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door latch

Discussion in 'Technical Discussion' started by leihao, Dec 17, 2009.

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  1. leihao, Dec 17, 2009
    #1
    leihao

    leihao New Member

    Joined:
    Oct 31, 2008
    Messages:
    1
    Location:
    mechanical
    Hi;
    I am trouble in designing a close system of stern watertight door, which is for tender garage. I would like to use the hydraulic--pins and handle latchs together to close the door?
    But I donn't know what type latch is better.
  2. corinthian99, Dec 18, 2009
    #2
    corinthian99

    corinthian99 New Member

    Joined:
    Jan 12, 2006
    Messages:
    71
    Location:
    London, UK
    Hello
    Not quite sure what you mean by handle latches - dogs that swing out of the door as in a manually operated door. I think every hydraulically operated door I've seen has been secured by pins. Its mechanically very simple and easy to set up proximity switches to verify the pin's position. One mistake I have seen is where the tip of the pin has no chamfer - if the door is not well aligned the pin jams against the door rather than slipping into its hole usually resulting in a large bang and bits of metal flying off.

    Might want to post a photo of exactly what you mean.:)
  3. Henning, Dec 18, 2009
    #3
    Henning

    Henning Senior Member

    Joined:
    Sep 22, 2009
    Messages:
    940
    Location:
    Ft Lauderdale FL
    I've seen rotational dogs with central hydraulic actuation as well. Instead (actually in addition to the)of a wheel in the middle of the door, they have an arm hooked to a hydraulically driven linear actuator. You pull the pin which engages the traveler to the worm to use the wheel.