Patent ID: 11939188
Assignee: CHR.MAYR GMBH + CO. KG
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 19:
20. A car brake (10) and circuit arrangement for activating a brake function, in particular an emergency braking function of an externally powered car brake (10), which interacts with at least one guide rail (9), of a lift system (AS) according to claim 4,
characterised in that, during emergency braking according to a second strategy, which requires moderate braking forces depending on the friction conditions between guide rail (9) and brake linings (14) and on the loading and direction of travel of the car (2),
the line section (L2) is decoupled from the external energy via the at least one magnetic directional valve (V1, V2) or the at least one switch (SC1, SC2), and thus a first braking force is generated on the guide rail (9) via the brake spring force (30) of the at least one lifting cylinder (21a),
that none or at least one of the line sections (L3, L4, Ln) is decoupled from the external energy simultaneously via the cascade control valves (V5, V6, Vn) or cascade control switches (SC3, SC4, SCn), and thus none or only a reduced second braking force is generated on the guide rail (9),
that the deceleration of the car (2) is measured continuously during emergency braking,
that, when predefined threshold values for the deceleration of the car (2) are exceeded, none or at least one of the control cylinders (21) is supplied with external energy via none or at least one of the cascade control valves (V5, V6, Vn) or via none or at least one of the cascade control switches (SC3, SC4, SCn), and the braking force is reduced, and
that, when the deceleration of the car (2) falls below predefined threshold values, at least one of the control cylinders (21) is disconnected from the external energy via at least one of the cascade control valves (V5, V6, Vn) or at least one of the cascade control switches (SC3, SC4, SCn), and the braking force is increased.