Electric heating – Metal heating – Of cylinders
Patent
1982-12-14
1984-12-11
Leung, P. H.
Electric heating
Metal heating
Of cylinders
219 1053, 219 1073, 219 1077, 1563804, H05B 650, H05B 654
Patent
active
044880286
ABSTRACT:
A pair of jaws moveable with respect to one another whether mounted in a hand held sealer or desk mounted sealer, compresses, heats, elongates, spreads and welds liquid filled tubing placed therebetween. Variants of the pair of jaws provide means for serially or simultaneously segmenting the tubing into a plurality of sealed compartments. The pair of jaws are electrically connected to a source of RF energy as the plates of a variable capacitor in an RF resonant circuit. The flow of RF energy across the pair of jaws, which energy heats the tubing and, in conjunction with mechanical pressure, makes the weld, is a function of timing and of the spacing between the jaws which spacing affects the degree of resonance of the RF resonant circuit. Simultaneous with the heating of the tubing, the configuration of the pair of jaws compresses the tubing placed therebetween and focuses the RF energy in a narrow swath across the tubing while simultaneously elongating and spreading the tubing at the swath to obtain a leak free weld, which weld is configured to provide for separation of the sealed compartments without tearing or rupturing the compartments.
REFERENCES:
patent: 1206656 (1916-11-01), Benedictus
patent: 2587175 (1952-02-01), Lappin
patent: 2647983 (1953-08-01), Boyd
patent: 3541420 (1970-11-01), Rees
patent: 3562668 (1971-02-01), Bartlett et al.
patent: 3671709 (1972-06-01), Gidge
patent: 4013860 (1977-03-01), Hosterman et al.
patent: 4186292 (1980-01-01), Acker
Acker Loren C.
Minney Stephen C.
Taylor Junius E.
Engineering & Research Associates, Inc.
Leung P. H.
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