Patent ID: 6627853
Filing Date: 2003-09-30
Classification: B29C,Y10T

Abstract:
An electric heat sealer comprising:(a) a casing defining a battery chamber, said battery chamber comprising (i) a front upright support, (iii) first and second front terminal plates respectively mounted on said front upright support, (iv) a pair of rear terminal plates respectively mounted on said rear upright support, (v) a first metal contact plate mounted on said front upright support and connected to said first front terminal plate, and (vi) a second metal contact plate mounted on said front upright support and spaced from said second terminal plate by a gap, said second terminal plate being forced into contact with said second metal contact plate when a battery set is installed in said battery chamber; (b) a spring holder mounted in said casing and spaced between said first and second metal contact plates; (c) a sealing mechanism mounted in said casing and moved up and down relative to said first and second metal contact plates, said sealing mechanism comprising (i) a heat insulative base, (ii) an electric wire, (iii) two metal locating plates, and (iv) a compression spring, said heat insulative base comprising a protrusive middle portion, said electric heating wire being mounted on said protrusive middle portion of said heat insulative base, said metal locating plates being fastened to said heat insulative base at two opposite sides thereof and respectively connected to two opposite ends of said electric heating wire, said compression spring being disposed between said spring holder and said protrusive middle portion of said heat insulative base; (d) a press bar having a fixed end pivotally connected to one end of said casing and a free end on which is mounted a heat insulative press block, said heat insulative press block being forced against said protrusive middle portion of said heat insulative base of said sealing mechanism when said press bar is depressed; and (e) a safety device, said safety device comprising a safety switch and having a first lead wire and a second lead wire, said first lead wire extending between said safety switch and said second metal contact plate and said second lead wire extending between said safety switch and said second terminal plate, said safety device selectively preventing electrical current from flowing through said electric heating wire.