Hand-held pivoting electric heat sealing apparatus

A hand-held electric heat sealing apparatus comprising a casing having a front end and a rear end, a compression spring mounted in the front end of said casing, a power supply circuit having a pair of metal contact plates mounted inside said casing and connected to to two opposite terminals of a power source, a heat sealing unit mounted in the front end of said casing and supported on said compression spring and moved vertically relative to said casing, a press handle having a rear end pivotally connected to the rear end of the casing and a front end mounted with a heat insulative pad adapted to press an object against said heat sealing unit for permitting it to be sealed, said heat sealing unit comprising a heat insulative base having a projecting block raised from said heat insulative base in the middle, an electric heating wire fastened to said heat insulative base, and two metal contact plates disposed at two opposite sides of said heat insulative base and connected to two opposite ends of said electric heating wire and adapted for connecting to the two metal contact plates of said power supply circuit, wherein:

• said heat sealing unit comprises a cover shell covered on the front end of said casing over said heat insulative base and having a center opening through which the projecting block of said heat insulative base projects out of said cover shell, a heat insulative sheet supported on said cover shell over its center opening and disposed in contact with the electric heating wire of said heat sealing unit, and a cover frame fastened to said cover shell to hold said heat insulative sheet in place.

A hand-held electric heat sealing apparatus comprising a casing having a front end and a rear end, a compression spring mounted in the front end of said casing, a power supply circuit having a pair of metal contact plates mounted inside said casing and connected to two opposite terminals of a power source, a heat sealing unit mounted in the front end of said casing and supported on said compression spring and moved vertically relative to said casing, a press handle having a rear end pivotally connected to the rear end of the casing and a front end mounted with a heat insulative pad adapted to press an object against said heat sealing unit for permitting it to be sealed, said heat sealing unit comprising a heat insulative base having a projecting block raised from said heat insulative base in the middle, an electric heating wire fastened to said heat insulative base, and two metal contact plates disposed at two opposite sides of said heat insulative base and connected to two opposite ends of said electric heating wire and adapted for connecting to the two metal contact plates of said power supply circuit, wherein a safety switch is mounted in the front end of said casing, and comprised of a switch lever extended out of said casing, and an electrically insulative bumper connected to said switch lever, said electrically insulative bumper being moved by said switch lever between a first position in which said electrically insulative bumper is stopped above the metal contact plates of said power supply circuit to prohibit contact of the metal contact plates of said heat sealing unit from the metal contact plates of said power supply circuit, and a second position in which said electrically insulative bumper is moved away from the metal contact plates of said power supply circuit for permitting the metal contact plates of said heat sealing unit to be forced into contact with the metal contact plates of said power supply circuit.