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US 6,272,001 B1Granted
Emergency stop switch and emergency stop switch circuit
AssigneeThe Nippon Signal Co., Ltd.
InventorKoichi Futsuhara
Life of this patent
Estimating the term…
Abstract
A transformer structured emergency stop switch (10) incorporates a first core member (14) wound with primary and secondary windings, and a second core member (15) which at normal times contacts with the first core member (14) under spring force and in an emergency is separated therefrom by a push button (16). Several transformer structured emergency stop switches (10) are connected in series to make up an emergency stop switch circuit.
Claims14
An emergency stop switch comprising:
- a first core member secured to a fixed body and wound with a primary winding and a secondary winding, a second core member provided so as to be movable towards and away from said first core member, and moving means for moving said second core member, said emergency stop switch characterized in that, when said second core member is made to approach said first core member by said moving means, a transformer is formed by said first and second core members so that AC signal from an AC signal generating source connected to said primary winding side is transmitted to said secondary winding side, and when said second core member is separated from said first core member by said moving means, said AC signal is not transmitted to said secondary winding side;
- wherein said moving means comprises;
- a push button with one end fixed to said second core member, and a resilient member for resiliently urging said second core member in an opposite direction to the push operation direction of said push button, and at normal times, said second core member is made to approach said first core member by the resilient urging force of said resilient member to form a transformer, and when the push button is pushed, said second core member separates from said first core member against the resilient urging force of said resilient member.
An emergency stop switch comprising:
- a first core member secured to a fixed body and wound with a primary winding and a secondary winding, a second core member provided so as to be movable towards and away from said first core member, and moving means for moving said second core member, said emergency stop switch characterized in that, when said second core member is made to approach said first core member by said moving means, a transformer is formed by said first and second core members so that AC signal from an AC signal generating source connected to said primary winding side is transmitted to said secondary winding side, and when said second core member is separated from said first core member by said moving means, said AC signal is not transmitted to said secondary winding side;
- wherein said moving means is an opening and closing door which is attached to a fixed safety fence, and when the door is closed, said second core member approach said first core member which is fixed to said safety fence side to form a transformer, and when the door is opened, said second core member is separated from said first core member.
An emergency stop switch comprising:
- a first core member secured to a fixed body and wound with a primary winding and a secondary winding, a second core member provided so as to be movable towards and away from said first core member, and moving means for moving said second core member, said emergency stop switch characterized in that, when said second core member is made to approach said first core member by said moving means, a transformer is formed by said first and second core members so that AC signal from an AC signal generating source connected to said primary winding side is transmitted to said secondary winding side, and when said second core member is separated from said first core member by said moving means, said AC signal is not transmitted to said secondary winding side;
- wherein said moving means comprises;
- a rope with one end secured to said second core member and the other end secured to a fixed part, and a resilient member for resiliently urging said second core member in a direction opposite to the pulling direction of said rope, and said second core member in a direction opposite to the pulling direction of said rope, and at normal times, said second core member is made to approach said first core member by the resilient urging force of said resilient member to form a transformer, and when said rope is pulled, said second core member separates from said first core member against the resilient urging force of said resilient member.
An emergency stop switch circuit comprising:
- a first core member secured to a fixed body and wound with a primary winding and a secondary winding, a second core member provided so as to be movable towards and away from said first core member, and moving means for moving said second core member, said emergency stop switch characterized in that, when said second core member is made to approach said first core member by said moving means, a transformer is formed by said first and second core members so that AC signal from an AC signal generating source connected to said primary winding side is transmitted to said secondary winding side, and when said second core member is separated from said first core member by said moving means, said AC signal is not transmitted to said secondary winding side;
- wherein an AC signal is supplied from an AC signal generating source to a primary winding side of a first stage emergency stop switch, and an output based on said AC signal is generated from a secondary winding side of a last stage emergency stop switch.
Dependencies are inferred from the claim text.