Elevator rotary lost door interlock
AssigneeOtis Elevator Company
InventorsMichael P. Donohoe, Richard E. Kulak, Christian G. Tonna
Life of this patent
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Abstract
An elevator door interlock has a camming surface which is in contact with a lead of an electrical circuit during normal operation and has a bridge thereon. The interlock rotates the camming surface along the lead to contact the bridge if an elevator door is locked, to not contact the lead if the elevator door is not locked, and to rotate the camming surface out of contact with the leads if the door is missing.
Claims7
An elevator door interlock which bridges a lead of an electrical circuit to indicate that the elevator door is locked, said interlock comprising:
- a rotatable camming surface,
- a bridge disposed upon said surface, and
- means for rotating said camming surface, said means rotating to maintain said lead in contact with said camming surface if said door is not locked, said means rotating said camming surface to move said lead into contact with said bridge if said door is locked, said means rotating said lead out of contact with said camming surface if the door is missing.
An elevator door interlock which bridges a lead of an electrical circuit to indicate that the elevator door is locked, said interlock comprising:
- a rotatable camming surface, and
- a bridge disposed upon said surface,
- means for rotating said camming surface, said means rotating said camming surface and said bridge to a first position relative to said lead if said door is locked, said means rotating to move said camming surface and said bridge to a second position relative to said lead if said door is not locked, said means rotating said camming surface to a third position relative to said lead if the door is missing.
An elevator door interlock which bridges a lead of an electrical circuit to indicate that the elevator door is locked, said interlock comprising:
- a rotatable bridge, and
- means for rotating said bridge, said means rotating said bridge to a first position relative to said lead if said door is locked, said means rotating to move said bridge to a second position relative to said lead if said door is not locked, said means rotating said bridge to a third position relative to said lead if the door is missing.
Dependencies are inferred from the claim text.