Elevator brake
First Claim
1. A brake for an elevator comprising:
- a rotatable portion to be braked;
at least one brake lever having a brake shoe for applying a force to said portion of the elevator brake; and
a torque-measuring means connected to said brake lever for measuring an elastic deformation of said brake lever during an application of said force to said portion of the elevator brake through said brake shoe.
1 Assignment
0 Petitions
Accused Products
Abstract
A torque-measuring device for an elevator brake measures the elastic deformation of active parts of a brake, for example, a shoe brake. In that case, regions with a reduced bending moment resistance are formed at the brake levers and elastically deform under the action of braking torque. The elastic deformation is detected by strain gauge strips arranged in these regions and connected as a measuring bridge and the generated voltage signals are provided to an elevator control as reference signals by an analog-to-digital converter and a microprocessor. The elevator control uses these reference signals to generate in a drive motor a motor torque compensating for the measured torque before the release of the brake. Thus, the resulting torque at the brake shaft is zero and a jerk-free start of the elevator car, without a torque jump, results therefrom after release of the brake.
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Citations
10 Claims
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1. A brake for an elevator comprising:
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a rotatable portion to be braked;
at least one brake lever having a brake shoe for applying a force to said portion of the elevator brake; and
a torque-measuring means connected to said brake lever for measuring an elastic deformation of said brake lever during an application of said force to said portion of the elevator brake through said brake shoe. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A brake for an elevator comprising:
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a rotatable portion to be braked;
a pair of brake levers each having a brake shoe for applying a force to said portion of the elevator brake; and
a torque-measuring means mounted to each said brake lever for measuring an elastic deformation of said brake levers during an application of said force to said portion of the elevator brake. - View Dependent Claims (9, 10)
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Specification