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1. WO1999028935 - IMPROVEMENTS RELATING TO THERMALLY-RESPONSIVE ACTUATORS

Publication Number WO/1999/028935
Publication Date 10.06.1999
International Application No. PCT/GB1998/003571
International Filing Date 30.11.1998
Chapter 2 Demand Filed 28.06.1999
IPC
H01H 5/18 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
5Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
04Energy stored by deformation of elastic members
18by flexing of blade springs
H01H 5/22 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
5Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
04Energy stored by deformation of elastic members
18by flexing of blade springs
22blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg
H01H 5/24 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
5Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
04Energy stored by deformation of elastic members
18by flexing of blade springs
22blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg
24having three legs
H01H 37/04 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
37Thermally-actuated switches
02Details
04Bases; Housings; Mountings
H01H 37/54 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
37Thermally-actuated switches
02Details
32Thermally-sensitive members
52actuated due to deflection of bimetallic element
54wherein the bimetallic element is inherently snap acting
H01H 37/60 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
37Thermally-actuated switches
02Details
60Means for producing snap action
CPC
H01H 2037/5472
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
37Thermally-actuated switches
02Details
32Thermally-sensitive members
52actuated due to deflection of bimetallic element
54wherein the bimetallic element is inherently snap acting
5472having an omega form, e.g. the bimetallic snap element having a ring shape with a central tongue
H01H 37/043
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
37Thermally-actuated switches
02Details
04Bases; Housings; Mountings
043Mountings on controlled apparatus
H01H 37/54
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
37Thermally-actuated switches
02Details
32Thermally-sensitive members
52actuated due to deflection of bimetallic element
54wherein the bimetallic element is inherently snap acting
H01H 37/60
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
37Thermally-actuated switches
02Details
60Means for producing snap action
H01H 5/18
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
5Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
04Energy stored by deformation of elastic members
18by flexing of blade springs
H01H 5/22
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
5Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
04Energy stored by deformation of elastic members
18by flexing of blade springs
22blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg
Applicants
  • OTTER CONTROLS LIMITED [GB]/[GB] (AllExceptUS)
  • O'NEILL, Robert, Andrew [GB]/[GB] (UsOnly)
  • BOUNDY, Paul [GB]/[GB] (UsOnly)
Inventors
  • O'NEILL, Robert, Andrew
  • BOUNDY, Paul
Agents
  • MILHENCH, Howard, Leslie
Priority Data
9725401.528.11.1997GB
9811400.227.05.1998GB
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) IMPROVEMENTS RELATING TO THERMALLY-RESPONSIVE ACTUATORS
(FR) AMELIORATIONS APPORTEES A DES ACTIONNEURS A SENSIBILITE THERMIQUE
Abstract
(EN) A steam sensor switch for an automatic kettle employs a snap-acting bimetallic actuator to operate an overcentre arrangement by means of a push rod, the overcentre arrangement comprising a C-spring and a trip lever sprung between spaced-apart abutments. Whereas in prior arrangements of this type the trip lever has been arranged to interact with cantilevered spring contact elements which are mechanically deformed in switch operations, in the steam sensor of the invention the spring contact elements are integrally formed with the C-spring so that they pivot about a fulcrum when the overcentre arrangement switches between its two stable conditions and are not subject to mechanical deformation. This contact arrangement, which makes use of an E-shaped spring having the C-spring as the middle one of its three horizontal strokes, enables greater contact separation to be achieved in a small size switch than does the conventional cantilevered arrangement and thereby enhances electrical safety.
(FR) L'invention porte sur un contacteur de détection de vapeur d'une chaudière automatique utilisant un actionneur bimétallique à déclic permettant de déclencher un dispositif à arc-boutement au moyen d'une tige poussoir, ce dispositif à arc-boutement comprenant un ressort en C et un levier de déclenchement en suspension entre des butées espacées. Selon les dispositifs de ce type de la technique antérieure, le levier de déclenchement a été agencé de façon à avoir une interaction avec des éléments de contact à ressort en porte-à-faux qui subissent une déformation mécanique dans des opérations de commutation, alors que dans le détecteur de vapeur de l'invention, ces éléments de contact à ressort sont intégrés au ressort en C de sorte qu'ils pivotent autour d'un point d'articulation lorsque le dispositif à arc-boutement commute entre ses deux états stables et ne sont pas soumis à une déformation mécanique. Ce dispositif de contact, qui utilise un ressort en forme de E renfermant au milieu de ses trois courses horizontales le ressort en C, permet de mieux séparer les contacts d'un petit commutateur que le dispositif traditionnel en porte-à-faux, et augmente ainsi la sécurité électrique.
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