Patent ID: 8348202
Filing Date: 2013-01-08
Classification: B61L

Abstract:
1. A switch machine for moving a set of railroad points, comprising: a motor, said motor being operatively coupled to said points for selectively moving said points, said motor being operatively coupled to a power supply through a normal connection path and a reverse connection path, said motor being structured to be selectively driven in a normal direction for moving said points toward a normal position when power is applied thereto by said power supply through said normal connection path and in a reverse direction when power is applied thereto by said power supply through said reverse connection path; a first relay having one or more first normally open contacts and one or more first normally closed contacts, said one or more first normally open contacts being provided in said normal connection path, each of said one or more first normally open contacts being associated with a corresponding one of said one or more first normally closed contacts; and a second relay having one or more second normally open contacts and one or more second normally closed contacts, said one or more second normally open contacts being provided in said reverse connection path, each of said one or more second normally open contacts being associated with a corresponding one of said one or more second normally closed contacts; wherein said first relay is structured such that each first normally closed contact and the corresponding first normally open contact cannot be simultaneously closed and said second relay is structured such that each second normally closed contact and the corresponding second normally open contact cannot be simultaneously closed.