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    • 2. 发明授权
      US3804214A Dual braking system for a mining locomotive 失效
    • Dual braking system for a mining locomotive
    • US3804214A
    • 1974-04-16
    • US29251672
    • 1972-09-27
    • NAT MINE SERVICE CO
    • SHOEMAKER L
    • B61H13/22 , B61H13/20
    • B61H13/22
    • The braking system includes mechanically actuated apparatus to move the brake shoes into frictional engagement with the locomotive wheels. The mechanically actuated apparatus has a hand wheel suitably mounted in the operator''s compartment. The hand wheel is connected to one end of a rotatable screw device. The other end of the rotatable screw device is threadedly secured in a threaded bore of a bracket member. The bracket member is secured to a transversely extending equalizer bar. The equalizer bar is connected by a pair of link members to vertically extending brake levers through a lost motion connection. The vertically extending brake levers are pivotally secured to wheel brake assemblies that include a pair of depending hanger levers to which brake shoes are pivotally connected. The brake assembly includes a wear adjustment device to adjust the position of the brake shoes due to wear. Rotation of the hand wheel moves the bracket and equalizer bar longitudinally and through the link members pivots the vertically extending brake levers. The brake levers, in turn, move the brake shoes into frictional engagement with the wheels of the locomotive and apply a braking force thereto. The fluid actuated auxiliary braking apparatus includes a manually operated hydraulic pump in the operator''s compartment connected to a source of hydraulic fluid. The actuating shaft of the pump has a hand wheel connected thereto. One or more piston cylinder servomechanisms are mounted on the locomotive adjacent the equalizer bar with the piston rod connected thereto through suitable overtravel linkages. A check valve assembly is provided to maintain the fluid pressure supplied by the hydraulic fluid pump to the piston cylinder servomechanisms for control of the brake system. The ports of the hydraulic pump are connected by conduits to the inlet ports of the housing of the check valve assembly. The outlet ports of the check valve assembly are connected in turn by conduits to the cylinder on opposite sides of the piston within the cylinder. Rotation of the hand wheel connected to the hydraulic pump in one direction supplies fluid to the piston cylinder assembly to extend the piston rod and move the equalizer bar. The check valve assembly maintains the fluid pressure exerted upon the piston within the cylinder to extend the piston rod. The movement of the equalizer bar moves the brake shoes into frictional engagement with the locomotive wheels through the same linkages associated with the mechanically actuated apparatus. The brake shoes will remain in frictional engagement with the locomotive wheels once the hand brake wheel has been released by operation of the check valve assembly. The rotation of the hand wheel connected to the pump in the opposite direction moves the brake shoes out of frictional engagement with the locomotive wheels. Rotation of the hand wheel in the opposite direction will operate the check valve assembly to release the fluid pressure applied to the piston with the cylinder to retract the piston rod and move the equalizer bar. The amount of frictional force exerted by the brake shoes when actuated by the fluid actuated auxiliary braking system is accurately and positively controlled by operation of the check valve assembly in maintaining fluid pressure supplied by the hydraulic fluid pump.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 3. 发明授权
      US3750852A Dual braking system for a mining locomotive 失效
    • Dual braking system for a mining locomotive
    • US3750852A
    • 1973-08-07
    • US3750852D
    • 1971-10-29
    • NAT MINE SERVICE CO
    • SHOEMAKER L
    • B61H13/22 , B61H13/20
    • B61H13/22
    • The braking system includes mechanically actuated apparatus to move the brake shoes into frictional engagement with the locomotive wheels. The mechanically actuated apparatus has a hand wheel suitably mounted in the operator''s compartment. The hand wheel is connected to one end of a rotatable screw device. The other end of the rotatable screw device is threadedly secured in a threaded bore of a bracket member. The bracket member is secured to a transversely extending equalizer bar. The equalizer bar is connected by a pair of link members to vertically extending brake levers through a lost motion connection. The vertically extending brake levers are pivotally secured to wheel brake assemblies that include a pair of depending hanger levers to which brake shoes are pivotally connected. The brake assembly includes a wear adjustment device to adjust the position of the brake shoes due to wear. Rotation of the hand wheel moves the bracket and equalizer bar longitudinally and through the link members pivots the vertically extending brake levers. The brake levers, in turn, move the brake shoes into frictional engagement with the wheels of the locomotive and apply a braking force thereto. The fluid actuated auxiliary braking apparatus includes a manually operated hydraulic pump in the operator''s compartment connected to a source of hydraulic fluid. The actuating shaft of the pump has a hand wheel connected thereto. One or more piston cylinder servomechanisms are mounted on the locomotive adjacent the equalizer bar with the piston rod connected thereto through suitable overtravel linkages. The ports of the hydraulic pumps are connected by conduits to the cylinder on opposite sides of the piston within the cylinder. Rotation of the hand wheel connected to the hydraulic pump in one direction supplies fluid to the piston cylinder assembly to extend the piston rod and move the equlizer bar. Movement of the equalizer bar moves the brake shoes into frictional engagement with the locomotive wheels through the same linkages associated with the mechanically actuated apparatus. The rotation of the hand wheel connected to the pump in the opposite direction moves the brake shoes out of frictional engagement with the locomotive wheels. The amount of frictional force exerted by the brake shoes when actuated by the fluid actuated auxiliary braking system may be easily, accurately and positively controlled.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
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