Patents by Inventor Bobby Hu

Bobby Hu 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).

  • Wrench combination
    Publication number: 20050016332
    Abstract: A wrench combination includes a first wrench defining a circular space and a toothed face forming at a wall of the circular space. A second wrench is rotationally put in the circular space. The second wrench defines a bore and two apertures communicated with the bore. A least one claw is movably put in the apertures. The claw includes a toothed face for engagement with the toothed face of the first wrench. A switch is put in the bore for contact with the claw.
    Type: Application
    Filed: May 24, 2004
    Publication date: January 27, 2005
    Inventor: Bobby Hu
  • Wrench extension with a socket-coupling system
    Patent number: 6823762
    Abstract: A wrench extension with a socket-coupling system includes a socket extension shaft, a transmission member mounted in an axial passageway in an end of the wrench extension shaft, a ball mounted in a first transverse passageway in the end of the wrench extension shaft, and a push member mounted in a second transverse passageway in the wrench extension shaft. The transmission member includes a sliding portion that is in sliding contact with a sliding portion of the push member for urging the ball into a detent of a cavity of a socket coupled to the end of the wrench extension shaft. When the socket is subject to an axial force away from the wrench extension shaft, the transmission member is stopped by the push member to thereby prevent undesired decoupling of the socket.
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: November 30, 2004
    Inventor: Bobby Hu
  • Hook screw driver with a tool-coupling arrangement
    Patent number: 6820522
    Abstract: A hook screw driver includes a first body and a second body. An end of the first body is connected to an end of the second body. The other end of the first body and the other end of the second body are movable between an open position and a closed position for clamping a hook screw. The hook screw driver includes a tool-coupling portion for coupling with an end of a tool for tightening/loosening fasteners.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: November 23, 2004
    Inventor: Bobby Hu
  • Wrench with a simplified structure
    Patent number: 6807882
    Abstract: A wrench includes a handle, a head extended from the handle, and a drive member rotatably mounted in a compartment of the head. A cavity is defined in a web between the handle and the head and communicated with the compartment. A transverse hole is defined in the web and includes an inner end communicated with the cavity and an outer end communicated with outside. A pawl is slidably mounted in the cavity and includes a toothed side, an attachment side, and a pressing side. An elastic element includes a first end attached to the attachment side of the pawl and a second end attached to an anchor securely mounted in the transverse hole. The toothed side of the pawl is biased to engage with the drive member and the pressing side of the pawl is biased to press against a wall defining the cavity.
    Type: Grant
    Filed: May 8, 2002
    Date of Patent: October 26, 2004
    Inventor: Bobby Hu
  • High-torque reversible ratcheting wrench
    Publication number: 20040200322
    Abstract: A reversible ratcheting wrench includes a handle having a head, a drive member rotatably received in a hole, and a pawl slidably received in the compartment that is defined in an inner periphery delimiting the hole and that is communicated with the hole. A plurality of teeth are formed on a toothed side thereof and have a radius of curvature larger than that of teeth on an outer periphery of the drive member. When the pawl is in either ratcheting position, a portion of the teeth of the pawl meshes with the teeth of the drive member and the other portion of the teeth of the pawl are disengaged from the teeth of the drive member, leaving gap to avoid the seesaw effect that damages the teeth of the pawl and that reduces the torque-bearing capacity.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 14, 2004
    Inventor: Bobby Hu
  • Adjustable head for a wrench
    Publication number: 20040144217
    Abstract: A wrench includes a handle, a head having a pivotal portion pivotably connected to an end of the handle, and a retaining mechanism for allowing the head to be pivotally moved to a desired position relative to the handle and retaining the head in the desired position. The pivotal portion of the head includes a fore part and a rear part with reference to a ratcheting direction of the handle. The fore part includes an arcuate outer surface section. The rear part includes a toothed section having a plurality of teeth. The toothed section has a dedendum circle located inside an area delimited by the arcuate outer surface section. Thus, the thickness of the fore part is not reduced, preventing damage to the torque-bearing section in the fore part during operation.
    Type: Application
    Filed: April 23, 2003
    Publication date: July 29, 2004
    Inventor: Bobby Hu
  • Adjustable head for a wrench
    Publication number: 20040144218
    Abstract: A wrench includes a handle, a head having a pivotal portion pivotably connected to an end of the handle, and a retaining mechanism. The pivotal portion of the head includes two end portions and an intermediate portion between the end portions. The intermediate portion includes an arcuate outer surface section that has teeth to be releasably engaged with the retaining mechanism, allowing the head to be pivotally moved to a desired position relative to the handle and retaining the head in the desired position. Thus, the thickness of the respective end portion of the pivotal portion of the head is not reduced, preventing damage to the torque-bearing section in the respective end portion of the pivotal portion during operation.
    Type: Application
    Filed: December 29, 2003
    Publication date: July 29, 2004
    Inventor: Bobby Hu
  • Wrench with a fixed maximum operational torque
    Patent number: 6766717
    Abstract: A wrench includes a substantially L-shaped rod and a casing. The L-shaped rod includes a first section and a second section, with a driving portion being formed on the second section for engaging with a fastener. The casing includes a receiving section for accommodating the first section of the rod and a positioning hole for rotatably receiving a portion of the second section of the rod. An engaging member is mounted in a receptacle of the casing and biased to press against the first section of the rod, thereby exerting an engaging force between the first section of the rod and the engaging member. When a rotational force applied to the casing is smaller than the engaging force, the rod is turned to hereby turn the fastener. When a rotational force applied to the casing is greater than the engaging force, the casing slides while the rod is not turned.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: July 27, 2004
    Inventor: Bobby Hu
  • Wrench with a fixed maximum operational torque
    Patent number: 6766718
    Abstract: A wrench includes a rod, a retainer, and a casing for accommodating the retainer and allowing relative pivotal movement between the casing and the retainer. The rod includes a driving portion on an end thereof for engaging with a fastener. The retainer has a first end securely mounted to the rod to turn therewith and a second end. An engaging member is mounted in the casing and biased to engage with the second end of the retainer, thereby exerting an engaging force between the second end of the retainer and the engaging member. When a rotational force applied to the casing is smaller than the engaging force, the retainer and the rod are turned to thereby turn the fastener. When a rotational force applied to the casing is greater than the engaging force, the casing slides relative to the retainer while the retainer and the rod are not turned.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: July 27, 2004
    Inventor: Bobby Hu
  • Biasing arrangement for a pawl of a reversible ratchet-type wrench
    Publication number: 20040139823
    Abstract: A reversible ratchet-type wrench includes a handle and a head extended from the handle and having a hole. A web is defined between the handle and the head, and a cavity is defined in the web and communicated with the hole. The web further includes a compartment having a first end communicated with the cavity and a second end communicated with outside, thereby leaving a bridge in the web. A drive member is rotatably mounted in the hole of the head. A pawl is mounted in the cavity and includes a first side with ratchet teeth for releasably engaging with teeth on an outer periphery of the drive member. A switch member includes a turn-piece for manual operation and an actuating plate extended from the turn-piece and rotatably received in the second end of the compartment of the head. The switch member is switchable between two positions for changing ratcheting direction of the drive member.
    Type: Application
    Filed: January 5, 2004
    Publication date: July 22, 2004
    Inventor: Bobby Hu
  • Method for manufacturing a ratchet type ring spanner having a larger cavity for receiving a larger pawl
    Patent number: 6758641
    Abstract: A method for forming a cavity in a handle of a ratchet type ring spanner includes providing a ring spanner having a handle and a head extending from the handle, forming a cutout on a face of the head, the cutout being communicated with a hole of the head, placing a cutter in the hole of the head, and moving the cutter toward the handle until a shaft of the cutter is stopped by a periphery defining the cutout, thereby forming a cavity in the handle. The cavity thus formed is larger than that formed by conventional methods. Thus, a larger pawl can be received in the larger cavity, which, in turn, increases the overall torque-bearing capacity of the ratchet type ring spanner.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: July 6, 2004
    Inventor: Bobby Hu
  • Wrench with a fixed maximum operational torque
    Patent number: 6752051
    Abstract: A wrench includes a rod, a retainer, and a casing for accommodating the retainer and allowing relative rotational movement between the casing and the retainer. The rod includes a driving portion on an end thereof for engaging with a fastener. The retainer has a central portion securely mounted to the rod to turn therewith. At least one engaging member is mounted in the casing and biased to selectively engage with one of plural retaining sections of the retainer, thereby exerting an engaging force between the engaging member and an associated retaining section of the retainer. When a rotational force applied to the casing is smaller than the engaging force, the retainer and the rod are turned to thereby turn the fastener. When the rotational force applied to the casing is greater than the engaging force, the casing slides while the retainer and the rod are not turned.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: June 22, 2004
    Inventor: Bobby Hu
  • Wrench with a fixed maximum operational torque
    Patent number: 6752050
    Abstract: A wrench includes a rod, a retainer, a pressing member, and a casing for receiving the retainer and the pressing member. The rod includes a driving portion on an end thereof for engaging with a fastener. The retainer has a central portion securely mount to the rod to turn therewith. The pressing member is turned together with the casing when the casing is turned. The pressing member has at least one engaging member that is biased to selectively engage with one of plural retaining sections of the retainer, thereby exerting an engaging force between each of the ends of the pressing member and an associated one of the retaining sections of the retainer. When a rotational force applied to the casing is smaller than the engaging force, the retainer and the rod are turned to thereby turn the fastener.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: June 22, 2004
    Inventor: Bobby Hu
  • Wrench head
    Publication number: 20040099100
    Abstract: A wrench head includes a first end having a drive portion for driving a fastener. A second end of the wrench head includes a star polygonal hole that is a treble square hole having twelve angled portions. Each angled portion includes two sidewalls meeting at a common line. The respective sidewall of the respective angled portion joins an associated sidewall of another angled portion adjacent to the respective angled portion, forming a ridge.
    Type: Application
    Filed: November 14, 2003
    Publication date: May 27, 2004
    Inventor: Bobby Hu
  • Ratcheting wrench with quick tightening/loosening functions and fine adjusting functions
    Publication number: 20040093995
    Abstract: A ratcheting wrench includes a handle, a head extending from an end of the handle and having a hole communicated with a compartment in the end of the handle, a drive member rotatably mounted in the hole of the head, and a ratcheting mechanism. The drive member includes an inner periphery for securely holding a fastener-driving member, allowing joint rotation when the drive member is turned. The drive member further includes a flange formed on an end of an outer periphery thereof and located outside the head for manual rotation of the drive member. The ratcheting mechanism is mounted in the compartment of the handle and engaged with the teeth of the drive member, allowing the handle to selectively move in a ratcheting direction for tightening/loosening a fastener and in a free turning direction reverse to the ratcheting direction in which the fastener is not turned.
    Type: Application
    Filed: July 22, 2003
    Publication date: May 20, 2004
    Inventor: Bobby Hu
  • Easy-to-manufacture and easy-to-assemble ratcheting-type wrench
    Patent number: 6732614
    Abstract: A wrench comprises a handle and a head extended from the handle. A web is defined between the handle and the head. The head includes a compartment in which a drive member is rotatably received. The web includes a transverse through-hole having an intermediate portion communicated with the compartment. A cavity is defined in the web and communicated with the transverse through-hole. A switch member is mounted in the cavity and rotatable relative to the handle between two positions corresponding to two opposite ratcheting directions of the handle. A pawl is slidably mounted in the transverse through-hole for engaging with the drive member. The pawl remains in the transverse through-hole during operation.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: May 11, 2004
    Inventor: Bobby Hu
  • Gear wheel
    Patent number: D498775
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: November 23, 2004
    Inventor: Bobby Hu
  • Gear wheel
    Patent number: D498776
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: November 23, 2004
    Inventor: Bobby Hu
  • Gear wheel
    Patent number: D498777
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: November 23, 2004
    Inventor: Bobby Hu
  • Gear wheel
    Patent number: D498778
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: November 23, 2004
    Inventor: Bobby Hu