Electric heating – Heating devices – Tool or instrument
Patent
1989-01-17
1992-03-24
Bartis, Anthony
Electric heating
Heating devices
Tool or instrument
101 8, 101 9, 101 27, 101 31, 156579, 1565831, 156DIG36, 156DIG51, 219241, 219243, 425386, 425445, H05B 102, H05B 300, B43M 100, G09F 304
Patent
active
050991060
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The object of the present invention is a device for thermosealing folders, parcels and the like. As is well known, the conventional sealing of folders, or parcels has experienced during the years several changes. From conventional sealing wax and lead seals, a wide variety of seals have been adopted, the form and the way of application of the seals being different depending on the use, the importance and the dimensions of the object to be protected, Nowadays it can be said that nearly universally adhesive tapes are employed which are completed by dry stamps which can be dry or soaked with indelible ink. In any case however, besides the required practicability and rapidity of this kind of operations, there does not yet exist an absolute certainty that the objects to be protected are free from tampering or illicit handling.
The purpose of this invention is to provide a sealing device which in addition to the easiness and practicability of use ensures an absolute certainty of the completeness of the outer cover or of the objects which are so treated. Such purpose, according to the invention, is obtained by means of an image seal hot-applied on an adhesive thermolabile tape whereby, at completion, the image of said seal printed in relief can be obtained on the surface of said tape, and the corresponding image indelibly "scorched" on the applied surface of the tape, so as to form a single body and to immediately reveal any tampering of the tape itself, when the latter is removed in a fraudulent way.
According to the invention a sealing device is provided which comprises a metal plate on which the image of the seal is reproduced, which plate is mounted at the free end of a handle and is telescopically slidable within a cylindrical tube, a thermistor intended for heating said seal-plate when switched on; means for maintaining the temperature of said plate at a substantially constant and predetermined level and an adhesive tape intended for cooperating with said seal, which tape comprises a cellulose acetate semitransparent film and a layer of colored adhesive material which is applied on that of the tape faces which is to be spread out in contact with the envelope to be protected; the colored adhesive material being intended for being "scorched" as a consequence of the action of said seal and become a single body with the envelope material, the image of said seal being indelibly reprinted on the latter.
The invention will be now described with reference to the annexed drawings which show, as an example, and not a limitation a preferred embodiment of the invention.
In the drawings:
FIG. 1 shows an exploded veiw of the device partially sectioned along an axial plane.
FIG. 2 shows a thermo-seal with the related stand and its supply cable.
With reference to FIG. 1, reference numeral 1 indicates the handle which is telescopically slidable within a sleeve means comprising a tube 2 against an opposing spring 3 mounted between these two elements, (handle and tube) and resting on shoulder 4 as shown in FIG. 2, tube 2 serves to shield heated portions of the device and as a stand for the device. A cylindrical space 5 is defined within handle 1, a block 7 being housed within space 5 by means of a pair of screws 6, which block is provided with a central bore 8. Under block 7 head 9 is located which is provided with a collar 10 that abuts against shoulder 11 of tube 2 and three through-holes one of which, indicated by 12, is center aligned with bore 8 and two other bores 13 through which tabs 14 pass. Tabs 14 comprise the electrodes connected with a supply cable 27 provided to handle 1 in the manner shown in FIG. 2 and extending through the handle to tabs 14.
Between electrodes 14 a PTC thermistor 15, namely a resistor, is located which, after reaching a predetermined temperature, automatically cuts off the power for the purpose of preventing any overheating.
A metal disk 16 is mounted in contact and between the described elements, the purpose of which is to act as a thermal stabilizer or heat accumulator as it wi
REFERENCES:
patent: 1157687 (1915-10-01), Garner et al.
patent: 1385749 (1921-07-01), Mueller
patent: 1716937 (1929-06-01), Whited
patent: 1960776 (1934-05-01), Flothow
patent: 2585504 (1952-02-01), Severance
patent: 3584190 (1971-06-01), Marcoux
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