US 3,943,880 AGranted

Etch timing device

AssigneeDominion Al-Chrome Corporation

InventorFerdinand M. Svirklys

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Abstract

An etch timing device for timing the etching of aluminum products and the like includes support members for supporting aluminum foil therebetween in a bath of etchant, the aluminum foil having dimensions corresponding to the quantity of aluminum to be etched in the bath. One of the support members is in a fixed position while the other is movable vertically relative to the first member. The movable support member is connected to the lower end of a rod which is slidably mounted in a hollow elongate body member mounted in association with the bath. The upper end of the rod extends above the height of the body member when the aluminum foil is supported and includes a visual indicator and stop means, typically a ring integrally formed with the upper end of the rod. When the ring moves downwardly upon dissolving of the aluminum foil, this provides a visual indication to the operator that the required etching has been completed.

Claims5

Dependent claims

An etch timing device comprising

first and second etchant-resistant support members adapted to cooperatively support a strip of etchant-consumable material therebetween in a bath of etchant,
an elongate body member of etchant-resistant material adapted to be mounted in fixed position association with the bath of etchant, said body member having an axial bore formed therethrough, and
a movable rod-like member of etchant-resistant material and extending through the axial bore in said body member and axially movable in sliding relation to said body member,
one of said support members being mounted on said body member and the other of said support members being mounted on the lower end of said movable rod-like member,
said support members being located external of the body member in straight line alignment and parallel to the axis of the bore in said body member,
said rod-like member, when said first and second support members are in the strip-supporting position, extending beyond the upper extremity of said body member.

3 more elements

Dependencies are inferred from the claim text.