| 1. | A thermosealing device, characterized by the fact of comprising a metal seal carried by a handle and electrically heated at a predetermined temperature, a means for maintaining constant the seal temperature and a thermolabile adhesive tape, intended for cooperating with said seal for obtaining a printed image on the upper face of the tape and a copy of the seal image indelibly transferred on the surface on which said tape is applied. |
| 2. | A device as claimed in claim 1 characterized by the fact that said seal is heated through a thermistor which cooperates with a metal disk at contact with the seal and functions as a heat accumulator. |
| 3. | A device as claimed in claims 1 and 2 characterized by the fact that said seal is mounted inside a knurled nut which is screwed on a body slidable along the inside of a cylindrical tube and connected with a handle. |
| 4. | A device according to claims 13 characterized by the fact that the adhesive tape comprises a cellulose acetate strip which carries on one of its faces a layer of colored adhesive material of which the thermolabile characteristic are in relation with the thermal level of the seal. |
| 5. | A device for sealing any folders, parcels and the like by means of hot printing on a thermolabile tape according to claims 14 substantially as described and illustrated. |
DESCRIPTION
The object of the present invention is a device for thermosealing folders, parcels .and the like. As well known the conventional sealing of folders, or parcels experienced during the years several changes, the most of which in a modern style: from the conventional sealing wax and from the lead seals a certain variety of seals have been adopted, the form and the way of application of the seals having been perceptively different depending on the use, the importance and the dimensions of the object to be protected. Nowadays it can be said that nearly universally the 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 make a sealing device which in addition to the easiness and practicability of use ensures an absolute certainty of the completeness of the enter 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 finished operation, 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 fraudolent 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 and 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 at contact with the envelope to be protected; said colored adhesive material being intended for being "schorced" as a consequence of the action of saϊd 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 view 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 figure 1 reference 1 indicates the handle which is telescopically slidable within a tube 2 against an opposing spring 3 mounted between these two elements, (handle and tube) and resting on shoulder 4. 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 5 -holes one of which, indicated by 12, pertains to the 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.
Between electrodes 14 a thermistor 15 namely a 10 resistor is located which, after reaching a predeterminal temperature, automatically cuts off the power with the purpose of preventing any overheating.
A metal disk 16 is mounted at contact between the described elements the purpose of which is to act as a 15 thermal stabilizer or heat accumulator as it will be better explained in the following. All the above elements are attached to block 7 by means of screw 17 which fits into the center bore 8 of block 7.
With the heat accumulator 16 a plate 18 is at 20 contact on which the seal is impressed. The latter at its turn is fitted in a knurled nut 19 with the interposition of a sealing ring 20. Knurled nut 19 at its turn has an inner thread 21 which screws on the outer screw 22 of head 9. 25 From the preceding passage it evidently appears that by inscrewing nut 19 it is possible to readily exchange seal 18 and to disassemble the whole fixture.
The device up to now described is intended for being employed in cooperation with a particular type of 30 adhesive tape consisting of a cellulose acetate semitrans¬ parent film having the shape of a tape which carries on one of its faces a layer of adhesive material having a colored
pigment and having particular characteristics of thermo- lability correlated with the rated temperature predetermin¬ ed for the seal .
The device operation is as follows: plate -seal 18 is heated by means of thermistor 15 up to the predetermined temperature at which the circuit is shut off by the same thermistor. Heat accumulator 16 which during the initial step has been heated, transmits heat to seal 18 whenever the latter would become cold due to the supply cutoff whereby practically the seal preserves a thermal level which is substantially constant.
The above described adhesive tape is applied on the object to be sealed, and thereafter at the proper points of the envelope the warm seal is impressed the same way as a usual stamp. The seal image is impressed on the outer face ot the tape (the same way as by a usual dry stamp) and furthermore th ' e colored adhesive layer, which is "schorch- ed" by the seal, reproduces on the object to be sealed the image itself. This colored imprint is indelible even if the transparent layer is accurately removed. From the above it clearly appears the absolute certainty of freedom from tampering.
The apparatus, as a whole, can have the shape shown in figure 2. A block stand 23 can be provided which in its form and dimensions imitates the conventional pad but it is provided with a control switch 24 and with a possible warming lamp, for the apparatus operation.. From block 23 a supply cable 25 issues which is provided with a plug 26 and a connecting cable 27. The present invention has been illustrated and described in a preferred embodiment thereof; however it is clear that a number of structural changes can be practical-
ly introduced in it without departing from the executive scope of the present invention.
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