Boots – shoes – and leggings – Boots and shoes – Occupational or athletic shoe
Patent
1979-12-02
1984-02-28
Nerbun, Peter P.
Boots, shoes, and leggings
Boots and shoes
Occupational or athletic shoe
36 93, 2420, A43B 504, A42B 300
Patent
active
044334940
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application corresponding to PCT/CH79/00047 filed Mar. 29, 1979 and bsed upon Swiss national application 3695/78 filed Apr. 6, 1978 under the International Convention.
FIELD OF THE INVENTION
The invention relates to an article of clothing and, more particularly, to an article which can be adapted to the human body as an accessory for participation in various sports.
BACKGROUND OF THE INVENTION
There are several articles of clothing or accessories such as ski boats and helmets, fishing boots, boxing gloves, as well as swimming flippers which have to be adapted precisely to the parts of the body for which they are intended. The problem is further aggravated when the covering is rigid, as in the case of boots for downhill skiing, or helmets, because it is impossible in practice to mold a special covering adapted to the feet or to the head of each user. Now it is known that there are virtually never two individuals having the same morphology. This is why use is generally made of paddings made of deformable material in order to adapt the covering to the part of the body to be enclosed.
If the shoes are shaped from an entirely rigid shell, as are the majority of boots intended for downhill skiing the foot has to be held as closely as possible in the boot but still remain comfortable. Since the rigid shell is molded as a function of a given size and such a molding is inevitably standard, the boot is adapted to the foot by means of intermediate padding intended to match the shape of the foot as faithfully as possible.
Various solutions have already been proposed for forming this padding. Most of these techniques use a foamed plastic having the appearance of a sock placed in the rigid shell. This sock is shaped so as to reproduce the shape of the foot internally, fairly faithfully, and the foam allows it to be adapted to the slight morphological variations which exist between various feet of similar sizes. This solution is only partially satisfactory in so far as a standard sock is intended to adapt itself to feet of substantially the same size, that is to say the same length between the heel and the tip of the toe, but of which the configurations can, however, vary quite significantly among themselves. As a result, the foot is held fairly well but the comfort is uneven.
It has been proposed that this disadvantage be overcome by the in situ molding of expanded foam which is injected in a flexible chamber in the form of a sock, placed into the rigid shell and receiving the foot to which the boot is to be adjusted. The foam fills the free spaces between the foot and the shell, faithfully matching the shape of the foot. This is a solution which is capable of giving good results. Unfortunately, it is rather awkward to carry out the process, the foam is often distributed badly and the proportion of failures is high. It is also an expensive technique since each failure increases the price. Moreover this expanded foam does not have a very high resistance to fatigue and its density is fairly high. Although this solution was very successful initially, it has gradually been abandoned because of these factors.
It has also been proposed that cushions of wax or other similar materials be injected into certain regions to improve the retention of the foot in the shell. However, cushions of this type lack elasticity. It should also be noted that the present tendency is to produce light boots which have only a single fastener and not three or four, so that it is even more important to hold the foot in the shell as closely as possible, the gripping effect produced by fasteners being substantially reduced.
Use has already been made of thermo-formable foams produced from low density polyethylene which has been blown with nitrogen, in the medical sphere, particularly for hot-molding this foam around various parts of the body in order to produce cradles or orthopaedic supports or for adapting a prosthesis to a mutilated limb. The foam is heated to its th
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patent: 3613271 (1971-10-01), Geller
patent: 3641688 (1972-02-01), Benken
patent: 3760056 (1973-09-01), Rudy
patent: 3818508 (1974-06-01), Lammers et al.
patent: 3848287 (1974-11-01), Simonsen
patent: 3977034 (1976-08-01), Brown
patent: 4108928 (1978-08-01), Swan, Jr.
Arieh Simon
Courvoisier Guy
Dubno Herbert
Lange International S.A.
Nerbun Peter P.
Ross Karl F.
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