GB2055549A

GB2055549A - Safety shoe

Info

Publication number: GB2055549A
Application number: GB8022801A
Authority: GB
Original assignee: Schiermeister & Junker
Current assignee: Schiermeister & Junker
Priority date: 1979-08-14
Filing date: 1980-07-11
Publication date: 1981-03-11
Also published as: BE884770A; NL8004594A; IT8023619A0; FR2462881B3; DE7923205U1; FR2462881A1; IT1131970B

Abstract

A safety shoe comprises an integral upper (1), inner sole (2) and flange (3) extending all around the edge of the inner sole, and further comprises an outer sole (6) and steel sole (5) embedded between the soles and at least frictionally engaged by the flange (3), undercut at (4). The plate is held in position on the inner sole (2) by the flange (3) whilst the outer sole is sprayed or moulded on. The upper, and inner and outer soles may be made of plastics. Instead of the flange (3), studs moulded over the surface of the inner sole may engage a perforate steel plate, or projections adjacent the edge of the inner sole may co-operate with edge recesses in the steel sole. <IMAGE>

Description

SPECIFICATION Safety shoe The invention relates to a safety shoe, the upper of which is made in one piece with the inner sole by plastics moulding, particularly by injection moulding of plastics material or other materials having similar properties, and the outer sole of which is formed in a second plastics moulding operation, a steel sole being embedded between the said two soles.

In this connection it is necessary that the steel sole, which is similar in shape to the first sole and which is smaller than the outer sole, is embedded equidistantly from the edges of the inner and the outer sole, over its entire periphery.

This requirement has hitherto been met, in the moulding tool in which the outer sole is moulded onto the inner sole which, together with the upper, forms a unit, by providing a plurality of retaining pins on which is mounted the steel sole having correspondingly arranged and shaped perforations in order to secure the steel sole in the correct position biih in the mould and relative to the first sole, during the plastics moulding operation.

However, the retaining pins produce corresponding holes in the finished outer sole. Moreover, the arrangement of the retaining pins renders the manufacture of both the moulding and the safety shoe more costly.

An object of the present invention is to enable a continuous outer sole to be obtained by very simple means and at low cost for a safety shoe of the type described hereinbefore.

The solution to this problem is characterised by the provision of adjusting projections which are formed on the first sole made integral with the upper and which are arranged so as to be at least frictionally engaged on the steel sole.

Accordingly, the invention provides a safety shoe comprising an upper, an inner sole integral with the upper, an outer sole, a steel member embedded between said inner and outer soles and adjustable projection means integral with the inner sole and adapted to at least frictionally engage the steel member. Preferably the steel member comprises a sole-shaped steel plate.

As a result, the steel sole S now secured in the correct position for moulding the outer sole to the inner sole, which is prefabricated with the upper, so that the retaining pins which had to be provided hitherto in the moulding tool are no longer required.

The projection means may comprise a flange projecting downwardly from the edge of the inner sole and extending around the entire periphery of the inner sole, the steel plate being inserted in the space enclosed by the flange which positively engages the steel plate. In this embodiment, the flange may have a height greater than the thickness of the steel plate, the flange projecting downwardly beyond the inserted steel plate, and the outer sole extending into said space. Preferably, the inner surface of the downwardly projecting flange is undercut, the steel plate being snap-fitted into said space.

In a further embodiment, the projection means comprise a plurality of studs which are distributed over the surface of the inner sole, are molded thereon and engage in holes in the steel plate which is perforate, the holes being adapted to co-operate with the said studs.

In a further embodiment, the inner sole comprises a plurality of moulded-on projections which are arranged close to its edge and distributed around the periphery, the steel plate being inserted between the projections so as to be laterally supported and at least frictionally engaged thereon. Suitably, the steel plate comprises outwardly open, spaced recesses around its periphery, the recesses being adapted to co-operate with said projections.

By this means, the perforations which were hitherto necessery in the steel sole can also be omitted.

The upper, inner sole and projection means are preferably made of plastics material and formed in a moulding, such as an injection moulding, operation.

The outer sole is preferably also made of plastics material and is bonded to the steel plate and to a part of the upper adjacent the steel plate. The outer sole may be formed by spraying or moulding.

Embodiments of the invention will now be described by way of example only, and with reference to the Figure of the accompanying drawing, which shows a cross-section of a safety shoe in accordance with the present invention.

A safety shoe comprises an upper 1 integral with an inner sole 2. A downwardly depending bracing flange 3 is moulded with the edge of the inner sole 2, and extends around the entire periphery of the inner sole 2. The flange 3 is made of plastics material and formed so as to be integral with the inner sole 2 and upper 1, the inner surface 4 of the said flange 3 being undercut.

A steel sole-shaped plate 5, which is supported on the underside of the inner sole 2 by fitting into the spaced defined and surrounded by the flange 3, the edge portions of the said steel plate engaging positively on the undercut surface 4 of the flange 3.

An outer sole 6, which is also made of plastics material, is sprayed onto the steel plate 5, the edge portions 7 of the said outer sole 6 positively enclosing the flange 3 surrounding the steel plate 5 and being connected so as to be bonded with the latter and with adjacent parts of the upper 1.

Instead of the flange 3, studs may be provided on the underside of the inner sole, these studs being moulded with the inner sole and the upper, and being adapted to co-operate with holes in a perforated steel plate, so that the steel plate is held in position relative to the inner sole whilst moulding the outer sole 6.

In yet another embodiment, one which avoids the need for a perforate steel plate, the latter is held on the inner sole by its edge frictionally engaging projections moulded on the inner sole adjacent its periphery. The steel plate may have in its edge a plurality of spaced recesses, open towards the edge of the plate and which cooperate with the projections on the inner sole.

1. A safety shoe comprising an upper, an upper

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Safety shoe The invention relates to a safety shoe, the upper of which is made in one piece with the inner sole by plastics moulding, particularly by injection moulding of plastics material or other materials having similar properties, and the outer sole of which is formed in a second plastics moulding operation, a steel sole being embedded between the said two soles. In this connection it is necessary that the steel sole, which is similar in shape to the first sole and which is smaller than the outer sole, is embedded equidistantly from the edges of the inner and the outer sole, over its entire periphery. This requirement has hitherto been met, in the moulding tool in which the outer sole is moulded onto the inner sole which, together with the upper, forms a unit, by providing a plurality of retaining pins on which is mounted the steel sole having correspondingly arranged and shaped perforations in order to secure the steel sole in the correct position biih in the mould and relative to the first sole, during the plastics moulding operation. However, the retaining pins produce corresponding holes in the finished outer sole. Moreover, the arrangement of the retaining pins renders the manufacture of both the moulding and the safety shoe more costly. An object of the present invention is to enable a continuous outer sole to be obtained by very simple means and at low cost for a safety shoe of the type described hereinbefore. The solution to this problem is characterised by the provision of adjusting projections which are formed on the first sole made integral with the upper and which are arranged so as to be at least frictionally engaged on the steel sole. Accordingly, the invention provides a safety shoe comprising an upper, an inner sole integral with the upper, an outer sole, a steel member embedded between said inner and outer soles and adjustable projection means integral with the inner sole and adapted to at least frictionally engage the steel member. Preferably the steel member comprises a sole-shaped steel plate. As a result, the steel sole S now secured in the correct position for moulding the outer sole to the inner sole, which is prefabricated with the upper, so that the retaining pins which had to be provided hitherto in the moulding tool are no longer required. The projection means may comprise a flange projecting downwardly from the edge of the inner sole and extending around the entire periphery of the inner sole, the steel plate being inserted in the space enclosed by the flange which positively engages the steel plate. In this embodiment, the flange may have a height greater than the thickness of the steel plate, the flange projecting downwardly beyond the inserted steel plate, and the outer sole extending into said space. Preferably, the inner surface of the downwardly projecting flange is undercut, the steel plate being snap-fitted into said space. In a further embodiment, the projection means comprise a plurality of studs which are distributed over the surface of the inner sole, are molded thereon and engage in holes in the steel plate which is perforate, the holes being adapted to co-operate with the said studs. In a further embodiment, the inner sole comprises a plurality of moulded-on projections which are arranged close to its edge and distributed around the periphery, the steel plate being inserted between the projections so as to be laterally supported and at least frictionally engaged thereon. Suitably, the steel plate comprises outwardly open, spaced recesses around its periphery, the recesses being adapted to co-operate with said projections. By this means, the perforations which were hitherto necessery in the steel sole can also be omitted. The upper, inner sole and projection means are preferably made of plastics material and formed in a moulding, such as an injection moulding, operation. The outer sole is preferably also made of plastics material and is bonded to the steel plate and to a part of the upper adjacent the steel plate. The outer sole may be formed by spraying or moulding. Embodiments of the invention will now be described by way of example only, and with reference to the Figure of the accompanying drawing, which shows a cross-section of a safety shoe in accordance with the present invention. A safety shoe comprises an upper 1 integral with an inner sole 2. A downwardly depending bracing flange 3 is moulded with the edge of the inner sole 2, and extends around the entire periphery of the inner sole 2. The flange 3 is made of plastics material and formed so as to be integral with the inner sole 2 and upper 1, the inner surface 4 of the said flange 3 being undercut. A steel sole-shaped plate 5, which is supported on the underside of the inner sole 2 by fitting into the spaced defined and surrounded by the flange 3, the edge portions of the said steel plate engaging positively on the undercut surface 4 of the flange 3. An outer sole 6, which is also made of plastics material, is sprayed onto the steel plate 5, the edge portions 7 of the said outer sole 6 positively enclosing the flange 3 surrounding the steel plate 5 and being connected so as to be bonded with the latter and with adjacent parts of the upper 1. Instead of the flange 3, studs may be provided on the underside of the inner sole, these studs being moulded with the inner sole and the upper, and being adapted to co-operate with holes in a perforated steel plate, so that the steel plate is held in position relative to the inner sole whilst moulding the outer sole 6. In yet another embodiment, one which avoids the need for a perforate steel plate, the latter is held on the inner sole by its edge frictionally engaging projections moulded on the inner sole adjacent its periphery. The steel plate may have in its edge a plurality of spaced recesses, open towards the edge of the plate and which cooperate with the projections on the inner sole. CLAIMS

1. A safety shoe comprising an upper, an upper sole integral with the upper, an outer sole, a steel member embedded between said inner and outer soles and adjustable projection means integral with the inner sole and adapted to at least frictionally engage the steel member.

2. A safety shoe as claimed in Claim 1, wherein said steel member comprises a steel plate.

3. A safety shoe as claimed in Claim 2, wherein the steel plate is sole shaped.

4. A safety shoe as claimed in Claim 2 or 3, wherein said projection means comprises a flange projecting downwardly from the edge of the inner sole and extending around the entire periphery of the inner sole, the steel plate being inserted in the space enclosed by the flange, which positively engages the steel plate.

5. A safety shoe as claimed in Claim 4, wherein the height of the flange is greater than the thickness of the steel plate, the flange projecting downwardly beyond the inserted steel plate, and the outer sole extending into said space.

6. A safety shoe as claimed in Claim 4 or 5, wherein the inner surface of the downwardly projecting flange is undercut, the steel plate being snapfitted into said space.

7. A safety shoe as claimed in any of Claims 1 to 3, wherein the projection means comprises a plurality of studs distributed over the surface of the inner sole, and the steel member is perforated, the studs being adapted to co-operate with holes in the perforate steel member.

8. A safety shoe as claimed in any of Claims 1 to 3, wherein the projection means comprises a plural ity of projections disposed adjacent the periphery of the inner sole.

9. A safety shoe as claimed in Claim 8, wherein the steel plate comprises a plurality of spaced, outwardly open, recesses disposed around its periphery, which recesses are adapted to co-operate with said projections.

10. A safety shoe as claimed in any preceding claim, wherein said upper, inner sole and adjustable projection means are made of plastics material.

11. A safety shoe as claimed in any preceding claim, wherein said upper, inner sole and adjustable projection means are formed by moulding.

12. A safety shoe as claimed in Claim 11, wherein said upper, inner sole and adjustable projection means are formed by injection moulding.

13. A safety shoe as claimed in any preceding claim, wherein said outer sole is made of plastics material.

14. A saftey shoe as claimed in any preceding claim, wherein said outer sole is bonded to the steel plate and to part of the upper adjacent the steel plate.

15. A safety shoe as claimed in Claim 13 or 14, wherein the outer sole is formed by spraying.

16. A safety shoe as claimed in Claim 13 or 14, wherein the outer sole is formed by moulding.

17. A safety shoe as hereinbefore described with reference to and as illustrated in the accompanying drawing.