GB2053085A

GB2053085A - Production of hollow moulded parts

Info

Publication number: GB2053085A
Application number: GB8016144A
Authority: GB
Original assignee: Metzeler Kautschuk GmbH; Metzeler Kautschuk AG
Current assignee: Metzeler Kautschuk GmbH; Metzeler Kautschuk AG
Priority date: 1979-05-15
Filing date: 1980-05-15
Publication date: 1981-02-04
Also published as: ES490864A0; ES8100965A1; IT8021183A0; JPS55154143A; ATA172480A; AT369693B; IT1140908B; FR2456607A1; DE2919470A1

Abstract

A part for an inflatable boat is produced from gummed fabric webs 1 bonded together at a joining edge, except for an end region, in an air-tight manner using a tape 4 which is gummed on both sides and positioned between the webs. The moulded part thus produced is then turned inside out and the end region is sealed from outside. After bonding by the tape but prior to the part being turned inside out, the web edges may be reinforced by stitching. The end region may be sealed by stitching and covering by a tape. <IMAGE>

Description

SPECIFICATION A method for the production of hollow moulded parts, for example for the construction of inflatable boats The present invention relates to a method for the production of hollow moulded parts from gummed fabric webs, for example for the production of parts for inflatable boats.

It is known to produce boat parts for inflatable boats using fabric webs, which are gummed on two sides corresponding to the shape of parts to be produced, and sealed together in an air-tight manner by a so-called folded diagonal tape which is glued between the fabric webs over the entire seam so that the two webs are joined together in an undetachable manner to produce an air-tight sealed-off hollow moulded body.

A disadvantage of these moulded parts is the fact that in the joining region between the two webs, in spite of the air-tight join using a folded diagonal tape, an edge, a so-called beard, or, where the edges of the webs have been additionally sewn, a beard seam is visi ble.

This seam not only spoils the appearance of the individual moulded parts, but also impairs its function, since a beard or beard seam is disturbing when sitting on the corresponding moulded part as well as preventing other objects from being set down. There is also the danger that the parts joined together can be torn apart at the projecting edges.

The object of the invention is to provide a method in which the beard or the beard seam becomes invisible at the corresponding moulded parts of the boat without necessitating a particular treatment for the edges and in which the production method used hitherto may be substantially retained.

According to the invention there is provided a method for the production of hollow moulded parts from gummed fabric webs, wherein the gummed fabric webs are bonded together at a joining edge, except for an end region, using a tape gummed on both sides and positioned between the webs, and the moulded parts are then turned inside out and the end region is sealed from outside.

In the method of the invention, as applied to the production of boat parts, the webs to be joined together are therefore positioned with the faces which are subsequently to be outside on the inside. As in previous methods, a diagonal angular tape is then inserted along the edge, but, in contrast to the traditional mehod, this angular tape is gummed on both sides, just like the boat material. The webs are bonded together in this manner except for an intended end region. The tube produced thus is then turned inside out. The non-bonded end region is then sealed and the corresponding moulded part is further processed, as before, into a boat.

In the accompanying drawings: Figure 1 shows a side view of a moulded part produced according to the traditional method, Figure 2 shows a sectional view of the moulded part according to Fig. 1 along the line A-B, Figure 3 shows a side view of a moulded part produced according to the method of the invention, Figure 4 shows a sectional view thereof, Figure 5 shows a side view of a corresponding moulded part, whereby both webs are additionally sewn along the adhesive join, and Figure 6 shows a corresponding sectional view.

In each of the drawings, reference numeral 1 denotes the boat material. This boat material is gummed on two sides. The webs cut from the boat material are joined together in an air-tight manner in the prior art construction according to Figs. 1 and 2 using the angular tape 2. This produces a beard or beard seam 3 in the joining region.

As can be seen from Figs. 3 and 4, in the method according to the invention, the webs used to construct the boat part are bonded except for an end region 5, using an adhesive tape 4 gummed on both sides. The part is then turned inside out through the opening 5 so that the joining tape 4, as can be clearly seen in Fig. 4, lies outside as a covering tape.

The seam 3 is inside the part and is therefore invisible to the obsrver. The open end region 5 is then also bonded, the moulded part is inflated and the seam is finally covered either using a rubber section or a tape.

As can be seen from Figs. 5 and 6, if, for reasons of strength, it is desired to firmly join both fabric webs additionally by means of a sewn machine seam, this can be effected by firstly bonding the webs which are lying on top of each other on their outsides, together, and then sewing the projecting edge using a sewing machine seam. The part thus produced is then turned inside out and also sealed at the opening 5, as described above, optionally with the addition of sewing. The sewn seam 6 thus comes to be located on the inside, as can be clearly seen from Fig. 6, and is thus invisible.

1. A method for the production of hollow moulded parts from gummed fabric webs, wherein the gummed fabric webs are bonded together at a joining edge, except for an end region, using a tape gummed on both sides and positioned between the webs, and the moulded parts are then turned inside out and the end region is sealed from outside.

2. A method according to claim 1, wherein the fabric webs are sewn together along the adhesive edge after bonding by the

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A method for the production of hollow moulded parts, for example for the construction of inflatable boats The present invention relates to a method for the production of hollow moulded parts from gummed fabric webs, for example for the production of parts for inflatable boats. It is known to produce boat parts for inflatable boats using fabric webs, which are gummed on two sides corresponding to the shape of parts to be produced, and sealed together in an air-tight manner by a so-called folded diagonal tape which is glued between the fabric webs over the entire seam so that the two webs are joined together in an undetachable manner to produce an air-tight sealed-off hollow moulded body. A disadvantage of these moulded parts is the fact that in the joining region between the two webs, in spite of the air-tight join using a folded diagonal tape, an edge, a so-called beard, or, where the edges of the webs have been additionally sewn, a beard seam is visi ble. This seam not only spoils the appearance of the individual moulded parts, but also impairs its function, since a beard or beard seam is disturbing when sitting on the corresponding moulded part as well as preventing other objects from being set down. There is also the danger that the parts joined together can be torn apart at the projecting edges. The object of the invention is to provide a method in which the beard or the beard seam becomes invisible at the corresponding moulded parts of the boat without necessitating a particular treatment for the edges and in which the production method used hitherto may be substantially retained. According to the invention there is provided a method for the production of hollow moulded parts from gummed fabric webs, wherein the gummed fabric webs are bonded together at a joining edge, except for an end region, using a tape gummed on both sides and positioned between the webs, and the moulded parts are then turned inside out and the end region is sealed from outside. In the method of the invention, as applied to the production of boat parts, the webs to be joined together are therefore positioned with the faces which are subsequently to be outside on the inside. As in previous methods, a diagonal angular tape is then inserted along the edge, but, in contrast to the traditional mehod, this angular tape is gummed on both sides, just like the boat material. The webs are bonded together in this manner except for an intended end region. The tube produced thus is then turned inside out. The non-bonded end region is then sealed and the corresponding moulded part is further processed, as before, into a boat. In the accompanying drawings: Figure 1 shows a side view of a moulded part produced according to the traditional method, Figure 2 shows a sectional view of the moulded part according to Fig. 1 along the line A-B, Figure 3 shows a side view of a moulded part produced according to the method of the invention, Figure 4 shows a sectional view thereof, Figure 5 shows a side view of a corresponding moulded part, whereby both webs are additionally sewn along the adhesive join, and Figure 6 shows a corresponding sectional view. In each of the drawings, reference numeral 1 denotes the boat material. This boat material is gummed on two sides. The webs cut from the boat material are joined together in an air-tight manner in the prior art construction according to Figs. 1 and 2 using the angular tape 2. This produces a beard or beard seam 3 in the joining region. As can be seen from Figs. 3 and 4, in the method according to the invention, the webs used to construct the boat part are bonded except for an end region 5, using an adhesive tape 4 gummed on both sides. The part is then turned inside out through the opening 5 so that the joining tape 4, as can be clearly seen in Fig. 4, lies outside as a covering tape. The seam 3 is inside the part and is therefore invisible to the obsrver. The open end region 5 is then also bonded, the moulded part is inflated and the seam is finally covered either using a rubber section or a tape. As can be seen from Figs. 5 and 6, if, for reasons of strength, it is desired to firmly join both fabric webs additionally by means of a sewn machine seam, this can be effected by firstly bonding the webs which are lying on top of each other on their outsides, together, and then sewing the projecting edge using a sewing machine seam. The part thus produced is then turned inside out and also sealed at the opening 5, as described above, optionally with the addition of sewing. The sewn seam 6 thus comes to be located on the inside, as can be clearly seen from Fig. 6, and is thus invisible. CLAIMS

2. A method according to claim 1, wherein the fabric webs are sewn together along the adhesive edge after bonding by the tape and before being turned inside out.

3. A method according to claim 2, wherein the said end region is also sewn after being turned inside out and this seam is covered using a rubber section or a rubber tape.

4. A method according to any preceding claim, wherein the moulded part produced is air-tight.

5. A method for the production of hollow moulded parts, substantially as herein described with reference to Figs. 3 and 4, or Figs. 5 and 6, of the accompanying drawings.

6. A moulded part for the construction of an inflatable boat, produced according to the method of claims 4 or 5.