Spring wing controller

摘要

A controller for a spring wing on a frog that utilizes a floating piston rod carrying a fixed piston valve and a free-moving piston head is provided. When the piston rod is actuated by the opening movement of the spring wing, the piston valve separates from the piston head briefly, allowing oil to flow through the piston head in a relatively unrestricted manner. The piston head is spring biased towards the piston valve; upon contact between the piston head and the piston valve, the oil flow through the piston head stops, helping to hold the spring wing in the open position. When the spring wing begins to close, the adjustable oil flow through the controller allows the piston rod to move at a controlled rate, thereby controlling the closure rate of the spring wing.

主权项

1. A controller for a spring wing on a frog, comprising:
a casing comprising a body having front and rear end caps to define a piston chamber; a piston rod operatively connected to and actuated by said spring wing, said piston rod passing through openings in said front and rear end caps; a floating piston head having a central opening through which said piston rod passes; and a piston valve operatively attached to said piston rod and adapted to close said central opening.