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US 3,938,393 AGranted
Measuring instruments
AssigneeTempress A/S
InventorsRasmus Langballe Mogensen, Hans Erik Sallerup
Life of this patent
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AssigneeTempress A/S
InventorsRasmus Langballe Mogensen, Hans Erik Sallerup
Estimating the term…
A measuring instrument such as a manometer adapted to be mounted in a fluid pressure system and having a rigid, generally closed instrument casing, the rear wall of which is provided with an opening in which there is inserted a blow out security element which is combined with a deformable bellow member extending into the casing so as to be able to accomodate thermal expansion and contraction of the gas or liquid enclosed within the casing, the interior of the bellow being connected to the atmosphere through a passage in the outer portion of said blow out security element. Further, as a separate sales article for mounting in an opening in the casing wall of an already existing measuring instrument, an insert unit made as a blow out element having integrally or disintegrally associated therewith a bellow member operable to be inserted through said opening when the insert unit is mounted in the opening.
A measuring instrument comprising a rigid instrument casing having an opening in a wall portion thereof and a security disc or stopper member sealingly inserted in said opening so as to be able to be blown out from the opening by an excessive overpressure inside the casing, said instrument further having a pressure equalizing bellow member located inside the casing and the interior of which is connected to the atmosphere outside the casing through vent hole means in the wall of the casing, characterized in that the bellow member is mounted in connection with the blow out member, the said vent hole means being provided in the blow out member.
Dependencies are inferred from the claim text.