Extension coil. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Extension coil. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / electrician's tool

The extension coil consists of a base and a stand made of figured metal plates connected to each other by rivets. A bronze bushing is fixed in the rack, into which the steel axis of the coil is inserted along a sliding fit. A handle with a rotating handle is rigidly mounted on a square shank from its one end, and textolite sidewalls of the coil with a vinyl plastic spacer sleeve are mounted on the other end. The sleeve also serves to wind the wire.

All this, together with the socket box, is rigidly tightened with an M8 bolt screwed into the axle. A socket is attached to the socket with screws, from which the wire is passed through the hole and wound on a coil. A plug is attached to the other end of the wire.

Extension coil (click to enlarge): 1 - handle, 2 - washer, 3 - M6 nut, 4 - axle, 5 - sleeve, 6 - M20x1,5 nut, 7 - coil cheeks (sidewalls), 8 - socket box, 9 - plug socket, 10 - M8 bolt, 11 - M5 screw, 12 - base, 13 - leg, 14 - spacer sleeve, 15 - base stand.

Parts that require insulation are made of textolite, vinyl plastic, ebonite and polished. And the stand and base (made of stainless steel) are additionally painted with boron powder. Such processing gives the product not only the necessary strength and safety, but also an attractive presentation. The dimensions of the coil allow you to freely wind 30 m of wire of the appropriate section on it, which is quite enough for use in the household.

The proposed extension coil will not take up much space in your home or workshop; it is also convenient to carry it with you in a car - to turn on the parking light or emergency stop lamp.

Author: N.Volodartsev

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