Patents by Inventor Eldwin Chang

Eldwin 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: 9417029
    Abstract: An arrow shaft pressing device for a crossbow includes a sleeve connected to one end of the aiming device and has a passage with an aperture defined through the lower end of the sleeve. A shoulder is formed at the connection portion between the passage and the aperture. A pressing member has a flange and a shank extending from the underside of the flange. The pressing member is located in the passage of the sleeve and the distal end of the shank extends beyond the aperture. A restriction member is connected to the top end of the sleeve. A resilient member is biased between the flange of the pressing member and the restriction member. The distal end of the shank of the pressing member resiliently presses the arrow shaft.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: August 16, 2016
    Assignee: POE LANG ENTERPRISE CO., LTD.
    Inventor: Eldwin Chang
  • Patent number: 9347731
    Abstract: A crossbow device at least comprises a stock with a body portion, a track, and a aiming position member. A lower bow portion is arranged at the front of the body portion which includes a connection portion and a first screw hole is arranged thereinside. A bow frame is fastened in the track and assembled with the aiming position member. A second screw hole is formed at the front of each rod. A bow string set is assembled with the bow frame. Tow positioning blocks are protruded in the limit groove and a third screw hole is arranged at each positioning block and corresponding to the second screw hole. A fourth screw hole is arranged at a hook portion and corresponding to the first screw hole. The screw members are screwed in the third screw hole, the second screw hole, and the fourth screw hole of the hook portion.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: May 24, 2016
    Assignee: POE LANG ENTERPRISE CO., LTD.
    Inventor: Eldwin Chang
  • Publication number: 20150285582
    Abstract: A crossbow includes a stock, a riser disposed at a front of the stock, a pair of limbs attached to opposite ends of the riser, first and second pulleys respectively mounted on rear tips of the limbs, and a bow string set. The stock. Each of the first and second pulleys includes a primary wheel and a secondary wheel. The bow string set includes a let-off cable, a first take-up cable and a second take-up cable. The let-off cable extends across and over the track of the stock and has opposite ends respectively trained about the primary wheels of the first and second pulleys. In particular, both of the first and second take-up cable extend across the stock and are substantially positioned higher than the let-off cable.
    Type: Application
    Filed: April 7, 2014
    Publication date: October 8, 2015
    Applicant: POE LANG ENTERPRISE CO., LTD.
    Inventor: Eldwin Chang
  • Publication number: 20150285581
    Abstract: A bow includes a riser, a pair of limbs, two pulleys, and a bow string set. Each pulley includes a primary wheel and a secondary wheel adjacent to the primary wheel. The bow string set includes a let-off cable, a first take-up cable and a second take-up cable. The let-off cable has opposite ends respectively trained about the primary wheels of the pulleys. The first take-up cable has one end strung about the secondary wheel of one of the pulleys, and the other end anchored to a right rear side of the riser, without extending across a launching path of the bow. Similarly, the second take-up cable has one end strung about the secondary wheel of the other pulley, and the other end anchored to a left rear side of the riser, without extending across the launching path of the bow.
    Type: Application
    Filed: April 7, 2014
    Publication date: October 8, 2015
    Applicant: POE LANG ENTERPRISE CO., LTD.
    Inventor: Eldwin Chang
  • Patent number: 9121659
    Abstract: A crossbow assembly includes a body having an insertion hole and a retention member protrudes from the insertion hole. A barrel has a first end inserted into the insertion hole and a second end of the barrel extends beyond the insertion hole. A recess is defined in the top of the second end of the barrel. An upper portion is connected to the top of the barrel. A lower portion is formed at the underside of the barrel. The thickness of the upper portion is smaller than or equal to a half of that of the lower portion. A bow unit is connected to the second end of the upper portion and includes a riser, two limbs and two cam units. The upper portion is connected to two plates extending from a slot in the riser by two bolts. The crossbow assembly has a stable weight center.
    Type: Grant
    Filed: August 7, 2014
    Date of Patent: September 1, 2015
    Assignee: POE LANG ENTERPRISE CO., LTD.
    Inventor: Eldwin Chang
  • Publication number: 20150226511
    Abstract: An archery bow includes a bow riser, a limb, a limb bolt and a pivot pin. The bow riser is formed at one end with a rearward portion that includes a cradle and a bridge spanning the cradle to form a passageway therebetween and a tunnel defined in an inner wall of the bridge. The limb bolt attaches a butt end of the limb to a forward portion of the bow riser. The pivot pin passes through the passageway in the rearward portion of the bow riser and positioned in the cradle of the rearward portion of the bow riser. Moreover, the pivot pin defines in a top a pair of recesses in which two limb members of the limb are nested respectively, and is formed on a bottom a pair of positioning studs together clasping opposite ends of the cradle of the rearward portion of the bow riser.
    Type: Application
    Filed: February 7, 2014
    Publication date: August 13, 2015
    Inventor: Eldwin Chang
  • Publication number: 20150211825
    Abstract: An archery bow includes a bow body, a first grip pad and a second grip pad. The bow body has a handle portion and a first through hole transversely defined in the handle portion. Each of the first and second grip pads is integrally formed of a resilient plastics material. Specifically, the first grip pad has an inner surface and an outer skidproof surface at opposite sides thereof, and is formed on the inner surface with a positioning stud detachably press-fit in the first through hole from one side of the handle portion. The second grip pad has an inner surface and an outer skidproof surface at opposite sides thereof, and is formed on the inner surface with a receptacle detachably press-fit in the first through hole from the opposite side of the handle portion so as to engage with the positioning stud of the first grip pad.
    Type: Application
    Filed: January 29, 2014
    Publication date: July 30, 2015
    Inventor: Eldwin Chang