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This anti-reversing brake functions similarly to an over-running clutch, but during rotation in the unrestricted direction, there is no physical contact between the rotating member and the clutch.
English (United States)
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Anti Reversing Brake
This anti-reversing brake functions similarly to an over-running clutch, but
during rotation in the unrestricted direction, there is no physical contact between
the rotating member and the clutch.
Fig. 1 shows the rotating drum 5 moving in the direction of arrow A with the
clutch disengaged. Fig. 2 shows the clutch engaged as drum 5 moves in the
direction of arrow B. As seen in Fig. 3, the clutch arm 7 is secured to a shaft 8
which pivots in bearings 10 carried by the stationary member 6. Drum 5 carries a
steel ring 11, which is made of material with the appropriate coercivity and which
is in close proximity to a permanent magnet 12 mounted on clutch arm 7. The
clutch arm 7 also carries a friction pad 14 which engages drum wall surface 15.
The stationary member 6 also carries a stop 17 which limits counterclockwise
pivoting of clutch arm 7, as viewed in Figs. 1 and 2.
In operation, when the drum rotates in the direction of arrow A as shown in
Fig. 1, the drag due to magnetic hysteresis between magnet 12 and steel ring 11
pivots clutch arm 7 in a counterclockwise direction into engagement with stop 17.
In this position there is no physical contact between the clutch arm 7 or any part
of the clutch assembly and the rotating drum 5. The only resistance to drum
rotation is the minute magnetic force exerted as the magnet 12 attempts to follow
the steel ring 11. However, when an increment of reverse motion in the direction
of arrow B of Fig. 2 occu...