Re: Coal Pockets, front aprons?
Posted by Todd Hackett on Apr 30, 2016; 3:28pm
URL: http://c-sng-discussion-forum.254.s1.nabble.com/Coal-Pockets-front-aprons-tp5126p5134.html
In the basic Burnett & Clifton design, each chute is nearly a stand-alone structure with four legs. The side boards for the chute are attached directly to the inside of the legs, and the apron sides with counterweights are on the outside. Each bin has its own legs, so there is a narrow gap between legs of adjacent chutes containing the sides of aprons for both chutes.
At Como, the bins don't have their own legs. The side boards don't attach to the legs. You can see in the photo that the side boards are inside the apron sides - considerably narrower than the space between the structure legs. The floor probably doesn't extend beyond the side boards, leaving room for the counterweighted extensions of the apron sides to swing past. The following sketch shows a possible arrangement. The sections are taken between the leg and the apron side. Red shows the fixed chute structure, green shows the apron in its raised position, and blue is the chute in the closed position. In the front view, I added dashed red lines to show the legs as they extend upward, as well as the sides of the chute and extension of the apron sides (in green).
URL: http://c-sng-discussion-forum.254.s1.nabble.com/Coal-Pockets-front-aprons-tp5126p5134.html
Okay, I think I understand. I think the confusion comes from a major difference in construction between the Burnett & Clifton style of coal chutes and the Williams, White & Co design used at Como. I'm not sure if the rest of the C&S docks were Burnett & Clifton, but they seem to follow much of the basic structure. The only C&S coal dock where there was a distinction between large & small chutes was Pine, where the larger chutes may have bee added later using different construction.
In the basic Burnett & Clifton design, each chute is nearly a stand-alone structure with four legs. The side boards for the chute are attached directly to the inside of the legs, and the apron sides with counterweights are on the outside. Each bin has its own legs, so there is a narrow gap between legs of adjacent chutes containing the sides of aprons for both chutes.
At Como, the bins don't have their own legs. The side boards don't attach to the legs. You can see in the photo that the side boards are inside the apron sides - considerably narrower than the space between the structure legs. The floor probably doesn't extend beyond the side boards, leaving room for the counterweighted extensions of the apron sides to swing past. The following sketch shows a possible arrangement. The sections are taken between the leg and the apron side. Red shows the fixed chute structure, green shows the apron in its raised position, and blue is the chute in the closed position. In the front view, I added dashed red lines to show the legs as they extend upward, as well as the sides of the chute and extension of the apron sides (in green).
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