Viscous coupling with stepped torque curve

Details Viscous coupling with stepped torque curve Viscous coupling with stepped torque curve

1997-05-21

1999-03-16

Young, Lee W.

Brakes

Internal-resistance motion retarder

Using a rotary-type fluid damper

192 5841, 92123, F16D 5702

Patent

active

058818499

ABSTRACT:
The invention relates to a viscous coupling particularly suitable as a brake for a firebreak door. Outer plates are non-rotatably associated with a housing by means of teeth. Between each two outer plates there is arranged one of two inner plates, which are non-rotatably connected to a hub rotatably arranged in the housing by teeth. The other inner plate is connectable in the direction of rotation to the first inner plate and to each other by two sets of lugs such that there is a free rotational path. When the lugs of two successive inner plates contact one another in the direction of rotation, a driving action occurs. Consequently, torque increases in a stepwise fashion. Therefore, it is possible for firebreak doors to affect the braking of movement into a closed position because braking is delayed and changes in steps.

REFERENCES:
patent: 4925409 (1990-05-01), Johnson
patent: 5232075 (1993-08-01), Mohan

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