Hydraulic parking brake for a railroad vehicle braking system

A hydraulic parking brake assembly for a railroad vehicle braking system, such railroad vehicle braking system including an air cylinder, an air cylinder piston and an air cylinder transfer lever, said hydraulic parking brake assembly comprising:

• (a) a hydraulic actuator engaged with such railroad vehicle braking system;
• (b) a hydraulic piston member positioned within said hydraulic actuator, said hydraulic piston member being capable of movement in a forwardly direction upon application of hydraulic pressure thereto;
• and
• (c) a spindle having a first end and a second end,
• (i) said first end being connected with said hydraulic piston member such that said spindle moves in accordance with movement of said hydraulic piston member, and
• (ii) said second end of said spindle being capable of entering an aperture within such air cylinder and applying a force to such air cylinder piston to cause movement of such air cylinder piston to initiate a braking sequence to achieve application of the parking brake to such railroad vehicle.

A hydraulic parking brake assembly for a truck mounted vehicle braking system, such truck mounted vehicle braking system including an air cylinder, an air cylinder push rod, an air cylinder transfer lever, a return push rod and a slack adjuster assembly, said hydraulic parking brake assembly comprising:

• (a) a hydraulic actuator engaged with such return push rod of such truck mounted vehicle braking system;
• (b) a hydraulic piston member positioned within said hydraulic actuator, said hydraulic piston member being capable of movement in a forwardly direction upon application of hydraulic pressure to said hydraulic piston member;
• and
• (c) a spindle having a first end and a second end,
• (i) said first end of said spindle being connected with said hydraulic piston member such that said spindle moves in accordance with movement of said hydraulic piston member, and
• (ii) said second end of said spindle being capable of entering an aperture within such air cylinder and applying a force to such air cylinder piston of such truck mounted vehicle braking system causing forward movement of such air cylinder piston, such forward movement of such air cylinder piston causing such air cylinder transfer lever to rotate and apply a force to such air cylinder push rod and such slack adjuster assembly of such truck mounted vehicle braking system to achieve activation of said parking brake assembly.

A hydraulic actuated parking brake assembly for a railroad vehicle braking system comprising:

• (a) an air cylinder engaged with such railroad vehicle braking system, said air cylinder having an aperture disposed through a surface thereof;
• (b) a piston located within said air cylinder, one end of said piston being connected with an air cylinder transfer lever and an oppositely disposed end located adjacent said aperture within said air cylinder;
• (c) a hydraulic actuator mounted on such railroad vehicle braking system;
• (d) a hydraulic piston member positioned within said hydraulic actuator, said hydraulic piston member being capable of movement in a forwardly direction upon application of hydraulic pressure thereto;
• and
• (e) a spindle having a first end and a second end,
• (i) said first end being connected with said hydraulic piston member such that said spindle moves in accordance with movement of said hydraulic piston member, and
• (ii) said second end of said spindle entering through said aperture within said air cylinder and applying a force to said oppositely disposed end of said air cylinder piston to cause movement of said air cylinder piston to initiate a braking sequence to achieve application of the parking brake to such railroad vehicle.