US 4,055,985 AGranted

Apparatus for testing the surface quality of a vessel mouth

AssigneeEmhart Zurich S. A.

InventorWerner Munz

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Abstract

An apparatus for testing the surface quality of a vessel mouth including a test head adapted to be placed over the vessel mouth, a line connecting the test head to a supply of test gas, a passageway through the test head for introducing gas into the vessel, and a pressure measuring instrument connected to the gas line for generating an electrical signal when a pressure change of a predetermined tolerance value occurs. A sealing washer of spring stiffness is mounted on the test head for bearing against the vessel mouth and a valve is provided in the test head to open the passageway when the washer is pressed against the vessel and to close the passageway when the test head is removed from the vessel. In addition, the sealing washer and valve may be pivotable and means for generating a fault signal may be provided for generating a signal when the washer has been pivoted a predetermined amount.

Claims10

Dependent claims

In an apparatus for testing the surface quality of a vessel mouth, said apparatus including a test head adapted to be placed temporarily over the vessel mouth, means connecting the test head to a source of test gas, passage means through said test head for introducing gas into said vessel, and a pressure measuring instrument connected to said means connecting the test head to a source of test gas, said pressure measuring instrument adapted to generate an electrical signal when a pressure change of a predetermined tolerance value occurs, the improvement comprising:

a. a sealing washer of spring stiffness mounted on said test head and having a first surface for bearing against the vessel mouth, said test head having a bearing surface against which the other surface of said washer bears, and
b. valve means in said test head for opening the passage means when the washer is pressed against a vessel mouth and closing said passage means when the test head is removed from the vessel.

Dependencies are inferred from the claim text.