GRAHAM MCDONALD,RICHARD VOLLEBREGT,ROBERT LICKERS,WAYNE LICKERS
申请号：
BR112014002651
公开号：
BR112014002651A2
申请日:
2012.08.03
申请国别(地区):
BR
年份:
2017
代理人:
摘要：
patent summary: "retractable roof". The present invention relates to a roof structure for protecting a crop growth area which includes a retractable roof membrane or curtain that defines sloping sections of the roof. The membrane is supported on cables and extends across the valley between sloping sections. openings in the membrane are provided to allow water to pass through the membrane. A drip can be arranged in the valley below the openings to collect water and to discharge it out of the growing area of the crop. A rotating impulse tube mounted on an inner rafter has cables attached to the impulse tube with a spring attached to each cable to regulate the minimum cable tension. the thrust system is positioned so that the membrane adjacent to the thrust tube in the inner inclined rafter can move the same distance as the second membrane of the thrust system. the rafter contains profiles to allow the stationary end of said membrane to be joined to said rafters by using a round tube and a "c" shaped profile to be continuously installed along said rafter to provide a water tight connection between the said rafter and said membrane. The rafter also contains clamps that provide the ability to constrain the guide ropes that suspend said membrane such that the ropes are secured to inhibit vertical, lateral and horizontal movement at the inner rafter locations with a different clamp on an adjacent rafter. to a wall of the perimeter of the structure such that the guide cable can only move perpendicular to the rafter. Guide cables are typically supported by scissors, but can now alternatively be supported by a network of flexible cables or rods at a lower cost. To allow ventilation and rain protection simultaneously, a secondary membrane is installed below a roof opening, in which secondary membrane carries rainwater that has penetrated through the roof opening into a drip. To maximize the reduction in crop-level temperatures during the summer, and to keep the heat closer to
