Method of constructing insulated door

• US 4,053,972 A
• Filed: 08/04/1976
• Issued: 10/18/1977
• Est. Priority Date: 08/04/1976
• Status: Expired due to Term

• Current Assignee: Premark FEG LLC (Illinois Tool Works Inc.)
• Original Assignee: Hobart Corporation (Illinois Tool Works Inc.)
• Inventors: Kordes, Myron G.
• Primary Examiner(s): Moon, Charlie T.
• Application Number:
  US05/711,453
• Time in Patent Office: 440 Days
• Field of Search: 29/451, 29/423, 29/460, 29/458, 264/46.5, 52/309.11, 312/214, 49/478, 49/501
• US Class Current: 29/423
• CPC Class Codes: B32B 5/20 foamed in situ
• CPC Class Codes: F25D 23/02 Doors; Covers F25D23/08 takes precedence locks or fastenings E05B65/0042
• CPC Class Codes: F25D 23/064 formed by moulding, e.g. moulding in situ
• CPC Class Codes: F25D 23/082 Strips
• CPC Class Codes: Y10T 29/4981 Utilizing transitory attached element or associated separate material
• CPC Class Codes: Y10T 29/49872 Confining elastic part in socket
• CPC Class Codes: Y10T 29/49885 with coating before or during assembling
• CPC Class Codes: Y10T 29/49888 Subsequently coating

Abstract

An insulated door for refrigerators, freezers or similar cabinets where the inner and outer door surfaces are normally subjected to substantially different temperatures. The main door components, the door face and drum, are interconnected without the use of threaded fasteners such as screws or bolts. Instead a hardened, foamed in situ insulating material forms the main interconnection between the door face and drum, securing them together but yet accommodating thermally induced, relative movement between the two components. In constructing the door S-shaped retainers are used which receive in their oppositely opening loops the edges of the face and drum. Temporary spacers are then interposed between the face and drum edges for the foaming operation. Following the filling of the door cavity with insulating material the spacers are removed and an anchoring leg of a gasket is snapped into place into the cavity left by the removal of the spacers, securing the gasket to the door without the use of screws or other mechanical fasteners, but permitting gasket to be removed as necessary for replacement or repair.

Claims

1. A method of constructing an insulated door comprising the steps of:

providing an open, tray-like face having an outer wall, side wall portions extending from said outer wall and a rim extending from said side wall portions inwardly over said outer wall in spaced relationship thereto and terminating in an inner edge defining an opening into said tray-like face,

positioning a drum having an outer periphery over said opening in said tray-like face,

loosely engaging said face rim and said drum periphery with additional separate means restraining relative movement of said face and said drum away from each other while permitting said rim and said periphery to be spaced from each other to define a cavity around said door,

introducing into the space defined by said opposing portions of said drum and said face a foamed in situ insulating material which expands and hardens and adheres to surfaces of said drum, said face and said restraining means, and

subsequent to hardening of said insulating material, attaching a peripheral gasket to said insulated door by inserting an anchoring portion of said gasket into said cavity between said face rim and drum periphery.

2. The method of claim 1 further comprising:

inserting spacing means in said cavity between said facing rim and drum periphery after said rim and periphery are loosely engaged and prior to the introduction of insulating material between said face and said drum and removing said spacing means from said cavity after said hardening of said insulating material.

3. The method of claim 1 wherein:

said step of loosely engaging said rim and said periphery comprises engaging said rim and said periphery with substantially S-shaped retaining means having oppositely opening portions receiving said rim and said periphery.

4. The method of claim 3 wherein said step of loosely engaging said rim and said periphery includes:

loosely positioning said retaining means on said rim of said face with said retaining means displaced outwardly of said face and an edge of said rim substantially seated in a first of said portions of said retaining means,

positioning said drum over said face with said periphery of said drum disposed opposite the second of said portions of said retaining means, and

displacing said retaining means inwardly of said face to receive said drum periphery in said second of said portions of said retaining means.

5. The method of claim 4 further comprising:

positioning spacing means within said first of said portions of said retaining means intermediate said face rim and said drum periphery.

6. The method of claim 5 further comprising:

removing said spacing means after said insulating material has hardened to thereby provide said cavity for said anchoring portion of said peripheral gasket.