. Railway age gazette . s used with either base. A chuck is provided whichwill hold either the cup or the spherical grinder and which hasa shank suitable for use in an air motor or hand brace. Whenthe grinders lose their contour they may be melted and re-moulded with no waste of material. The chucks and themould are furnished by the Locomotive Superheater Company. GRAVITY FIRE DOOR A foot operated locomotive fire door, the two halves of whichare so arranged as to counterbalance each other, thus makingunnecessary the employment of a power cylinder, has been de-veloped and patented by P. C. With
. Railway age gazette . s used with either base. A chuck is provided whichwill hold either the cup or the spherical grinder and which hasa shank suitable for use in an air motor or hand brace. Whenthe grinders lose their contour they may be melted and re-moulded with no waste of material. The chucks and themould are furnished by the Locomotive Superheater Company. GRAVITY FIRE DOOR A foot operated locomotive fire door, the two halves of whichare so arranged as to counterbalance each other, thus makingunnecessary the employment of a power cylinder, has been de-veloped and patented by P. C. Withrow, mechanical engineer ofthe Denver & Rio Grande. As showri m the engraving the door is in two sections, the-pper part being pivoted at the left and the lov^er part at theright. It is opened by means of a foot lever located at the leftand 20 in. out from the back head. This lever operates thedoor opening cam, which has a specially formed shoe at its up-per end bearing against the under side of the upper door at Gravity Fire Door Locked in Open Position As pressure on the foot lever opens the door the point of con-tact between the cam and the door shifts from A to E. Thisgives a comparatively large leverage by means of which tostart the door without unnecessary effort, and the decreasingleverage as the movement progresses keeps the travel of thefoot pedal within reasonable limits. The upper and lower sections of the door are connected bymeans of rods B and D and equalizer C. The pin F which con-nects rod B to the upper door is located above the hinge pin G,thus causing it to swing in closer to the vertical line through the hinge pin as the door is opened. The leverage of the upperdoor, the weight of which causes the closing movement, is thusincreased. It will be noted that the pin which secures rod Dto the lower section of the door is located at a point muchnearer the horizontal center line through the hinge pin than ispin F in the upper door. The increase in leverage of t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
