Quick-Raising Ladder Tip
Edward Doyle, a member of Engine Company No. 25, Fort Hill Square, Boston, Mass., has invented a device for raising the tip or upper section of an extension ladder in what he claims is less than one-half the time now required. The ladder is controlled by a system of differential gears contained in a long shallow box or casing which fits under the ladders and on to the chassis of the truck behind the engine. A 40-foot ladder can be raised in five turns of the crank, or 8 feet to a turn. In ten seconds the tip can be raised with his device, Doyle claims, whereas, under the present method the time taken for the same operation is from thirty seconds to one minute and from two four men are needed. Thirty-two turns of the crank are required to raise the top ladder to full height at present. One man can operate the crank with Doyle’s plan.
Hoseman Doyle recently invented a device for raising elevators which may become stalled and this machine, which is attached to the cables and used to assist in releasing persons caught in elevator accidents, has been officially adopted by the Boston fire department.
A small aluminum model of the ladder-raising apparatus has been made by Doyle. The illustrations show him explaining the “aerial” ladder tip quick raising plan to Captain McClay and members of Ladder Company 8, of the Boston fire department.