Zipwire trolley braking

{
  "publication_number": "US10023208B2",
  "country": "US",
  "kind": "B2",
  "title": "Zipwire trolley braking",
  "abstract": "A zipwire trolley having a plurality of zipwire engaging rollers, a swivelable brake block assembly adjacent to one of the rollers, the brake block having a zipwire-engaging cam by which the roller can be at least partially lifted off the zipwire when the trolley is moving in a rearward direction, the cam having a pair of tapered sidewalls tending to pinch respectively opposite sides of the upper part of the zipwire as the brake block progressively rotates when the trolley is moving in a rearward direction, thereby preventing or inhibiting further rearward movement of the trolley.",
  "claims": [
    "1. A zipwire trolley having a plurality of zipwire engaging rollers, a swivelable brake block adjacent to one of the rollers, the brake block having a zipwire-engaging cam by which the roller can be at least partially lifted off the zipwire when the trolley is moving in a rearward direction, the cam having a pair of tapered sidewalls tending to pinch respectively opposite sides of the upper part of the zipwire as the brake block progressively rotates when the trolley is moving in a rearward direction, thereby preventing or inhibiting further rearward movement of the trolley.",
    "2. A zipwire trolley according to claim 1 wherein the brake block is adjustable as to width.",
    "3. A zipwire trolley according to claim 2 wherein the brake block is adjustable by being split in a plane coincident with the major axis of the zipwire when the brake block is mounted thereon.",
    "4. A zipwire trolley according to claim 1 wherein the brake block is co-operable with a swivelable lever arm by which upon anti-clockwise rotation of the lever arm the brake block mechanism is disengaged, thereby allowing the zipwire trolley to be moved along the zipwire in a rearward direction relative to a normal forward direction.",
    "5. A zipwire trolley according to claim 4 wherein clockwise movement of the lever arm also disengages the brake block by causing the brake block to swivel away from the zipwire.",
    "6. A swivellable zipwire trolley brake block assembly having a cam with tapered sidewalls tending to pinch respectively opposite sides of the upper part of the zipwire as the brake block progressively rotates when the trolley is moving in a rearward direction, thereby preventing or inhibiting further rearward movement of the trolley.",
    "7. The brake block assembly of claim 6 wherein the brake block is adjustable as to width.",
    "8. The brake block assembly of claim 7 wherein the assembly is split in a plane coincident with the major axis of the zipwire when the brake block is mounted thereon.",
    "9. A brake block assembly according to claim 6 wherein the brake block is co-operable with a swivelable lever arm by which upon anti-clockwise rotation of the lever arm the brake block mechanism is disengaged, thereby allowing the zipwire trolley to be moved along the zipwire in a rearward direction relative to a normal forward direction of travel.",
    "10. A brake block assembly according to claim 9 wherein clockwise movement of the lever arm also disengages the brake block from the zipwire by causing the bracke block to swivel away from the zipwire."
  ],
  "cpc": [
    "B61H 9/04",
    "A62B 1/14",
    "A63G 21/22",
    "B61B 7/00",
    "B61H 9/02",
    "F16D 59/00",
    "F16D 63/008"
  ],
  "assignees": [
    "INT SAFETY COMPONENTS LTD"
  ],
  "filing_date": "2016-03-11",
  "publication_date": "2018-07-17",
  "grant_date": "2018-07-17",
  "priority_date": "2015-01-23",
  "application_number": "US-201615067742-A",
  "family_id": "52578008",
  "citations": [
    "DE1073393B",
    "EP0803268A1",
    "GB2513337A",
    "GB2518573B",
    "US2006288901A1",
    "US2011239898A1",
    "US2013220743A1",
    "US2013333586A1",
    "US2014196990A1",
    "US2014311376A1",
    "US5156240A",
    "US5323873A",
    "US5638919A",
    "US6019195A",
    "US8234980B2",
    "US9004235B2",
    "US9021962B2",
    "US9573605B2",
    "WO2010110821A1"
  ]
}