Switch machine cam bar

Details Switch machine cam bar Switch machine cam bar

1996-03-28

1996-12-24

Le, Mark T.

Railway switches and signals

Switches

Lock

246401, E01B 700

Patent

active

055867375

ABSTRACT:
There is provided a cam bar of a railroad track switch machine for locking a lock bar at a particular position. Specifically, a cam bar latch interconnects a locking section, for interlocking with the lock bar, to a positioning section, for controlling the position of the locking section. For normal operations, the cam bar latch holds the two sections together. For abnormal conditions, when the cam bar is not able to lock the lock bar into position, the cam bar latch allows the two sections of the cam bar to separate and reconnect interchangeably. Thus, the positioning section may continue to move freely regardless of whether the lock bar is locked or not, and yet, control the position of the locking section when a normal condition returns. Also, the cam bar prevents an indicating means of the switch machine from indicating a "safe condition" when the two sections are separated, i.e., when an abnormal condition exists.

REFERENCES:
patent: 998525 (1911-07-01), Kaltschmidt
patent: 1071798 (1913-09-01), Rollings et al.
patent: 1976829 (1934-10-01), Bone
patent: 1976830 (1934-10-01), Bone et al.
patent: 2019189 (1935-10-01), Whirter et al.
patent: 2022359 (1935-11-01), McWhirter
patent: 2082142 (1937-06-01), Bone
patent: 2337636 (1943-12-01), Bone et al.
patent: 3652849 (1972-03-01), Kleppick
patent: 4896850 (1990-01-01), Carmes

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