# US 2014/0151162 A1 · "Spring-Applied Parking Brake with Ball Screw Reset Mechanism" > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0151162 A1 - Document ID: US20140151162A1 - Status: Published application - Kind: A1 - Application number: 14/096,200 - Filed: 2013-12-04 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Wabtec Holding Corp. - Applicants: Wabtec Holding Corp. - Inventors: Peter D. Mathern; Joseph Michael Dixon - Web page: https://patentgrep.com/patent/US20140151162A1 ## CPC - B61H 13/02: Hand or other personal actuation - B60T 17/086: {Spring loaded brake actuators with emergency release device} - B61H 13/005: {Spring actuation} - F16D 2121/16: for releasing a normally applied brake - F16D 2125/36: Helical cams, Ball-rotating ramps - F16D 2127/04: for manual operation - B61H: BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES (arrangements in rail vehicles for adjusting wheel-braking force to meet varying vehicular or permanent-way conditions B60T8/00; transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive, brake systems incorporating such transmitting means, e.g. air-pressure brake systems, B60T13/00; construction, arrangement or operation of valves incorporated in power brake systems B60T15/00; component parts, details or accessories of brake systems B60T17/00) - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract A parking brake for a railway vehicle includes a pneumatic cylinder having a cylinder wall, a first wall opposite a second wall, and a piston movable within the pneumatic cylinder. At least one spring extends between the piston and the second wall for biasing the piston against the first wall. A gear box is fixed relative to the second wall and includes a hand wheel. A spindle is operatively connected to the gear box to affect movement of a manual reset mechanism having a threaded shaft and a ball screw nut rotatably engaged with the threaded shaft. A pushrod is connected to the manual reset mechanism and extends through the cylinder and the first wall. When the hand wheel is rotated, the manual reset mechanism is rotated to cause the pushrod to move relative to the piston corresponding to the direction of the rotation of the hand wheel. ## Claims ### Claim 1 A spring-applied parking brake with manual release and reapply comprising: a pneumatic cylinder having a cylinder wall and a first wall provided opposite a second wall; a piston movable within the pneumatic cylinder and sealed relative to the cylinder wall; at least one spring extending between the piston and the second wall for biasing the piston against the first wall when the pneumatic cylinder is depressurized; a pneumatic pressure inlet for applying pressure to move the piston against the spring toward the second wall; a manual hand wheel; a spindle operatively connected to the manual hand wheel to affect movement of a manual reset mechanism; and a pushrod connected to the manual reset mechanism and extending through the cylinder and the first wall, wherein, when the hand wheel is rotated manually, the manual reset mechanism is rotated and causes the pushrod to move relative to the piston corresponding to the direction of the rotation of the hand wheel. ### Claim 2 (depends on 1) The spring-applied parking brake according to claim 1, wherein the manual reset mechanism comprises a threaded shaft having a first end slidably connected to a first end of the spindle and a second end connected to the pushrod, and a ball screw nut rotatably engaged with the threaded shaft. ### Claim 3 (depends on 2) The spring-applied parking brake according to claim 2, wherein the ball screw nut is fixedly positioned relative to the piston. ### Claim 4 (depends on 2) The spring-applied parking brake according to claim 2, wherein the threaded shaft is hollow and includes a key slot for slidably engaging a key extending through the spindle. ### Claim 5 (depends on 2) The spring-applied parking brake according to claim 2, wherein the ball screw nut is set within a sleeve connected to the piston. ### Claim 6 (depends on 1) The spring-applied parking brake according to claim 1, wherein the at least one spring is a pair of concentric springs. ### Claim 7 (depends on 1) The spring-applied parking brake according to claim 1, wherein the hand wheel is connected to a gear box having a first bevel gear engaging a second bevel gear. ### Claim 8 (depends on 7) The spring-applied parking brake according to claim 7, wherein the first and second bevel gears have straight or spiral teeth. ### Claim 9 (depends on 1) The spring-applied parking brake according to claim 1, wherein a second end of the spindle has a toothed ratchet releasably engaged to a release pin mechanism. ### Claim 10 (depends on 9) The spring-applied parking brake according to claim 9, wherein the release pin mechanism includes a spring-loaded pullout pin that is selectively engagable with the toothed ratchet. ### Claim 11 (depends on 1) The spring-applied parking brake according to claim 1, wherein hand wheel is connected to a gear box by a shaft having a first shaft portion selectively engagable with a second shaft portion or by selectively engagable gears within the gear box. ### Claim 12 (depends on 11) The spring-applied parking brake according to claim 11, wherein the first shaft portion and the second shaft portion are selectively engagable via a spring-loaded mechanism. ### Claim 13 A parking brake for a railway vehicle comprises: a pneumatic cylinder having a cylinder wall and first wall provided opposite a second wall; a piston movable within the pneumatic cylinder and sealed relative to the cylinder wall; at least one spring extending between the piston and the second wall for biasing the piston against the first wall when the pneumatic cylinder is depressurized; a pneumatic pressure inlet for applying pressure to move the piston against the spring toward the second wall; a manual hand wheel; a spindle operatively connected to the hand wheel to affect movement of a manual reset mechanism having a threaded shaft with a first end slidably connected to a first end of the spindle and a second end connected to the pushrod, and a ball screw nut rotatably engaged with the threaded shaft; and a pushrod connected to the manual reset mechanism and extending through the cylinder and the first wall, wherein, when the hand wheel is rotated manually, the manual reset mechanism is rotated and causes the pushrod to move relative to the piston corresponding to the direction of the rotation of the hand wheel. ### Claim 14 (depends on 13) The parking brake according to claim 13, wherein the threaded shaft is hollow and includes a key slot for slidably engaging a key extending through the spindle. ### Claim 15 (depends on 13) The parking brake according to claim 13, wherein the ball screw nut is fixedly positioned relative to the piston. ### Claim 16 (depends on 13) The parking brake according to claim 13, wherein the ball screw nut is set within a sleeve connected to the piston. ### Claim 17 (depends on 13) The parking brake according to claim 13, wherein the at least one spring is a pair of concentric springs. ### Claim 18 (depends on 13) The parking brake according to claim 13, wherein the hand wheel is connected to a gear box having a first bevel gear engaging a second bevel gear. ### Claim 19 (depends on 13) The parking brake according to claim 13, wherein a second end of the spindle has a toothed ratchet releasably engaged to a release pin mechanism. ### Claim 20 (depends on 13) The parking brake according to claim 13, wherein the hand wheel is connected to a gear box by a shaft having a first shaft portion selectively engagable with a second shaft portion or by selectively engagable gears within the gear box.