GB617638A - Improvements in and relating to expansible bellows assemblies for fluid-pressure-sensitive control devices - Google Patents

Abstract

617,638. Temperature-responsive actuating elements. BRITISH THERMOSTAT CO., Ltd., and SHERLOCK, J. E. Aug. 29, 1946, No. 26004. [Class 64(ii)] [Also in Group XIX] An expansible bellows assembly for thermostats comprises a sleeve-like housing 8 open at each end and divided internally into twc isolated compartments by an expansible metal bellows 1 located within the housing by a locating member 5 which fits coaxially within and is sealed to the peripheral wall of the housing 8, one end of the bellows being secured at its periphery to an end wall 4 of the locating member 5 around an opening in that wall and the other end of the bellows being closed by a plate 2 secured to it and carrying an operating arm 14, the locating member 5 being provided with abutment means, e.g. tongues 16, for limiting the movement of the bellows in one or both of its directions of movement. In the form shown, parts of the side wall of the member 5 are cut away to form three arms 15 from which the tongues 16 are pressed and a spring 17 is provided. In other forms, the side wall of the member 5 is not cut away, and tongues like 16 are formed or alternatively indentations are formed at the end of the member 5 to limit movement of the plate 2 in one direction, the housing 8 limiting it in the other direction. The periphery of the plate 2 may be recessed to enable the plate to pass over the stops during assembly.