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  1. #51
    Join Date
    Dec 2009
    Posts
    1,485
    Country: United States

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    I found the patent for the Hall's door - http://pdfpiw.uspto.gov/.piw?Docid=00363118&idkey=NONE

    Click image for larger version. 

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  2. #52
    Join Date
    Jun 2008
    Location
    Hartford CT
    Posts
    191
    Country: United States

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    A very rare door indeed.

    DH
    Attached Thumbnails Attached Thumbnails inner.jpg   dials, handle, and indicator.jpg   1 outer.jpg   comb lock.jpg  

  3. #53
    Join Date
    Aug 2013
    Posts
    1,755
    Country: Wales

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    Quote Originally Posted by Doug MacQueen View Post
    I see the pressure bars do not work the same as what we are used to seeing. Instead of rotating, they move in and out. So that indicator is showing the bar position. Never saw that setup before.
    Hats off to Doug, well spotted on those expanding pressure bars.

    The whole door has an almost steampunk look from that massive train of spur gears, like something out of a H G Wells novel. Great to see such early and rare examples still intact and original.

  4. #54
    Join Date
    Dec 2009
    Posts
    1,485
    Country: United States

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    More on the Hall's door in Milwaukee, I found a couple of nice images today -

    Click image for larger version. 

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    I used to wonder if the pressure system originally had a cover, but the idler gears are etched, so apparently not.

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