Stringer of a racket

{
  "publication_number": "US6764418B1",
  "country": "US",
  "kind": "B1",
  "title": "Stringer of a racket",
  "abstract": "A racket stringer includes a work table, and two opposite fixing devices each mounted on the work table and each including a rack, a guide plate, two foot posts, a support shaft, and a press rod. Thus, the fixing device has a quick positioning microadjustment function. In addition, the fixing device can be displaced easily and rapidly, thereby facilitating the user operating the racket sag stringer.",
  "claims": [
    "1. A racket stringer, comprising a work table, and two opposite fixing devices each mounted on the work table and each including a rack, a guide plate, two foot posts, a support shaft, and a press rod, wherein: the rack is mounted on the top of the work table and has a top face formed with a plurality of oneway ratchet teeth; the guide plate is mounted on the top of the work table and is formed with two elongated guide slots each parallel with the rack; each of the two foot posts is slidably mounted on the guide plate and has a bottom provided with a slide slidably mounted in a respective one of the two guide slots of the guide plate, thereby guiding the fixing device to displace on the work table reciprocally; the support shaft is rotatably mounted between the two foot posts; the press rod is extended through the support shaft and has a first end rested on the ratchet teeth of the rack and a second end formed with a rotation head for rotating the press rod; each of the fixing devices further includes: a support plate mounted on the bottom of the work table for supporting and securing the rack, and a plurality of locking screws each extended through the support plate and the work table and each locked in the guide plate; and a connecting seat mounted on the bottom of the support plate and secured on the slides of the two foot posts, and a plurality of locking bolts each extended through the connecting seat and the slides and each locked in a respective one of the two foot posts.",
    "2. The racket stringer in accordance with claim 1, wherein the guide plate is formed with a receiving slot to receive the rack.",
    "3. The racket stringer in accordance with claim 1, wherein the work table is formed with two elongated guide slots each aligning with a respective one of the two guide slots of the guide plate for guiding the slide of a respective one of the two foot posts.",
    "4. The racket stringer in accordance with claim 1, wherein the work table is formed with a receiving slot to receive the rack.",
    "5. The racket stringer in accordance with claim 1, wherein the support plate is formed with two elongated guide slots each aligning with a respective one of the two guide slots of the guide plate for guiding the slide of a respective one of the two foot posts.",
    "6. The racket stringer in accordance with claim 1, wherein the support shaft is formed with a screw bore, and the press rod is formed with an outer thread screwed into the screw bore of the support shaft.",
    "7. The racket stringer in accordance with claim 1, wherein each of the fixing devices further includes a torsion spring mounted between the support shaft and one of the two foot posts and having a first end secured on the support shaft and a second end secured on the respective foot post.",
    "8. The racket stringer in accordance with claim 7, wherein the support shaft has an end formed with a receiving recess to receive the torsion spring.",
    "9. The racket stringer in accordance with claim 1, wherein each of the fixing devices further includes a support base mounted between the two foot posts and having a top provided with a press plate.",
    "10. The racket stringer in accordance with claim 9, wherein each of the fixing devices further includes two positioning posts mounted on the support base."
  ],
  "description_excerpt": "1. Field of the Invention\n\nThe present invention relates to a stringer of a racket, and more particularly to a racket stringer having a frame fixing device with a quick positioning microadjustment function.\n\n2. Description of the Related Art\n\nA conventional racket stringer in accordance with the prior art shown in FIGS. 1 and 2 comprises a work table 1, and two opposite fixing devices 3 each mounted on the work table 1. Each of the fixing devices 30 includes a guide plate 2 mounted on the work table 1 and formed with an elongated guide slot 202, a base 4 slidably mounted on the guide plate 2 and has a bottom 402 provided with two pins 404 slidably mounted in the guide slot 202, a locking bolt 5 having a first end formed with a rotation head 502 and a second end extended through a washer 504 and the guide slot 202 and screwed into the bottom 402 of the base 4, two clamping arms 7 mounted on the base 4, an angle mechanism 9 mounted on the base 4 and provided with a rotation knob 902 to control the included angle between the two clamping arms 7, and a control mechanism 8 mounted on the base 4 and provided with a control knob 802 to move a resting plate 804 forward and backward.\n\nIn operation, the locking bolt 5 is unscrewed from the bottom 402 of the base 4, so that the base 4 can be moved freely, and the two fixing devices 3 can be moved outward relative to each other to reach the position of the frame of the racket. Then, the locking bolt 5 is screwed on the bottom 402 of the base 4, so that the base 4 is fixed.",
  "cpc": [
    "A63B 51/14"
  ],
  "ipc": [
    "A63B 51/14"
  ],
  "inventors": [
    "Min-Wei Lee"
  ],
  "filing_date": "2003-05-01",
  "publication_date": "2004-07-20",
  "grant_date": "2004-07-20",
  "priority_date": "2003-05-01",
  "application_number": "US-42687003-A",
  "family_id": "32681918",
  "cited_by_count": 16,
  "citations": [
    "US4546977A",
    "US5186505A",
    "US5568921A",
    "US5338028A",
    "US5590877A"
  ]
}