US 5,487,450 A · Braking apparatus and method for a rail-bound carriage of an inclined or vertical elevator

Abstract

An apparatus and method for braking a carriage which travels on rails of an inclined or vertical elevator. The elevator includes a cable driving device having cables connected to the carriage for moving the carriage along the rails. The carriage has a main frame assembly and a movable frame assembly, mounted to slide along the main frame assembly. The braking device comprises a cam disk assembly having eccentric disks rotatably mounted to the movable frame assembly and held in a first position at a predetermined distance away from a surface of each of the rails for frictionally engaging the rails when released from the first position. The cam disk assembly then causes a plurality of brake blocks of the brake device to engage frictionally the rails when the eccentric disks frictionally engage the rails. A first releasing device causes the eccentric disks to release from the first position and engage frictionally the rails when at least one of the cables breaks. Moreover, a second releasing device causes the eccentric disks to release from the first position and engage frictionally the rails when the carriage travels above a predetermined speed. Finally, at least one shock absorber damps relative movement between the movable frame assembly and the main frame assembly, when the brake blocks engage the rails, to stop movement of the carriage along the rails.

Claims15

Dependent claims

A braking apparatus for a carriage which travels on rails of an inclined or vertical elevator, said elevator including a cable driving device having cables connected to the carriage for moving the carriage along the rails, said carriage having a main frame assembly and a movable frame assembly slidably mounted to said main frame assembly, said braking apparatus comprising:

a cam disk assembly, rotatably mounted to said movable frame assembly and having eccentric disks releasibly held in a first position at a predetermined distance away from a surface of each of said rails for frictionally engaging said rails when released from said first position;
a plurality of brake blocks, said cam disk assembly causing said brake blocks to engage frictionally said rails when said eccentric disks frictionally engage said rails;
a releasing device for causing said eccentric disks to release from said first position and engage frictionally said rails when at least one of the following occurs:
at least one of said cables breaks;
and
said carriage travels above a predetermined speed;
and
at least one shock absorber for damping relative movement between said movable frame assembly and said main frame assembly, when said brake blocks engage said rails, to stop movement of said carriage along said rails.

5 more elements

first means, rotatably mounted to said movable frame assembly and being releasibly held in a first position at a predetermined distance away from a surface of each of said rails, for frictionally engaging said rails when released from said first position;
second means for, based on a position of said cam disk assembly, frictionally engaging said rails when said first means frictionally engages said rails;
means for causing said first engaging means to release from said first position and engage frictionally said rails when at least one of the following occurs:
at least one of said cables breaks;
and
said carriage travels above a predetermined speed;
and
means for damping relative movement between said movable frame assembly and said main frame assembly, when said second engaging means engages said rails, to stop movement of said carriage along said rails.

5 more elements

Dependencies are inferred from the claim text.

Braking apparatus and method for a rail-bound carriage of an inclined or vertical elevator

Life of this patent

Braking apparatus and method for a rail-bound carriage of an inclined or vertical elevator

Life of this patent

Abstract

Claims15