Various configurations are dis- [56] References Cited closed, including some ideally suited for use with a sim- UNITED STATES PATENTS ple remote switching means. 3,202,886 8/1965 Kramer 335/254 X 19 Claims, 15 Drawing Figures f 2 1 4 i ii i 1 I i i E\ SCONDAPYCOAL r 1 3 \7 L .J 5 5 I g f g P/P/MA/Q Y 60/4 5 5 i 2 A 1 5 1 14 J 5 I -21 )4 m '-I2 l6 1 I v25 *16 i2. 3 g 2 Z (I x E 1 a E, 1 1 I 1 P/P/