Electrical switch
AssigneeE.G.O. Elektro-Geraete Blanc und Fischer
InventorsKarl Fischer, Robert Kicherer
Life of this patent
Estimating the term…
Abstract
An electrical switch comprising a housing, and spring supported in the housing. The spring is made from resilient, flat material and carries a contact at each end thereof, each contact being adapted to engage a respective counter-contact carried by the housing. Two spring tongues are formed on the spring and are supported on support bearings under stress so that a contact can be snapped out of engagement with the corresponding counter-contact upon actuation of an actuating member which engages the spring. Preferably the actuating member is temperature-sensitive or is connected to a temperature-sensitive member so that the switch may be used as a temperature-sensitive switching element, thermal relay or thermostat.
Claims33
An electrical switch comprising a spring being made from resilient flat material and having a resilient base portion intermediate end portions, at least one contact carried on each portion, counter-contacts for engagement with respective contacts, spring tongues carried by said spring, the spring tongues being directed in opposite directions relative to one another, support bearings mounted in a fixed position with respect to said counter-contacts and adapted to support the ends of the spring tongues, the spring tongues being under stress and the ends of the tongues supported by the support bearings being directed towards one another, and an actuating member, moveable with respect to said support bearings, for engaging the resilient base portion of said spring and moving said contacts towards or away from said counter-contacts.
An electrical switch comprising a housing, a spring supported in the housing, the spring being made from resilient flat material and having a resilient base portion intermediate two end portions, at least one contact carried on each portion, counter-contacts carried by the housing for engagement with respective contacts, two spring tongues carried by said spring, the two spring tongues being directed in opposite directions relative to one another, two support bearings adapted to support the ends of the two spring tongues, the two spring tongues being under stress and the ends of the tongues supported by the support bearings being directed towards one another, actuating means engaging said spring for moving said contacts, an expansion element for actuating said actuating means, the expansion element comprising a rod having a low coefficient of thermal expansion and an expansion sleeve having a high coefficient of thermal expansion, the rod extending within the expansion sleeve, the switch being associated with an electrical cooking appliance so that the expansion element is subjected to the temperature of the electrical cooking appliance, an electrical power supply circuit for said electrical cooking appliance, one of the two contacts on said spring acting as a working contact to interrupt said electrical power supply circuit when a predetermined limit temperature has been attained, and the other contact on said spring acting as a safety contact to interrupt said electrical power supply circuit when a second temperature, which is substantially greater than said limit temperature, is attained.
An electrical switch comprising a housing, a spring supported in the housing, the spring being made from resilient flat material and having a resilient base portion intermediate two end portions, at least one contact carried on each portion, counter-contacts carried by the housing for engagement with respective contacts, two spring tongues carried by said spring, the two spring tongues being directed in opposite directions relative to one another, two support bearings adapted to support the ends of the two spring tongues, the two spring tongues being under stress and the ends of the tongues supported by the support bearings being directed towards one another, an actuating member for engaging said spring and moving said contacts towards or away from said counter-contacts and an expansion element communicating with said actuating member and comprising a rod having a low coefficient of thermal expansion and an expansion sleeve having a high coefficient of thermal expansion, the rod extending within the expansion sleeve, said expansion element being subjected to the temperature of an electrical cooking appliance, and one of the two contacts on said spring acting as a working contact to interrupt an electrical power supply to the electrical cooking appliance when a predetermined limit temperature has been obtained and the other contact acting as a safety contact to switch off the power supply at a second temperature which is substantially greater than said limit temperature.
An electrical switch comprising a housing, a spring supported in the housing, the spring being made from resilient flat material and having a resilient base portion intermediate two end portions, at least one contact carried on each portion, counter-contacts carried by the housing for engagement with respective contacts, two spring tongues carried by said spring, the two spring tongues being directed in opposite directions relative to one another, two support bearings ridgedly arranged in the switch housing and adapted to support the ends of the two spring tongues, the two spring tongues being under stress and the ends of the tongues supported by the support bearings being directed towards one another, and an actuating member carried by said switch housing independently of said support bearings for engaging the resilient base portion of said spring and moving said contacts towards or away from said counter-contacts.
An electrical switch comprising a housing, a spring supported in the housing, the spring being made from a resilient flat material and having a resilient base portion intermediate two end portions, at least one contact carried on each portion, counter-contacts carried by the housing for engagement with respective contacts, two spring tongues carried by said spring, the two spring tongues being directed in opposite directions relative to one another, two support bearings adapted to support the ends of the two spring tongues, the two spring tongues being under stress and the ends of the tongues supported by the support bearings being directed towards one another, an actuating member, moveable with respect to said support bearings, comprising a pull element which engages behind the resilient base member of the spring, and biasing means in addition to said actuating member for pressing said pull element against said actuating member, said pull element engaging said spring and moving said contacts toward or away from said counter-contacts.
Dependencies are inferred from the claim text.