A jin-pole or gin pole is a rigid pole

Utility pole

A utility pole is a pole used to support overhead power lines and various other public utilities, such as cable, fibre optic cable, and related equipment such as transformers and street lights. It can be referred to as a telephone pole, power pole, hydro pole, telegraph pole, or telegraph post,...

 with a pulley

Pulley

A pulley, also called a sheave or a drum, is a mechanism composed of a wheel on an axle or shaft that may have a groove between two flanges around its circumference. A rope, cable, belt, or chain usually runs over the wheel and inside the groove, if present...

 on the end used for the purpose of lifting. The lower portion of the jin-pole is attached to the upper exterior of an existing tower or structure

Structure

Structure is a fundamental, tangible or intangible notion referring to the recognition, observation, nature, and permanence of patterns and relationships of entities. This notion may itself be an object, such as a built structure, or an attribute, such as the structure of society...

. The jin-pole's free end extends above the existing tower or structure. When used to create a segmented tower or antenna

Antenna (radio)

An antenna is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver...

, the jin-pole can be detached, raised and re-attached to the just completed segment for the purpose of lifting the next segment. The process is repeated until the top most portion of the tower is completed.

External links

• notes & drawings
• tower contractor's description with diagram
• instructions with illustrations for erecting a jin-pole as part of a mast
• jin pole regulations in Ca.
• jin pole failure leads to lawsuit april 15, 1948 in philadelphia