METHOD OF MAKING HEATED CONCRETE FORM ASSEMBLY

• US 3,596,351 A
• Filed: 07/16/1969
• Issued: 08/03/1971
• Est. Priority Date: 07/16/1969
• Status: Expired due to Term

• Current Assignee: Kenneth J. Champney, Roy M. Woodard, Warren D. Tilton
• Original Assignee: Kenneth J. Champney, Roy M. Woodard, Warren D. Tilton
• Inventors: Tilton, Warren D., Champney, Kenneth J., Woodard, Roy M.
• Application Number:
  US04/842,249
• Time in Patent Office: 748 Days
• US Class Current: 29/611
• CPC Class Codes: H05B 3/00 Ohmic-resistance heating
• CPC Class Codes: Y10S 425/11 Heated mold
• CPC Class Codes: Y10T 29/49083 Heater type

Abstract

A method for attaching heating grids and thermal insulation to metal concrete forms comprises the welding of protruding spikes or pins at a multiplicity of points on the form placing a flexible backing having heating elements bonded thereto over the pins and against the form, pressing a rigid plastic insulating sheet over the pins and against the backing and locking the insulation in position against the form by applying friction locknuts on the pins and against the plastic sheet. A flexible plastic layer or sheet may be employed between the grid and the rigid sheet for distributing the pressure and minimizing air passages. The heated concrete form assembly provides for the continuous pressing of the heater elements against the metal of the form and when including a flexible plastic layer between the rigid plastic and the form minimizes the effect of bumps or other irregularities on the surface of the metal form.

Claims

1. The method of securing a heating grid to sheet metal forms and the like and for insulating the grid and form which comprises:

providing a heating grid having a multiplicity of runs of elongated heating members attached to a flexible backing sheet, attaching a multiplicity of metal pins to the sheet metal form to be heated, placing the heating grid against the form with the attached pins passing through the backing sheet and with the heating members on the side thereof adjacent the form, providing a thick sheet of substantially rigid plastic insulating material, placing the rigid plastic sheet against the pins and pressing it into the pins and into position in face engagement with the heating grid, and pressing friction retaining clip elements onto said pins and against said rigid plastic sheet to urge the rigid plastic sheet against said heating grid and press the heating members thereof against the metal form to retain the heating members in good heat conducting relationship with said form.

2. The method of securing a heating grid to a sheet metal form as set forth in claim 1 wherein said rigid plastic sheet is of foamed plastic material.

3. The method of securing a heating grid to sheet metal forms as set forth in claim 1 wherein said backing sheet is an open mesh plastic netting and including the step of bonding the netting to the heating members to retain them in spaced configuration.

4. The method of securing a heating grid to sheet metal forms as set forth in claim 1 including the step of placing a relatively thin sheet of flexible plastic insulation in engagement with the heating grid and backing sheet and pressing the flexible sheet against the grid upon pressing the rigid plastic sheet into position on the pins.