Collapsible molds and spacers therefor

• US 3,985,329 A
• Filed: 03/24/1975
• Issued: 10/12/1976
• Est. Priority Date: 03/28/1974
• Status: Expired due to Term

• Current Assignee: Karl Liedgens
• Original Assignee: Karl Liedgens
• Inventors: Liedgens, Karl
• Primary Examiner(s): Baldwin, Robert D.
• Assistant Examiner(s): McQuade, John
• Application Number:
  US05/561,065
• Time in Patent Office: 568 Days
• Field of Search: 249/40-46, 249/190-191, 249/213-218, 52/699
• US Class Current: 249/40
• CPC Class Codes: E04B 2/8647 with ties going through the forms
• CPC Class Codes: E04B 2002/8694 with hinged spacers allowing the formwork to be collapsed for transport
• CPC Class Codes: E04G 17/065 Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
• CPC Class Codes: E04G 17/0654 remaining completely or partially embedded in the cast material

Abstract

Spacer for the connection of mold plates for making collapsible molds elements comprising a spacing portion which has at its ends holding portions, hinge like secured thereto via flexible hinges, wherein said spacing portion and said holding portions at its ends connected with one another via the flexible hinges are one piece of plastic material; and molds made therefrom.

Claims

1. For use in a mold for concrete or the like, elongated spacer means for interconnecting mold plates and comprising an elongated spacer portion having opposed ends, a pair of holding plates situated at said opposed ends of said elongated spacer portion, and adapted to rest against inner surfaces of a pair of mold plates whose inner surfaces are directed toward each other, and a pair of flexible hinge means respectively interconnecting said holding plates with said spacer portion at said ends thereof for rendering said holding plates turnable with respect to said spacer portion about a pair of parallel axes, respectively, and a pair of fastening means respectively fixed to said holding plates and extending outwardly therefrom away from the spacer portion between said holding plates, said pair of fastening means being adapted to extend through openings of a pair of mold plates for fastening the latter to said holding plates, said spacer portion, holding plates, and flexible hinge means all being integral with each other and made of plastic material so as to form a single body of plastic material.

2. The combination of claim 1 and wherein each fastening means includes an elongated member having an external thread and a nut threaded on to said elongated member.

3. The combination of claim 2 and wherein said nut is in the form of a tubular member having an internal thread and carrying at its outer end a cover plate for engaging an exterior surface of a mold plate.

4. The combination of claim 1 and wherein each fastening means includes an elongated member formed with an internal bore and having an internal thread, and a holding screw threaded into said bore.

5. The combination of claim 1 and wherein each fastening means includes an elongated member adapted to extend through an opening of a mold plate and formed with an internal bore extending axially along said elongated member.

6. The combination of claim 5 and wherein said elongated member is formed with an interior thread at said bore thereof.

7. The combination of claim 1 and wherein each fastening means includes an elongated member adapted to extend through an opening of a mold plate and formed with a bore passing transversely through said elongated member, and a fastener pin received in said bore.

8. The combination of claim 1 and wherein said elongated spacer portion is in the form of a substantially flat bar.

9. The combination of claim 8 and wherein said bar is flexible.

10. The combination of claim 8 and wherein said bar has opposed longitudinally extending reinforced edges and is of a substantially I-shaped cross section.

11. The combination of claim 8 and wherein said bar is formed with at least one passage extending therethrough.

12. The combination of claim 11 and wherein said passage is defined by an endless edge which is reinforced.

13. The combination of claim 1 and including a pair of mold plates respectively having inner surfaces directed toward each other and engaging said holding plates, said mold plates respectively being formed with bores through which the pair of fastening means respectively extend for fastening said mold plates to said spacer means in a manner rendering the assembly movable between a collapsed position where the mold plates are relatively close to each other with the spacer portion extending longitudinally along and situated between the mold plates while being substantially parellel thereto, and an expanded position of use where the mold plates are relatively distant from each other while the spacer portion extends perpendicularly with respect to the mold plates.

14. The combination of claim 13 and wherein the pair of flexible hinge means provide parallel hinge axes situated closely adjacent to the inner surfaces of the mold plates.