Tools – Tool jaw – Jaw features
Patent
1981-08-06
1984-07-24
Jones, Jr., James L.
Tools
Tool jaw
Jaw features
81302, 294 16, B25B 702
Patent
active
044611935
DESCRIPTION:
BRIEF SUMMARY
The invention relates to pliers for handling disks and other flat and thin objects, subject to scratching, pollution, contamination, or of which repeated handling presents certain risks for the fingers.
The handling of gramophone or video disks, photographic plates, printed circuits, silicon plates used for the manufacture of photovoltaic cells, microfiches, sterile or, on the contrary, contaminated objects, requires considerable precautions with a view to reducing, depending on the case, the risks of deterioration by a scratching or soiling, pollution or contamination.
Long-playing or video disks, at present proposed on the market, have become high-precision products capable of restoring sounds or images with high fidelity and a minimum of alteration. The quality of this restitution depends, of course, on the integrity and cleanliness of the disks, which obliges the users to take considerable precautions when gripping and handling, in order to avoid scratches by the finger-nails, rings or bracelets and any soiling by the fingers, as the scratches and soiling are respectively translated by "taps" and "crackling" which disturb hearing.
In the electronic, photographic and printing fields, it is mainly pollution by the acid substance secreted by the fingers which it is sought to avoid for reasons of corrosion or disturbance of the subsequent treatments.
In the biological and medical fields, the risks of bacteriological and microbial contamination, during manipulations or analyses must be eliminated. Now, the fingers, particularly at nail level, are capable of transmitting this contamination.
In the nuclear field, it is the handling of objects contaminated by radioactive particles, during decontamination operations, which exposes the operators to certain risks.
In other domains, it is the repeated handling of very rough objects such as grinding wheel disks, for example, or sheets of abrasives, which causes wear and irritation of the epidermis at the end of the fingers.
For these handlings, gloves or pliers, specially designed for these different uses, are already used.
In particular, pliers for handling disks, corresponding to the preamble of claim 1 are known (patents: French A 2 040 678 and A 2 393 653; U.S. Pat. No. 1,365,227; Belgian A 555 159; British A 1 363 773). It is respectively question of pliers: with curved noses, which enables the disk to be gripped by its edge outside the recorded surface; with flat noses covered with plastics material, which enables the disk to be gripped in the recorded zone; with long, flat noses, whose end is provided with buffers enabling the disk to be gripped by its central, non-recorded part; with flexible noses, of the tweezer type, enabling the disk to be gripped in the recorded zone; and made of flexible material of which the hinge is obtained by simple folding.
The pliers with curved noses, which enables the disk to be gripped by its edge outside the recorded surface, must be used with precaution, as a somewhat sudden handling could provoke a deformation, and even a breakage, of the edge. The pliers with flat noses covered with plastics material are equipped with arms of the scissor type, which obliges a pressure to be maintained with two fingers during the whole duration of the handling. All these pliers, with the exception of those of the tweezer type, require that a constant pressure of the hand be maintained for the whole duration of the handling, including when the side is changed, which imposes relaying this pressure with the aid of the other hand, to avoid an awkward rotation of the wrist, when turning over.
None of these pliers are equipped with a precise and permanent adjustment of the pressure exerted by the jaws, as a function of the thickness, weight and dimensions of the disk, and none have been designed to facilitate insertion of the noses in the record sleeve, nor to avoid scratching the adjacent disks with the back of the noses. The jaws are not applied against each other in rest position, this promoting the deposit of abrasive dust on their working s
REFERENCES:
patent: 3410592 (1968-11-01), Schweizer
patent: 3558169 (1971-01-01), Onanian
Gruber Alexandre
Gruber Anne B.
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