Tilt-up door

  • US 9,091,107 B2
  • Filed: 09/10/2014
  • Issued: 07/28/2015
  • Est. Priority Date: 06/23/2009
  • Status: Active Grant
First Claim
Patent Images

1. A tilt-up door system for a building having an opening comprising:

  • first and second juxtaposed members having upper and lower portions extending substantially vertically along opposite sides of the opening;

    a door having an inside and an outside sized to span the opening having a top, a bottom and at least two vertical side members, the at least two vertical side members each having a horizontally extending pivot shaft tube positioned vertically between the top and bottom of the door;

    first and second carriages each including a horizontally extending pivot shaft journal, each of the carriages being arranged for vertical movement along respective ones of the first and second juxtaposed members;

    a pair of horizontally extending pivot shafts, each pivot shaft pivotally connecting a pivot shaft tube to a pivot shaft journal; and

    an actuator comprising vertically extending first and second hydraulic cylinders each mounted adjacent one of first and second juxtaposed members and connected to one of the first and second carriages operable to move the first and second carriages along respective ones of the first and second juxtaposed members, the first and second hydraulic cylinders each comprising;

    a supply port;

    a flow control valve connected to the supply port; and

    a solenoid check valve connected to the flow control valve and the hydraulic cylinder;

    a hydraulic pump, a motor for operating the hydraulic pump, and a hydraulic fluid tank; and

    a hydraulic circuit connecting the hydraulic pump and the supply ports of the first and second hydraulic cylinders;

    whereby, when the hydraulic pump is operated hydraulic fluid is pumped into the first and second hydraulic cylinders to move the first and second carriages vertically along respective ones of the first and second juxtaposed members.

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