DE29509119U1 - Shoe to protect against cuts with hand-held chainsaws - Google Patents

Description

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Description :

The invention relates to a shoe for protection against cuts caused by hand-held chainsaws with a protective area covering the blade, tongue and toe area, the toe area of which is completely covered by a safety toe cap made of metal or plastic.

A known shoe of this type according to the European standard prEN 344, Part 2, Sept. 1994, Clause 4.3.3 requires a safety shoe whose protective area covers the vamp, tongue and toe area of the shoe. This protective area includes the safety toe cap on the one hand and extends on the other hand from the rear edge of the toe cap to two vertical lines of 70 mm on either side of the center line of the shoe, measured from a point that is vertically no more than 10 mm above the heel edge to 195 mm above the insole. The latter dimension is measured from the top edge of the insole in the middle of the heel area. The heel edge is understood to be the line of the shoe where the upper part of the shoe meets the

The shoe bottom is the
The corresponding part of the shoe bottom can be the welt, the edge or the sole, depending on the design of the shoe.
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Depending on whether such a shoe is protected against cuts by hand-held chainsaws with a

Chain speed of 16 m/sec., 20 m/sec., 24 m/sec. or 28 m/sec. is suitable, a distinction is made between the
corresponding shoe class with the Arabic numerals 0, 1, 2 and 3.

In DE-OS 26 09 782 a shoe is disclosed which, in addition to a safety toe cap made of metal in the

The blade area has a central foot cap made of metal or a suitably resistant
plastic, which is attached via a joint with rivets near the rear edge of the toe cap. This metatarsal cap is certainly suitable for protecting the metatarsal area of the user against impacts or

As protection against cuts by chainsaws, however, such a metatarsal cap is
unsuitable, whether the hard metal or plastic exerting the corresponding reaction forces is caught directly by the blades of the chainsaw and
be splintered or the saw teeth get under the
Grip the edge areas and the metatarsal cap
A pad underneath the metatarsal cap does not change this, because the teeth of a

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Chainsaw can come into direct contact with the metal. For example, tests with a titanium cap have shown that such a cap was sawed cleanly and splintered by the chainsaw blades. 5

Furthermore, a shoe is known from DE-OS 24 26 727 in which an upper leather is attached to the steel toe cap. The upper leather runs, forming a cavity, beneath a metatarsal protection made of tough-elastic plastic. There is an elastic insert between the metatarsal protection and the upper leather. In this shoe too, the metatarsal protection made of tough-elastic plastic is merely a relatively rigid extension of the safety toe cap, which is unsuitable for protection against cuts from chainsaws because it offers too rigid a resistance to the blades of a chainsaw, does not evade them and is thus cut straight through and torn to pieces by the chainsaw. In addition, in areas of plastics of this or similar types, the water vapor absorption capacity and
Water vapor permeability is impaired accordingly.

Based on this state of the art, the invention is based on the task of creating a shoe of the type mentioned at the beginning, which on the one hand ensures protection against cuts from chainsaws with a chain speed of up to 20 m/sec. and on the other hand is capable of absorbing water vapor and

is permeable to water vapor. Such shoes are mainly needed in forestry and agriculture.

This task is solved according to the invention in connection with the generic term mentioned at the beginning in that the shoe has an inner shaft and an outer shaft in its vamp and tongue area, whereby the upper material of both shafts and the tongue consists of a chrome-tanned leather and a layer of an entropy-elastic plastic is arranged between this upper material and an inner lining in the outer shaft and the tongue. The composition of these two completely different materials, namely a chrome-tanned leather on the one hand and a layer of an entropy-elastic plastic underneath, leads to the following surprising effect:

Chrome-tanned leather is relatively soft on the one hand, but on the other hand it is considerably more cut-resistant than, for example, vegetable-tanned leather. Thanks to the layer of entropy-elastic plastic underneath, both the upper material and the entropy-elastic plastic dodge a blow or impact from a chainsaw and are only caught by the teeth of the chainsaw after they spring back. In one test, however, this only caught the outer shaft, whereas the inner shaft was only slightly scratched. The tongue remained completely undamaged. Thanks to the

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In the structure according to the invention, the foot or leg of the user is protected in the toe area by the well-known safety toe cap made of metal or plastic as well as a layer of chrome-tanned leather covering this and the layer of entropy-elastic plastic underneath. The blade area adjacent to the rear edge of the safety toe cap is protected by a total of three layer structures, namely on the one hand by the outer shaft, on the other hand by the inner shaft and finally by the tab or tongue, which has the same material structure as the outer shaft.

To ensure a desired water vapor absorption capacity and

Water vapor permeability, the layer of an entropy-elastic plastic is advantageously replaced by an open-cell foam, in particular one made of polyether foam with a specific weight of

46 kg/m ³ formed.

To further increase safety, a layer of highly tear-resistant material is placed between the upper material and the inner lining of the two shafts as well as the inner lining of the tongue. This highly tear-resistant material preferably consists of either a fabric of aramid fibers (poly(l,4-phenylene terephthalamide) with high stretch resistance, great strength and flexibility or a glass fiber reinforced plastic

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and/or metal mesh, preferably one made of stainless steel. The mesh according to the first alternative design is known under the trademark name "Kevlar" and has proven itself many times in the aircraft and tire industries. According to the second alternative design, however, a highly tear-resistant layer made of glass fiber reinforced plastic and/or metal mesh is also advantageous. This creates either a plastic mesh or a metal mesh, or as a third alternative, plastic fibers can be woven together with metal fibers.

This sandwich-like structure of upper leather, tear-resistant material, entropy-elastic plastic, lining material, and the arrangement of these layers in at least two copies in the vamp area of the outer shaft and tongue area creates a shoe that would have protected the user from injury at a chain speed of 20 m/s according to shoe class 1 of Suropa Standard 344, Part 2. Such a shoe is unknown to date.

Alternatively, instead of the foam or as an additional layer above the lining material, another layer of felt or a random fiber material with corresponding elasticity and strength properties is arranged.

In order to achieve the most extensive protection possible in the vamp area, the inner shaft is connected to the end of the outer shaft on both sides at the end of its protective area via a zip fastener and the outer shaft is provided with a Velcro fastener that overlaps the zip fasteners. This not only creates a protective zone that goes beyond the protective area required by the standards, but also creates a visually appealing shoe. The latter is important because unsightly or uncomfortable safety shoes are all too often not worn.

In order to create at least a triple layer of safety near the safety toe cap, the tab extends to the rear edge of the safety toe cap, whereby the inner shaft above the tab can be closed with lacing.
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Further advantageous features of the invention can be found in the claims and are described below with reference to the drawings. In the drawings:

Fig. 1 a longitudinal section through a shoe with different hatching of the individual layers and

Fig. 2 is an enlarged sectional view taken along the line III-III of Fig. 1.

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According to Fig. 1, the shoe 1 for protection against cuts by hand-held chainsaws consists in its blade area 2 and its tongue area 3 of an inner shaft 4 and an outer shaft 6 extending approximately to both sides of the center line 5 of the inner shaft 4, as well as a tongue 7, which covers an open part of the inner shaft 4 that can be laced up. The center line 5 represents approximately the end of the protective area of the outer shaft 6 and the inner shaft 4.

In the exemplary embodiment, the material structure of the outer shaft 6 and the tongue 7 is identical, namely in such a way that under the upper material 8 made of chrome-tanned leather there is a layer 9 made of highly tear-resistant material, below that a layer 10 made of an entropy-elastic plastic, namely an open-cell foam, in particular one made of polyether foam, and then the inner lining 11.

In contrast, the structure of the inner shaft from outside to inside is also characterized by an upper material 8 made of chrome-tanned leather, then by a layer 9 made of highly tear-resistant material and then by the inner lining 11. However, it is also possible to design the layer structure of the inner shaft 4 in the same way as the layer structure of the outer shaft 6 and the tongue 7.

The layer 9 made of high-tear strength material advantageously consists of a fabric of aramid fibers (poly(1,4-phenylene terephthalamide) with high tensile strength, great strength and flexibility, which is known under the trademark "Kevlar". As a further alternative, it is possible to produce the layer 9 made of high-tear strength material as a fabric made of glass fiber reinforced plastic or metal fabric or a mixed fabric of glass fiber reinforced plastic fibers and metal fibers.

Advantageously, instead of the layer 10 made of foam, a further layer made of felt or a random fiber material is arranged as an additional layer above the lining material 11.

The toe area 12 is covered in a known manner by a safety toe cap 13 made of metal. The safety toe cap 13 is overlapped on its upper side by the upper material 8 made of chrome-tanned leather and in the front toe area by a layer 14 of the outsole 15 made of foamed mono-polyurethane foam or a vulcanized mono-nitrile sole 15. This overlap is also present all the way around on both side edges, as shown in Fig. 2.

As can be seen in particular from Figures 1 and 2, the tab 7 extends in its lower part 7a to the rear edge 13a of the safety toe cap 13

whereby in this area 16 a three-layer protective layer is provided from the layers 8, 9, 10, 11 of the . outer shaft 6 as well as the protective layers 8, 9, 11 of the inner shaft 4 as well as the protective layers 8, 9, 10, 11 of the tab 7.

The insole 17 is made of vegetable tanned leather, while the inner lining 11 of the inner shaft 4, the outer shaft 6 and the tongue 7 is made of split leather.

The heel area 18 is surrounded by a layer 19 of the outsole 15, similar to the area of the safety toe cap 13. In addition, a layer 20 made of reader fiber material is arranged between the upper material 8 and the inner lining 11 of the rear cap in the heel area.

The safety function of this shoe 1 according to the invention is surprisingly based on the fact that - similar to the effect of a cutting knife on a relatively soft and thus flexible tomato - the relatively soft upper material 8 made of chrome-tanned leather springs back under the effect of the entropy-elastic foam layer 10 of the outer shaft 6 and the tongue 7 when struck by the chain of a chainsaw, whereby the blades of the chain slide over the relatively soft but cut-resistant upper material made of chrome-tanned leather before they

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cut. During this process, the entropy-elastic layer 10, which acts as an energy storage device, caused the upper material 8 to spring back, whereby the cutting chain teeth from the foot 3 were pushed back over the upper material 8 to the greatest possible distance during the cut. Tests have shown that although the outer shaft 6 could be cut open and the inner shaft 4 could be scratched at the relevant point underneath, the tab 7 remained completely undamaged.

It was also surprising to find that metallic protective materials, e.g. chain gloves, incorporated into both the outer shaft 6 and the inner shaft 4 were cut cleanly through by the chain saw. Based on these facts, it can be concluded that the structure according to the invention, consisting of a soft but relatively cut-resistant upper material made of chrome-tanned leather in combination with a 0 entropy-elastic layer 10 made of foam, avoids the devastating effect of the chain saw by giving in elastically. It should not be overlooked that numerous impact-resistant and/or tough materials, in particular those made of plastics or titanium, are not suitable because titanium is splintered by the chain saw like glass, and numerous plastics do not have the water vapor absorption capacity or water vapor permeability required for breathability. Furthermore,

must be taken into account that such a shoe, even if it has been designed for safety reasons, must offer the wearer a certain level of walking comfort and an attractive appearance, otherwise it will not be worn.

In the sectional view of Fig. 2 it can be seen that, from the outside to the inside, in this particularly vulnerable area, an upper material 8 made of chrome-tanned leather, a layer 9 made of highly tear-resistant material and, underneath, a layer 10 made of an entropy-elastic plastic are arranged. This is followed by an air gap and the edge 13a of the safety toe cap 13, which can be seen in the background. This is followed by the three layers of the tongue area 3, namely an upper material 8 made of chrome-tanned leather, a layer 9 made of highly tear-resistant material and the inner lining 11. Both the air layer 21 at this point and the remaining air gap 22 (see Fig. 1) between the outer shaft 6 and the inner shaft 4 ensure an air pump effect when the shoe is worn, which occurs when the sole 15 rolls over the toe area 12 as the user walks through a milling process of the materials. This means that all breathable layers 8, 9, 10, 11 are well ventilated and, due to their water vapor absorption capacity and water vapor permeability, moisture build-up as a result of foot perspiration processes is prevented.

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List of reference symbols

Shoe 1 5

Leaf area 2

Tab area 3

Inner shaft 4

Centerline of the inner shaft 4 5

AujSenschaft 6 15

Tab 7

lower part of the tab 7 7a

Upper material 8

Layer of highly tear-resistant material 9,

Layer of entropy-elastic plastic 10

Lining 11

Toe area 12

Safety toe cap 13

Layer of

Mono polyurethane foam 14,

Trailing edge of the

Safety toe cap 13 13a

Au/Sensole 15

Area between the lower

Part 7a and the trailing edge 13a 16

Insole 17

Heel area 18

Layer of reader fiber 20 20

Air layer 21

Air gap 22 25

Claims (11)

Protection claims: 1. Shoe for protection against cuts caused by hand-held chain saws with a protective area covering the blade, tongue and toe area, the toe area of which is completely covered by a safety toe cap made of metal or plastic, characterized in that the shoe (1) has an inner shaft (4) and an outer shaft (6) in its blade (2) and tongue area (3), the upper material (8) of both shafts (4, 6) and the tongue (7) consisting of a chrome-tanned leather and a layer (10) made of an entropy-elastic plastic is arranged between this upper material (8) and an inner lining (11) in the outer shaft (6) and the tongue (7). 2. Shoe according to claim 1, characterized in that the layer (10) made of an entropy-elastic plastic is formed from an open-cell foam, in particular a polyether foam with a specific weight of 46 kg/m. Page 17 .*%,". ,··. 3&Lgr;. 05-19&S« 3. Shoe according to claims 1 and 2,
characterized by/3
between the upper material (8) and the inner lining (11) of the two shafts (4, 6) and the tongue (7) a Layer (9) made of high-purity material is arranged. 4. Shoe according to claim 3, characterized
characterized in that the layer (9) of high-strength material consists of a fabric of Aramid fibres (poly(1,4-phenyleneterephthalamide) with high tensile strength, high strength and flexibility or a glass fibre reinforced plastic and/or
metal mesh. 5. Shoe according to one or more of claims 1 to 4, characterized in that the material structure for the inner shaft (4) of the
the same as that of the outer shaft (6). 6. Shoe according to one or more of claims 1 to 5, characterized in that instead of the layer (10) made of foam or as an additional layer above the inner lining (11) another layer made of felt or a random fiber material is arranged. : : .*.: ipiv— " 7. Shoe according to one or more of claims 1 to 6, characterized in that the inner shaft (4) is connected on both sides at the end of its protective area (line 5) to the end of the outer shaft (6) via a zipper and the outer shaft (6) completely covering the inner shaft (4) in its vamp (2) and tongue area (3) is provided with a Velcro fastener overlapping the zippers.
10 8. Shoe according to one or more of claims 1 to 7, characterized in that the tab (tongue) (7) extends to the rear edge (13a) of the safety toe cap (13), and the inner shaft (4) can be closed above the tab (7) by means of lacing. 9. Shoe according to one or more of claims 1 to 8, characterized in that it is provided with a profiled sole (15) made of foamed mono-polyurethane foam or with a vulcanized mono-nitrile sole. 10. Shoe according to one or more of claims 1 to 9, characterized in that the insole (17) consists of a vegetable tanned leather and the inner lining (11) consists of split leather. Page 19 *· ·» ·· 2&.05·&Igr;9&Agr;5. 11. Shoe according to one or more of claims 1 to 10, characterized in that a layer (20) of cellulose fiber is arranged between the upper material (8) and the inner lining (11) of the rear cap (18) in the heel area.