Ranco Inc. of Delaware

Ranco Inc.

Hans Bosing

Guglielmo Rossi

Mario Gemma

A pressostat comprises an operating pressure chamber (4) which is limited by its housing (1) and by an operating membrane (5) or the like including a pressure surface for an output adjustment member (3), at least one spring counteracting the pressure (P) in the operating pressure chamber (4), a switch member (2) which responds when a limit pressure value is exceeded in said working pressure chamber (4), and an enclosed protective chamber (6) arranged concentrically to the working pressure chamber (4) limited by the housing (1), the operating membrane (5) and a protective membrane (7) or the like including pressure surface for the output adjustment member (3). In order, if a fracture of the operating membrane takes place, to ensure switch-off at a substantially lower limit pressure value, there is a first spring (10) counteracting the pressure (P) in the operating pressure chamber (4) arranged outside the operating pressure chamber (4) and the protective chamber (6), and a second spring (9) counteracting the pressure (P) in the operating pressure chamber (4) is arranged within the operating pressure chamber (4), and the pressure surfaces of the two membranes (5, 7) are detachably interconnected via an intermediate member (8) which is firmly connected with one of said pressure surfaces.

Pressostat for pressure sensitive activation

An electrical snap action switch for use in a temperature regulator has a movable contact assembly consisting of a conductive contact carrying arm movable between fixed stops and cantilevered within the switch housing, the contact arm being parallel to and cooperating with a Q-shaped snap-action spring, so that the arm carries the working current while the snap spring acts on the arm to make the switch monostable in operation between the stops.

Growing community of inventors

Munich, Georgia

Hans Bosing