Patents by Inventor Man-Chi Chang

Man-Chi Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9868195
    Abstract: A hand tool assembly includes a cylindrical first body having multiple first grooves. A driving head is connected to one end of the first body and has a ratchet wheel which is controlled by a ratchet mechanism in the driving head. The first body extends through the ratchet wheel. A handle unit is movably mounted to the first body and the handle unit is selectively positioned at one of the first grooves. The second body has two different connection portions on two ends thereof, and the second body can be replaced by other handle tools.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: January 16, 2018
    Inventor: Man-Chi Chang
  • Publication number: 20170106505
    Abstract: A ratchet wrench includes a tubular body, a ratchet unit, a driving head, a control unit and a connection unit. The ratchet unit is operated in either rotation mode or spinning mode. The control unit controls the ratchet unit to rotate clockwise or counter clockwise. The connection unit is connected with a tool. When the body is rotated, the ratchet unit drives the driving head to rotate an object connected to the driving head. When the tool is span relative to the body, the ratchet unit also drives the driving head to rotate an object.
    Type: Application
    Filed: October 18, 2015
    Publication date: April 20, 2017
    Inventor: Man-Chi Chang
  • Publication number: 20170106508
    Abstract: A hand tool assembly includes a cylindrical first body having multiple first grooves. A driving head is connected to one end of the first body and has a ratchet wheel which is controlled by a ratchet mechanism in the driving head. The first body extends through the ratchet wheel. A handle unit is movably mounted to the first body and the handle unit is selectively positioned at one of the first grooves. The second body has two different connection portions on two ends thereof, and the second body can be replaced by other handle tools.
    Type: Application
    Filed: October 19, 2015
    Publication date: April 20, 2017
    Inventor: Man-Chi Chang
  • Publication number: 20170066120
    Abstract: A hand tool assembly includes a rod and a handle which is pivotably connected to the rod, and a control unit which is movable along the rod. When the rod and the handle are located linearly, the control unit is moved to a position where the rod and the handle are secured linearly. When the handle is perpendicular to the rod, the control unit is moved another position where the handle is secured perpendicularly to the rod. The rod and the handle are able to be connected with different hand tools.
    Type: Application
    Filed: September 3, 2015
    Publication date: March 9, 2017
    Inventor: Man-Chi Chang
  • Patent number: 9120207
    Abstract: A pair of pliers includes two parts pivotably connected to each other. The two parts respectively have jaws located correspondingly. A control member has one end pivotably connected to one part and an operation rod is pivotably connected to the other part and has one end movably inserted into the control member. A control lever has a first hole through which the operation rod extends. The operation rod has a first engaging portion which is engaged with a second engaging portion of the control lever. A resilient member is in contact with the control lever to engage the second engaging portion with the first engaging portion to set a desired angle between the two parts.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: September 1, 2015
    Inventor: Man-Chi Chang
  • Patent number: 9068735
    Abstract: A magnetic retainer includes a body, a magnetic member, a plate and a light unit. The body has a space for receiving objects and the magnetic member is connected to the bottom of the body to attract the objects. The plate has a concaved portion for receiving the objects and is rotatably connected to the body. When the light unit is rotated to a first position relative to the plate, the light emitting member faces outside of the plate. When the light unit is rotated to a second position relative to the plate, the light emitting member faces the concaved portion of the plate.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: June 30, 2015
    Inventor: Man-Chi Chang
  • Patent number: 8869659
    Abstract: A hand tool includes a shank, a sleeve, a control member, a pressing member, an end piece and a resilient member. The shank has multiple annular grooves. The control member and the resilient member are located in the chamber of the sleeve and the end piece closes the sleeve. The shank extends through the control member and the end piece. When the pressing member is not applied by a force, the sleeve can only rotate relative to the shank and cannot move relative to the shank. When the sleeve is applied by a force, the sleeve can move relative to the shank.
    Type: Grant
    Filed: October 3, 2012
    Date of Patent: October 28, 2014
    Inventor: Man-Chi Chang
  • Publication number: 20140209199
    Abstract: A pipe sealing device includes a body, multiple mounting members and a sealing member. The body has a space and a first connection portion. Two first contact portions extend from the first end of the body and each mounting member has two second contact portions which contact the first contact portions. The mounting members are located in the space and each has a recess with which a pipe is engaged. The pipe has an opening which contacts the end faces of the recess. The sealing member has a second connection portion which is connected to the first connection portion of the body. The second connection portion has a sealing face which seals the opening of the pipe.
    Type: Application
    Filed: January 25, 2013
    Publication date: July 31, 2014
    Inventor: Man-Chi Chang
  • Publication number: 20140130641
    Abstract: A pair of pliers includes two parts pivotably connected to each other. The two parts respectively have jaws located correspondingly. A control member has one end pivotably connected to one part and an operation rod is pivotably connected to the other part and has one end movably inserted into the control member. A control lever has a first hole through which the operation rod extends. The operation rod has a first engaging portion which is engaged with a second engaging portion of the control lever. A resilient member is in contact with the control lever to engage the second engaging portion with the first engaging portion to set a desired angle between the two parts.
    Type: Application
    Filed: November 13, 2012
    Publication date: May 15, 2014
    Inventor: Man-Chi Chang
  • Publication number: 20140090524
    Abstract: A hand tool includes a shank, a sleeve, a control member, a pressing member, an end piece and a resilient member. The shank has multiple annular grooves. The control member and the resilient member are located in the chamber of the sleeve and the end piece closes the sleeve. The shank extends through the control member and the end piece. When the pressing member is not applied by a force, the sleeve can only rotate relative to the shank and cannot move relative to the shank. When the sleeve is applied by a force, the sleeve can move relative to the shank.
    Type: Application
    Filed: October 3, 2012
    Publication date: April 3, 2014
    Inventor: Man-Chi Chang
  • Publication number: 20130255449
    Abstract: A hand tool includes a body, two control units and a connection member. The body is connected with another tool. The two control units are respectively connected to the body and each control unit includes a control member, a sleeve, multiple engaging members, a connection ring and a resilient member. The connection member is mounted to the body and located between the two control units.
    Type: Application
    Filed: March 29, 2012
    Publication date: October 3, 2013
    Inventor: Man-Chi Chang
  • Patent number: 8464616
    Abstract: A tool includes first, second and third rods which are pivotably and pivotably connected to each other. The first rod is pivotably connected between the second and third rods. Control members, resilient members and contacting members are located at the pivotal portions so as to control the first rod to be pivotable or positioned relative to the second and third rods.
    Type: Grant
    Filed: September 25, 2011
    Date of Patent: June 18, 2013
    Inventor: Man-Chi Chang
  • Publication number: 20130128597
    Abstract: A magnetic retainer includes a body, a magnetic member, a plate and a light unit. The body has a space for receiving objects and the magnetic member is connected to the bottom of the body to attract the objects. The plate has a concaved portion for receiving the objects and is rotatably connected to the body. When the light unit is rotated to a first position relative to the plate, the light emitting member faces outside of the plate. When the light unit is rotated to a second position relative to the plate, the light emitting member faces the concaved portion of the plate.
    Type: Application
    Filed: January 9, 2013
    Publication date: May 23, 2013
    Inventor: Man-Chi Chang
  • Publication number: 20130118936
    Abstract: The present invention relates to a magnetic container which includes a main body, a magnetic body and a storage disc, wherein the main body has a storage part, a brim edge, a transversal long hole, a fastener and a receiving chamber. The magnetic body is disposed in the center of the main body. The pivot of the storage disc is pivotally connected in the transversal long hole of the main body so that the storage disc can open or overlap relatively to the storage part. The storage disc has a stop edge to support the brim edge, and fastening blocks to fasten the fastener. An elastically extendable fastening element is disposed in the receiving chamber. Tools and parts can be inserted or clamped in the fastening element. Thus, the magnetic container has multiple functions on magnetic sucking and parts storage.
    Type: Application
    Filed: November 15, 2011
    Publication date: May 16, 2013
    Inventor: Man-Chi Chang
  • Publication number: 20130074661
    Abstract: A tool includes first, second and third rods which are pivotably and pivotably connected to each other. The first rod is pivotably connected between the second and third rods. Control members, resilient members and contacting members are located at the pivotal portions so as to control the first rod to be pivotable or positioned relative to the second and third rods.
    Type: Application
    Filed: September 25, 2011
    Publication date: March 28, 2013
    Inventor: Man-Chi Chang
  • Patent number: 6735872
    Abstract: An improved cutter knife and particularly to a cutter knife allowing positive and inverse gripping when in use consists of an upper shell and a lower shell that are coupled to form a body. The body has one end forming a handgrip conforming to ergonomics to allow positive and inverse gripping. The handgrip has a blade anchor section and a blade fast change section on one end to allow positive or inverse gripping and fast replacement of the blade. The positive gripping may be used for ordinary cutting such as for paper or cloths. The inverse gripping may be used for heavy duty cutting with a greater force such as for cardboard or wooden laminates. Thus it provide dual functions and may be used conveniently to overcome the limitation of conventional cutter knives that allow only positive gripping.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: May 18, 2004
    Inventor: Man-Chi Chang
  • Patent number: D653452
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: February 7, 2012
    Inventor: Man-Chi Chang