Compact control and monitoring switch
AssigneeCondor Werke-Gebruder Frede GmbH & Co KG
InventorDieter Frede
Life of this patent
Estimating the term…
Abstract
A device for control and monitoring of pressure in a system combines a conventional three pole pressure switch with the following additional features: (1) a lock mechanism with three influencing input factors and a single resulting output contact action, (2) a three pole thermal release device as one of the input factors, and (3) a remote control tripping device as another input factor, all integrated into a single, compact, modular unit. The thermal release device comprises a plurality of bimetals which sense electrical flow passing through the device, and which are mechanically connected to a locking mechanism to shut off current if the electrical flow reaches a predetermined maximum. If any of the three inputs activates the locking mechanism, the device must be reset by an operator.
Claims15
A pressure control device comprising a base, means for sensing the pressure in a system mounted to said base, and a removable contact block mounted to said base, said contact block having a plurality of cells and comprising:
- a contact block cover;
- a plurality of fixed contacts, each mounted within a cell;
- and
- a lock mounted onto the contact block cover, wherein the lock can be compulsorily bought to an "OFF" position in response to any of three inputs, said inputs consisting of a manual switch, a thermal release device, and a remote control device;
- said thermal release device being integrated into the contact block so that electrical current:flowing through the contact block is guided over wound bimetals to the fixed contacts, said bimetals being at one end connected to the lock by a slide such that overcurrent will cause the lock to be brought to an "OFF" position.
A pressure control device comprising a base, means for sensing the pressure in a system mounted to said base, and a removable contact block mounted to said base, said contact block having a plurality of cells and comprising:
- a cover;
- a plurality of fixed contacts, each mounted within a cell;
- and
- a lock mounted onto the contact block, wherein the lock can be compulsorily bought to an "OFF" position in response to any of three inputs, said inputs consisting of a manual switch, a thermal release device, and a remote control device, each being integrated into the contact block to provide a single compact unit;
- wherein electrical current flowing through the contact block is guided over wound bimetals to the fixed contacts, each of said bimetals being at one end connected to the lock by a slide such that overcurrent will cause the lock to be brought to an "OFF" position.
A pressure control device comprising a base, means for sensing the pressure in a system mounted to said base, and a removable contact block mounted to said base, said contact block having a plurality of cells and comprising:
- a contact block cover;
- a plurality of fixed contacts, each mounted within a cell;
- and
- a lock mounted onto the contact block cover, wherein the lock can be compulsorily bought to an "OFF" position in response to any of three inputs, said inputs consisting of a manual switch, a thermal release device, and an undervoltage release for automatically turning off a compressor motor when voltage to the compressor motor decreases to a predetermined level;
- said thermal release device being integrated into the contact block so that electrical current flowing through the contact block is guided over wound bimetals to the fixed contacts, said bimetals being at one end connected to the lock by a slide such that overcurrent will cause the lock to be brought to an "OFF" position.
Dependencies are inferred from the claim text.