Patents by Inventor Yi-Yong Liu

Yi-Yong Liu 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: 9969063
    Abstract: A ratchet wrench includes a first body made of light material and has a first recess, a closed bottom, a first hole, a first groove, a second recess and a shoulder formed between the first and second recesses. A second body made of strong material and has a first portion and a second portion so as to be respectively received in the first and second recesses. The first portion is rested on the shoulder. A ratchet wheel and a pawl respectively received in the second body, and a switch unit is connected to the second body to operate the pawl to be engaged with the ratchet wheel. The ratchet wrench has simple structure and easily assembled and manufactured. The ratchet wrench is light and durable.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: May 15, 2018
    Inventor: Yi-Yong Liu
  • Publication number: 20170209988
    Abstract: A ratchet wrench includes a first body made of light material and has a first recess, a closed bottom, a first hole, a first groove, a second recess and a shoulder formed between the first and second recesses. A second body made of strong material and has a first portion and a second portion so as to be respectively received in the first and second recesses. The first portion is rested on the shoulder. A ratchet wheel and a pawl respectively received in the second body, and a switch unit is connected to the second body to operate the pawl to be engaged with the ratchet wheel. The ratchet wrench has simple structure and easily assembled and manufactured. The ratchet wrench is light and durable.
    Type: Application
    Filed: January 27, 2016
    Publication date: July 27, 2017
    Inventor: Yi-Yong Liu
  • Patent number: 9440336
    Abstract: A ratchet wrench includes a body, a ratchet wheel, a pawl, a switch member and a resilient member. The body has three recesses to respectively accommodate the ratchet wheel, the pawl and the switch member. The pawl has a driving portion to be engaged with the toothed portion of the ratchet wheel. The pawl has a second engaging portion which is engaged with a first engaging portion of the ratchet wheel to position the ratchet wheel and the pawl in the two respective recesses respectively. The pawl has a protrusion which has a curved recess and a first stop. The switch member has a second stop, a reception recess and a hole. The protrusion is accommodated in the reception recess. The resilient member extends through the hole and the two ends of the resilient member contact the reception recess and the curved recess respectively.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: September 13, 2016
    Inventor: Yi-Yong Liu
  • Publication number: 20150298300
    Abstract: A ratchet wrench includes a body, a ratchet wheel, a pawl, a switch member and a resilient member. The body has three recesses to respectively accommodate the ratchet wheel, the pawl and the switch member. The pawl has a driving portion to be engaged with the toothed portion of the ratchet wheel. The pawl has a second engaging portion which is engaged with a first engaging portion of the ratchet wheel to position the ratchet wheel and the pawl in the two respective recesses respectively. The pawl has a protrusion which has a curved recess and a first stop. The switch member has a second stop, a reception recess and a hole. The protrusion is accommodated in the reception recess. The resilient member extends through the hole and the two ends of the resilient member contact the reception recess and the curved recess respectively.
    Type: Application
    Filed: June 11, 2014
    Publication date: October 22, 2015
    Inventor: Yi-Yong Liu