The invention relates to coils and has particular application to wound bobbin coil apparatus typically used in small electric motors.
Wound bobbins are widely used in the fabrication of small electric motors. The bobbins are typically automatically wound, by various types of machinery, with relatively small copper wire. Such copper wire typically is provided with only a varnish type insulation. The wires are provided with extensions or "terminations" which are typically multistrand wires having a substantially greater outside diameter and having conventional insulation disposed over most of the axial extent thereof. Such terminations are necessary to provide durability which would not be possible with the relatively fragile wire which is used for the windings of the coil itself.
The prior art techniques for providing such terminations commonly include the utilization of a so-called "saddle" which holds the terminations (typically two in number) while the various connections are made. While the prior art method has been widely used it does not appear to offer the maximum efficiency.
It is an object of the invention to provide a coil construction which will be extremely durable and which more specifically, will provide substantial strain relief for the terminations.
It is another object of the invention to provide a construction which will require substantially less labor than is necessary to assemble apparatus of a more conventional design.
Yet another object of the invention is to provide apparatus which can be manufactured at a relatively low cost both for labor and material.