Method of forming a vandal-resistant seat

• US 5,275,769 A
• Filed: 06/11/1992
• Issued: 01/04/1994
• Est. Priority Date: 12/11/1989
• Status: Expired due to Fees

• Current Assignee: Henderson'S Industries Pty., Ltd.
• Original Assignee: Henderson'S Industries Pty., Ltd.
• Inventors: Clements, John A.
• Primary Examiner(s): Kuhns, Allan R.
• Application Number:
  US07/854,622
• Time in Patent Office: 572 Days
• Field of Search: 264/40.3, 264/46.4, 264/46.6, 264/46.8, 425/812
• US Class Current: 264/46.4
• CPC Class Codes: B29C 44/145 the lining being a laminate
• CPC Class Codes: B29C 44/588 with means for venting, e.g. releasing foaming gas
• CPC Class Codes: B29C 44/60 Measuring, controlling or regulating
• CPC Class Codes: B29K 2101/10 Thermosetting resins
• CPC Class Codes: B29K 2105/06 containing reinforcements, fillers or inserts
• CPC Class Codes: Y10S 425/812 Venting

Abstract

A method of manufacturing an article is disclosed which includes an outer fabric material and an inner micro-cellular thermosetting foam plastics material. The method includes facing the outer fabric material, which has been treated on its inner side with a flexible thermosetting plastics material composition, in a mould, closing the mould to define a mould cavity and to deform the fabric material to a predetermined configuration, injecting a foamable flexible thermosetting plastics material composition into the mould, allowing the foamable flexible plastics material to react and completely fill the mould, the pressure of the reaction in the closed spaced of the mould causing the flexible plastics material to bond to the fabric material, allowing the resultant fabric covered micro-cellular foam plastics material to cure, and opening the mould and removing the article.

Claims

1. A method of manufacturing a formed wire mesh reinforced (vandal resistant) article including an outer fabric material and an inner micro-cellular thermosetting foam plastics material, comprising:

placing the outer fabric material, which has been treated on its inner side with a flexible thermosetting plastics material composition and a wire mesh in a mould;

closing the mould to define a mould cavity having a predetermined volume and to deform the fabric material and the wire mesh to a predetermined configuration;

injecting a foamable flexible thermosetting plastics material composition into said mould cavity in an amount, such that the unfoamed volume of the material is at least 50% of the volume of the mould cavity and the volume of the mould cavity is up to 50% of the volume that the foamable material would occupy if it were allowed to foam unfettered to its maximum volume;

allowing the foamable flexible plastics material to react and completely fill said mould, the pressure of the reaction in the closed space of the mould causing the flexible plastics material to bond to the fabric material;

allowing the resultant fabric covered micro-cellular foam plastics material to cure; and

opening the mould and removing the article.

2. A method as claimed in claim 1, in which the volume of unexpanded foamable material injected into the mould cavity is from 60% to 99% of the volume of the cavity.

3. A method as claimed in claim 1, in which the volume of unexpanded foamable material injected into the mould cavity is from 75% to 95% of the volume of the cavity.

4. A method as claimed in claim 1, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.

5. A method as claimed in claim 4, wherein the foamable flexible thermosetting plastics material is injected into the mould at the top of the mould and the vent is at the bottom of the mould.

6. A method as claimed in claim 2, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.

7. A method as claimed in claim 3, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.

8. A method as claimed in claim 5, in which the volume of unexpanded foamable material injected into the mould cavity is from 60% to 99% of the volume of the cavity.

9. A method as claimed in claim 5, in which the volume of unexpanded foamable material injected into the mould cavity is from 75% to 95% of the volume of the cavity.

10. A method as claimed in claim 8, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.

11. A method as claimed in claim 9, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.

13. A method as claimed in claim 10, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.

14. A method as claimed in claim 11, wherein the foamable flexible thermosetting plastics material is injected into the mould at the top of the mould and the vent is at the bottom of the mould.

12. A method of manufacturing a formed wire mesh reinforced article including an outer fabric material and an inner micro-cellular foam thermosetting comprising placing the outer fabric material, treated on its inner side with a flexible thermosetting plastics material composition in a mould;

closing the mould to deform the fabric material to a predetermined configuration;

opening the mould and inserting the wire mesh on the inner side of the fabric;

closing the mould to form an enclosed mould cavity having a predetermined volume and injecting a foamable thermosetting plastics material composition into the mould cavity in an amount, such that the unfoamed volume of the material is at least 50% of the volume of the mould cavity and the volume of the mould cavity is up to 50% of the volume that the foamable material would occupy if it were allowed to foam unfettered to its maximum volume;

allowing the foamable flexible plastics material to react and completely fill the mould, the pressure of the reaction in the closed space of the mould causing the flexible plastics material to surround the wire mesh and to bond to the fabric material;

allowing the resultant fabric covered reinforced micro-cellular foam plastics material to cure; and

opening the mould and removing the article.

15. A method of manufacturing a formed article comprising:

placing a preform having an outer fabric material, treated on its inner side with a flexible thermosetting plastics material composition and an inner metal mesh in a mould;

injecting a foamable flexible thermosetting plastics material composition into said mould cavity in an amount, such that the unfoamed volume of the material is at least 50% of the volume of the mould cavity and the volume of the mould cavity is up to 50% of the volume that the foamable material would occupy if it were allowed to foam unfettered to it'"'"'s maximum volume;

allowing the foamable flexible plastics material to react and completely fill said mould, the pressure of the reaction in the closed space of the mould causing the flexible plastics material to bond to the fabric material;

allowing the resultant fabric covered micro-cellular foam plastics material to cure; and

opening the mould and removing the article.

16. A method as claimed in claim 15, in which the volume of unexpanded foamable material injected into the mould cavity is from 60% to 99% of the volume of the cavity.

17. A method as claimed in claim 15, in which the volume of unexpanded foamable material injected into the mould cavity is from 75% to 95% of the volume of the cavity.

18. A method as claimed in claim 15, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.

19. A method as claimed in claim 18, wherein the foamable flexible thermosetting plastics material is injected into the mould at the top of the mould and the vent is at the bottom of the mould.

20. A method as claimed in claim 16, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.

21. A method as claimed in claim 17, in which the mould includes a vent to permit air to escape from the mould cavity as it is displaced due to the injection of the foamable flexible thermosetting plastics material.