Water heater construction and sealing device therefor
US5040697A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1990 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Aug 22, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C44/1247
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A water heater construction including an inner tank for containing water surrounded in spaced apart relationship by an outer shell. An outer collar of insulation material is located in the annular space between the inner tank and outer shell at a preselected location within the annular space along the height of the water heater construction. The collar has a radial thickness greater than the radial width of the annular space and is radially compressed between the interior wall of the outer shell and exterior wall of the inner tank. An expandable foam thermal insulation material fills the annular space above the collar. A method of making the water heater construction includes the steps of positioning the collar of insulation material around and in contact with the interior wall surface of the outer shell and moving the outer shell downwardly concentrically over the inner tank displacing the inner perimeter margin of the collar at the interface of the collar and the water tank in a generally upward direction to form a trough in the collar at the top side of the collar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.