Process for producing a thermally insulated flask
AssigneeSigg AG
InventorIsidor Fritschi
Life of this patent
Estimating the term…
Abstract
A thermally insulating flask having two containers of flow-pressed aluminum, wherein an inner container is placed inside and at a distance from an outer container. The inner container forms a flask neck at the top of the inner container, which is connected in an air-tight manner with the outer container. Both containers are connected at the top by a material of low thermal conductivity, for example chrome-nickel steel, in an air-tight and rigid manner. The connecting piece can be constructed from a composite-plated chrome-nickel steel laminate, in which the aluminum layer has been removed by a lathe, leaving two collar rims, to allow welding to the aluminum containers, while the remaining chrome-nickel steel layer forms the mechanical connection which has low thermal conductivity.
Claims4
A process for manufacturing a thermally insulated flask comprising:
- positioning a first container (1) within a second container (2), the second container (2) comprising aluminum which was one of flow-pressed cold and deep-drawn, the first container (1) forming a neck having an opening, the second container (2) having an opening at the top of the second container (2),
- securing the top of the first container (1) with respect to the second container (2) with a connecting piece (3), the connecting piece (3) comprising a composite-plated laminate and having an aluminum layer (5) and a low thermal conductivity layer (6), a first portion of the aluminum layer removed from the connecting piece (3) leaving a second portion of the aluminum layer on a first rim and a second rim for connecting the connecting piece (3) to the first container (1) and the second container (2), respectively,
- evacuating the gas present in an intermediate space between the first container (1) and the second container (2) through a small metal tube (9) soldered in a vacuum-tight manner to the connecting piece (3),
- and closing the small metal tube (9) by cold welding.
A process for producing a thermally insulated flask comprising:
- positioning a first container (1) within a second container (2) comprising aluminum which was one of flow-pressed cold and deep-drawn, the first container (1) forming a neck having an opening, the second container (2) having an opening at the top of the second container (2), and
- securing the top of the first container (1) with respect to the second container (2) with a connecting piece (3) in a vacuum chamber, the connecting piece (3) comprising a composite-plated laminate and having an aluminum layer (5) and a low thermal conductivity layer (6), a first portion of the aluminum layer removed from the connecting piece (3) leaving a second portion of the aluminum layer on a first rim and a second rim for connecting the connecting piece (3) to the first container (1) and the second container (2), respectively.
Dependencies are inferred from the claim text.