: A rotary spindle 4 for a power tool such as a hammer drill is disclosed. The spindle 4 comprises a first spindle part 402 for rotation about its longitudinal an axis by means of a motor and having an inwardly directed rim 406, and a second spindle part 404 for supporting a drill bit of the hammer drill and having an outwardly directed rim 410. The second spindle part 404 extends through an aperture 408 in the first spindle part 402 and rims 406, 410 cooperate with each other to prevent removal of the second spindle part 404 from the first spindle part 402. A circlip 414 locks the first and second spindle parts 402, 404 together and maintains o-rings 412 under compression.
    Type: Grant
    Filed: June 6, 2005
    Date of Patent: June 29, 2010
    Assignee: Black & Decker Inc.
    Inventors: Stefan D. Gensmann, Martin Lauterwald, Reimund Becht
  • Patent number: 7717191
    Abstract: A shift bracket can be mounted on a shift rod for movement between a first, high-speed drilling mode and a second, low-speed drilling mode. Cooperating shift lock surfaces can be associated with the shift bracket and the shift rod, respectively. For example, a groove in the can create a shift lock surface on the shift rod. The shift bracket can be moved into a locked configuration where the cooperating shift lock surfaces can engage each other preventing movement of the bracket out of the high-speed drilling mode. The hammer mode can correspond to the high-speed drilling mode, but not to the low-speed drilling mode. A spring member can bias the bracket toward the locked position. An actuation member can be coupled to the shift bracket to overcome the biasing member and to rotate or perpendicularly move the bracket into an unlocked position. The actuation member can also move the shift member from the first mode to the second mode.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: May 18, 2010
    Assignee: Black & Decker Inc.
    Inventor: Paul K. Trautner
  • Publication number: 20100101815
    Abstract: A power driven tool for rotating a mechanical element. The tool includes a housing and motor. The motor has an output shaft. The shaft rotates relative to the housing. The tool also includes an impact drive axially fixed within the housing. The impact drive includes a base and an anvil shaft having an anvil. The impact drive includes an annular hammer having opposite impact lands pivotally mounted on the base for movement between three positions, including a forward position in which the hammer is positioned so one impact land engages the anvil, a reverse position in which the hammer is positioned so another of the impact lands engages the anvil, and a disengaged position in which neither of the impact lands engages the anvil. Further, the tool includes a ratchet mechanism. The ratchet mechanism includes an output drive mounted for rotation relative to the housing for rotating a mechanical element.
    Type: Application
    Filed: October 14, 2009
    Publication date: April 29, 2010
    Applicant: SP AIR KABUSHIKI KAISHA
    Inventor: Shigeki Kobayashi
  • Publication number: 20100078186
    Abstract: A rotary impact tool includes a drive shaft rotationally driven by a rotational drive power source, a hammer arranged around the drive shaft, a ball engaging with a cam groove formed on the outer circumferential surface of the drive shaft and a cam groove formed on the inner circumferential surface of the hammer, an anvil engageable with the hammer along a rotational direction and a spring for biasing the hammer toward the anvil. The hammer is designed to rotate along a rotational locus decided by the cam groove of the drive shaft and the cam groove of the hammer. The rotational locus of the hammer as seen in a development view describes a curve in which the lead angle of the rotational locus varies continuously with the change in hammer rotation angle.
    Type: Application
    Filed: September 28, 2009
    Publication date: April 1, 2010
    Applicant: Panasonic Electric Works Power Tools., Ltd.
    Inventors: Atsushi Takeyama, Hidenori Shimizu
  • Publication number: 20100071923
    Abstract: A power tool having a rotary impact mechanism and a mode change mechanism. The impact mechanism is driven by an output member of a transmission and includes a hammer and an anvil. The mode change mechanism includes a mode collar that is movable between a first position, in which the mode collar directly couples the hammer to the transmission output member to inhibit movement of the hammer relative to the spindle, and a second position in which the mode collar does not inhibit movement of the hammer relative to the spindle. A power tool having an impact mechanism with an external adjusting member that can be moved to vary a trip torque of the impact mechanism is also provided.
    Type: Application
    Filed: September 24, 2009
    Publication date: March 25, 2010
    Inventors: Scott M. Rudolph, Daniel Puzio, Sankarshan N. Murthy, Aris Cleanthous, Joseph Stauffer, Robert S. Gehret, James D. Hays, Qiang J. Zhang
  • Publication number: 20100065294
    Abstract: An object of the application is to improve power transmission to a movable element in a driving tool. The driving tool for driving a material to be driven into a workpiece includes rotationally driven first and second rotating elements, the movable element that can move in a direction that strikes the material to be driven, V-shaped first and second contact surfaces formed on the movable element, and a pressing member that applies a force to the movable element such that the first and second contact surfaces are pressed against the first and second rotating elements. The driving tool further includes a first motor for driving the first rotating element and a second motor for driving the second rotating element.
    Type: Application
    Filed: March 14, 2008
    Publication date: March 18, 2010
    Applicant: Makita Corporation
    Inventor: Shinji Hirabayashi