Self-adjusting brake incorporating wear compensation
First Claim
1. Brake comprising two pivoting arms for applying brake pads to a member to be braked, a piston-and-cylinder actuator comprising a cylinder member and a piston member, one of the cylinder and piston members being coupled to one of said arms and the other of the piston and cylinder members being coupled to the other arm, brake application means connected to one chamber of said actuator to urge the piston member in one direction, brake release means connected to another chamber of said actuator to urge said piston member in the opposite direction, an electrical switch having two parts, one of the parts of said electrical switch being movable with one member of said actuator and the other of the parts being movable with the other member of said actuator, and a lost-motion coupling means in a linkage between one switch part and the corresponding actuator member, said lost-motion coupling means comprises two telescopic rods, one of said telescopic rods carrying a pin and another of the telescopic rods incorporating a slot, the pin being engaged in the slot, and position sensing means between said rods, said sensing means incorporating said lost-motion coupling means.
1 Assignment
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Accused Products
Abstract
A brake comprises two pivoting arms adapted to apply brake shoes to a member to be braked, a disk, for example, and a piston-and-cylinder actuator with one member, either the cylinder or the piston, coupled to one of the arms and the other member coupled to the other arm. A brake application device connected to one chamber of the actuator urges the piston in one direction and a brake release device connected to the other chamber urges the piston in the opposite direction. An electrical switch has two parts of which one is adapted to move with one part of the actuator and the other is adapted to move with the other part of the actuator. A lost-motion coupling is provided between one part of the electrical switch and the associated part of the actuator.
21 Citations
22 Claims
- 1. Brake comprising two pivoting arms for applying brake pads to a member to be braked, a piston-and-cylinder actuator comprising a cylinder member and a piston member, one of the cylinder and piston members being coupled to one of said arms and the other of the piston and cylinder members being coupled to the other arm, brake application means connected to one chamber of said actuator to urge the piston member in one direction, brake release means connected to another chamber of said actuator to urge said piston member in the opposite direction, an electrical switch having two parts, one of the parts of said electrical switch being movable with one member of said actuator and the other of the parts being movable with the other member of said actuator, and a lost-motion coupling means in a linkage between one switch part and the corresponding actuator member, said lost-motion coupling means comprises two telescopic rods, one of said telescopic rods carrying a pin and another of the telescopic rods incorporating a slot, the pin being engaged in the slot, and position sensing means between said rods, said sensing means incorporating said lost-motion coupling means.
- 12. Brake comprising two pivoting arms for applying brake pads to a member to be braked, a piston-and-cylinder actuator comprising a cylinder member and a piston member, one of the cylinder and piston members being coupled to one of said arms and the other of the piston and cylinder members being coupled to the other arm, brake application means connected to one chamber of said actuator to urge the piston member in one direction, brake release means connected to another chamber of said actuator to urge said piston member in the opposite direction, an electrical switch having two parts for controlling the brake release means, one of the parts of the switch being movable with one of said actuator members and the other of the parts of the switch being movable with the other of said actuator members and a linkage between a said switch part and a corresponding said actuator member, said linkage including a lost-motion coupling means, an automatic brake wear compensating means disposed between a first one of said switch parts and a first one of said actuator members, said compensating means comprising a sliding connection and associated friction gripping means.
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21. Brake comprising two pivoting arms for applying brake pads to a member to be braked, a piston-and-cylinder actuator comprising a cylinder member and a piston member, one of the cylinder and the piston members being coupled to one of said arms and the other of the piston and cylinder members being coupled to the other arm, brake application means connected to one chamber of said actuator to urge the piston member in one direction, brake release means connected to another chamber of said actuator to urge said piston member in the opposite direction, an electrical switch having two parts, one of the parts of the switch being movable with one of said actuator members and the other of said switch parts being movable with the other of said actuator members, and a linkage between a said electrical switch part and a corresponding said actuator member, said linkage including a lost-motion coupling means, and a ball-joint means disposed in said linkage between a said electrical switch part and a corresponding actuator member.
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22. Brake comprising two pivoting arms for applying brake pads to a member to be braked, a piston-and-cylinder actuator comprising a cylinder member and a piston member, one of the cylinder and the piston members being coupled to one of said arms and the other of the piston and cylinder members being coupled to the other arm, brake application means connected to one chamber of said actuator to urge the piston member in one direction, brake release means connected to another chamber of said actuator to urge said piston member in the opposite direction, an electrical switch having two parts, one of the parts of the switch being movable with one of said actuator members and the other of said switch parts being movable with the other of said actuator members, and a linkage between a said electrical switch part and a corresponding said actuator member, said linkage including a lost-motion coupling means, and a motor-driven pump for supplying fluid under pressure to the other chamber of said actuator, and a control circuit including a relay for supplying power to said motor-driven pump and including, connected in series, said electrical switch and an electrical contact operated by a latching pushbutton.
Specification