Patents by Inventor Chih-Min Chang

Chih-Min 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: 8770066
    Abstract: A ratchet wrench includes a handle, a ratchet wheel rotatably mounted in a head of the handle, a direction controller pivotally mounted in the head of the handle, and a pawl connected with the direction controller and engaged with the ratchet wheel. An O-ring is provided between the wall of a pivot hole of the handle head and the direction controller, such that the ratchet wrench is water and duct resistant so as to prevent the internal parts of the ratchet wrench from damage due to corrosion.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: July 8, 2014
    Inventor: Chih-Min Chang
  • Patent number: 8683893
    Abstract: A ratchet wrench includes a main body provided at an end portion thereof with an accommodation, a pawl installed in the accommodation, and a ratchet wheel rotatably installed in the accommodation and engaged with the pawl. The main body has a through hole into which a plug is detachably inserted. The through hole of the main body is provided through a surface of the main body and communicated with the accommodation. Removing the plug from the through hole of the main body enables lubricant or cleaner to be poured through the through hole into and out of the accommodation for lubricating or cleaning the internal parts of the ratchet wrench so as to make the ratchet wheel run more smoothly.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: April 1, 2014
    Inventor: Chih-Min Chang
  • Publication number: 20140053690
    Abstract: A detachable ratchet wrench spanner made accordance with the present invention includes a spanner body, a ratchet gear, a retaining collar, and a locking device. The spanner body includes a first surface, a second surface, and a through hole extending from the first surface to the second surface, and an annual recess defined within an inner wall of the through hole. A ratchet gear is rotationally disposed within the through hole. And a retaining collar is attached to a first opening of the through hole located on the first surface. The retaining collar includes a blocking ring and an anchor and a retainer extending from the blocking ring, wherein the blocking ring is located within the through hole, and the anchor is disposed within the annual recess of the spanner body, and the retainer is engaged to the spanner body with a locking device.
    Type: Application
    Filed: June 26, 2013
    Publication date: February 27, 2014
    Inventor: Chih-Min CHANG
  • Publication number: 20140026720
    Abstract: A ratchet wrench includes a wrench body, a ratchet rotatably mounted in the wrench body and defining therein a through hole for accommodating a screw nut, a magnetic member mounted in the through hole, and one or multiple limiters mounted in the through hole of the ratchet to hold the magnetic member in place. Thus, the opposing ends of the ratchet can be selectively used to accommodate a mating screw nut and the accommodated screw nut can be secured in place inside the ratchet by the magnetic attractive force of the magnetic member, avoiding screw nut displacement or falling and facilitating the use of the ratchet wrench. Further, the ratchet can be configured to have a stepped through hole for selectively accommodating different sizes of screw nuts.
    Type: Application
    Filed: July 26, 2012
    Publication date: January 30, 2014
    Inventor: Chih-Min CHANG
  • Publication number: 20140020519
    Abstract: A ratchet wrench includes a wrench body and a ratchet rotatably mounted in a ratchet hole of the wrench body and provided with one end protruding out of the ratchet hole for connection of a driving wheel. Thus, a user can rotate the driving wheel to force the rotation of the ratchet, such that a screw nut accommodated in the ratchet can be secured or loosened quickly and conveniently.
    Type: Application
    Filed: March 14, 2013
    Publication date: January 23, 2014
    Inventor: Chih-Min CHANG
  • Patent number: 8631723
    Abstract: A ratchet wrench includes a handle having a receiving hole, a ratchet wheel rotatably mounted in the handle, a direction controller pivotally mounted in the handle and provided at a periphery thereof with a guide groove, a pawl connected with the direction controller and engaged with the ratchet wheel, and a positioning member. When the direction controller is in a first position, a positioning ball of the positioning member is slidable to the receiving hole of the handle through the guide groove. When the direction controller is turned to a second position, the positioning ball is supported by a spring and engaged with a positioning notch of the direction controller so as to hole the direction controller in position.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: January 21, 2014
    Inventor: Chih-Min Chang
  • Publication number: 20130314947
    Abstract: Disclosed is an LED light bulb that also serves a night light, including a reflection structure, a cover, a circuit board, a heat dissipater, a power connector, and a light guide bar. The heat dissipater is mounted between and coupled with a cover and a power connector, the reflection structure is mounted to a top of the cover, the light guide bar has one end connected to the reflection structure, the multiple LED elements mounted on the circuit board which is attached to the heat dissipater, and the LED elements emits light that gets incident to the light guide bar.
    Type: Application
    Filed: May 22, 2012
    Publication date: November 28, 2013
    Applicant: PARA LIGHT ELECTRONICS CO., LTD.
    Inventors: PO-YU YANG, CHIH-MIN CHANG
  • Publication number: 20130314912
    Abstract: Disclosed is an LED light bulb with large-angle light emission, which includes a reflection structure, a cover, a circuit board, a heat dissipater, and a power connector. The reflection structure is detachably mounted to a top of the cover. The heat dissipater has a top end coupled to a bottom end of the cover. The circuit board includes at least one LED element mounted thereon. The circuit board is attached to the heat dissipater in such a way that the circuit board is housed in the cover to allow the at least one LED element to project light toward the cover and the reflection structure. The power connector is mounted to a bottom end of the heat dissipater.
    Type: Application
    Filed: May 22, 2012
    Publication date: November 28, 2013
    Applicant: PARA LIGHT ELECTRONICS CO., LTD.
    Inventor: CHIH-MIN CHANG
  • Publication number: 20130139656
    Abstract: A ratchet wrench includes a wrench body having a through hole, a driving member rotatably mounted in the through hole and having a center hole for engagement with a nut, a pawl, a positioning device, a magnetic ring mounted on a top side of the driving member, and a block ring made of non-magnetic material capped on the driving member and having a stop flange in contact with a top side of the magnetic ring. The magnetic ring is used to retain the nut in the center hole such that the nut is unable to drop out of the center hole of the driving member when the nut is tightened or loosened by the ratchet wrench.
    Type: Application
    Filed: January 30, 2013
    Publication date: June 6, 2013
    Inventor: Chih-min CHANG
  • Publication number: 20130139655
    Abstract: A ratchet wrench includes a handle having a receiving hole, a ratchet wheel rotatably mounted in the handle, a direction controller pivotally mounted in the handle and provided at a periphery thereof with a guide groove, a pawl connected with the direction controller and engaged with the ratchet wheel, and a positioning member. When the direction controller is in a first position, a positioning ball of the positioning member is slidable to the receiving hole of the handle through the guide groove. When the direction controller is turned to a second position, the positioning ball is supported by a spring and engaged with a positioning notch of the direction controller so as to hole the direction controller in position.
    Type: Application
    Filed: December 1, 2011
    Publication date: June 6, 2013
    Inventor: Chih-Min CHANG
  • Publication number: 20130118317
    Abstract: A ratchet wrench includes a handle, a ratchet wheel rotatably mounted in a head of the handle, a direction controller pivotally mounted in the head of the handle, and a pawl connected with the direction controller and engaged with the ratchet wheel. An O-ring is provided between the wall of a pivot hole of the handle head and the direction controller, such that the ratchet wrench is water and duct resistant so as to prevent the internal parts of the ratchet wrench from damage due to corrosion.
    Type: Application
    Filed: December 1, 2011
    Publication date: May 16, 2013
    Inventor: Chih-Min CHANG
  • Publication number: 20130074659
    Abstract: A ratchet wrench includes a main body provided at an end portion thereof with an accommodation, a pawl installed in the accommodation, and a ratchet wheel rotatably installed in the accommodation and engaged with the pawl. The main body has a through hole into which a plug is detachably inserted. The through hole of the main body is provided through a surface of the main body and communicated with the accommodation. Removing the plug from the through hole of the main body enables lubricant or cleaner to be poured through the through hole into and out of the accommodation for lubricating or cleaning the internal parts of the ratchet wrench so as to make the ratchet wheel run more smoothly.
    Type: Application
    Filed: September 22, 2011
    Publication date: March 28, 2013
    Inventor: Chih-Min CHANG
  • Publication number: 20120210829
    Abstract: A ratchet wrench includes a wrench body having a through hole, a driving member rotatably mounted in the through hole and having a center hole for engagement with a nut, a pawl, a positioning device, a magnetic ring mounted on a top side of the driving member, and a block ring capped on the driving member and having a stop flange in contact with a top side of the magnetic ring. The magnetic ring is used to retain the nut in the center hole such that the nut is unable to drop out of the center hole of the driving member when the nut is tightened or loosened by the ratchet wrench.
    Type: Application
    Filed: March 31, 2011
    Publication date: August 23, 2012
    Inventor: Chih-Min CHANG
  • Patent number: 8230766
    Abstract: A wrench for different-sized nuts includes a handle having an opening at a first end thereof and a slot communicated with the opening, an adjustment screw threadedly inserted into the handle and passing through the slot for adjusting a gap of the slot, a first working head rotatably connected with the first end of the handle in such a way that one of first and second mounting portions of the first working head is selectively positionable in the opening of the first end of the handle, and different-sized first and second ratchet sockets rotatably and respectively mounted with the first and second mounting portions. By means of the adjustment screw, the rotationability of the first working head relative to the first end of the handle can be adjusted.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: July 31, 2012
    Inventor: Chih-Min Chang
  • Publication number: 20120017729
    Abstract: A wrench includes a first handle portion, a first wrench head integrally connected with the first handle portion, a second handle portion integrally connected with the first handle portion, and a second wrench head integrally connected with the second handle portion. The second handle portion is twisted about a longitudinal axis of the wrench by a predetermined angle in a range of 75-85 degrees relative to the first handle portion, such that the wrench can offer a comfortable gripping feeling to the user by the aforesaid ergonomic twisted handle design.
    Type: Application
    Filed: July 21, 2010
    Publication date: January 26, 2012
    Inventor: Chih-Min CHANG
  • Patent number: D648995
    Type: Grant
    Filed: November 23, 2010
    Date of Patent: November 22, 2011
    Inventor: Chih-Min Chang
  • Patent number: D660109
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: May 22, 2012
    Inventor: Chih-Min Chang
  • Patent number: D660666
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: May 29, 2012
    Inventor: Chih-Min Chang
  • Patent number: D661560
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: June 12, 2012
    Inventor: Chih-Min Chang
  • Patent number: D713226
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: September 16, 2014
    Inventor: Chih-Min Chang