4.12.(b): When the angle, through which the pin moves within the slot, does not allow contact with the sides of the slot, nothing happens!
4.12.(c): When the brake applies, after some minimal amount of lining wear, the pin will contact the side of the slot in the collar, which will advance the ratcheting mechanism and prepare for adjustment the next time the brake is released.
4.12.(d): When the brake is next released and the load on the thread is minimal, the free wheel
4.12.(e): The ratcheting advancement will continue, a little at a time, until the
4.13: When the brake is released, the shoes are moved apart to provide running clearance from the wheel. The actuator’s active stroke establishes the total clearance available for both shoes.
4.13.(a): As the brake releases, the shoe nearest to the actuator has been biased to open first. This is done during manufacture, by inclining the actuator away from the nearest shoe (See Fig. 2).
4.13.(b): Clearance provided to the nearest shoe is restricted by the (AE) mechanism – located on the base – which transfers the remaining clearance to the other shoe.
4.13.(c): As shoe wear occurs the friction bolt in the (AE) mechanism relocates to provide a new reference point for the brake shoe on the actuator side of the brake.
4.13.(c).(i): The total available shoe clearance is determined by the active stroke.
4.13.(c).(ii): The clearance between the friction bolt and holes in the actuator links through which it passes, determines the “actuator side” shoe clearance.
4.14: Various optional features are available, including latching hand release mechanisms, limit switches, hydraulic and pneumatic overrides, etc. If the brake covered by this manual has any of the optional features, they will be listed on the front page of this manual and covered by supplementary instructions.
4.15: The actuator for this series of Mondel Brakes can be supplied with optional, factory installed time delays.
8/17/2006 | Page 12 of 33 | MST/E Electric Shoe Brakes Manual |
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