Braking device for a passenger conveyor

Patent metadata

Field	Value
Publication number	US-9803708-B2
Application number	US-201313944210-A
Country	US
Kind code	B2
Filing date	Jul 17, 2013
Priority date	Nov 9, 2007
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

This invention relates to a braking device ( 10 ) for a passenger conveyor comprising at least one movable part ( 12 ). The braking device ( 10 ) comprises a braking element ( 18 ) having a braking portion ( 34 ) engageable with the movable part ( 12 ) of the passenger conveyor. The braking element ( 18 ) is movable in a first direction into a position in which the braking portion ( 34 ) engages with said movable part ( 12 ) of the passenger conveyor. The braking element ( 18 ), in a state in which the braking portion ( 34 ) engages with the movable part ( 12 ) of the passenger conveyor, is movable in a second direction from a position of initial engagement of the braking portion ( 34 ) into a braking position of the braking element ( 18 ). The movement in the second direction is driven by movement of the movable part ( 12 ) of the passenger conveyor.

First claim

The invention claimed is:

1. A braking device for a passenger conveyor having at least one moveable part comprising at least one projection on a side of the moveable part, the projection projecting away from a surface on the side of the moveable part at least partially in a direction that is generally parallel to an axis of rotation about which the moveable part rotates, the surface being generally perpendicular to the axis of rotation, the braking device comprising:
a braking element having a braking portion that is selectively engageable with the moving part,
the braking element being moveable in a first direction into an engagement position where the braking element engages the projection on the moveable part,
the braking element being moveable in a second, different direction from the engagement position to a braking position, the braking element moving into the braking position responsive to movement of the moveable part urging the braking element toward the braking position,
the braking element blocking movement of the moveable part beyond the braking position once the braking element reaches the braking position, and
a stop member that an abutment surface of the braking element is received against in the braking position, engagement between the stop member and the abutment surface preventing movement of the braking element and the moveable part beyond the braking position,
wherein the braking element comprises a shaft having one end configured to engage the moveable part,
wherein the first direction is aligned with a longitudinal axis of the shaft and the second direction is transverse to the first direction.

2. The device of claim 1 , wherein the braking element moves linearly in the first direction and the braking element pivotally moves in the second direction.

3. The device of claim 2 , wherein the braking element pivotally moves in the second direction about a pivot axis that is parallel with an axis of rotation of the moveable element.

4. The device of claim 1 , wherein an angle between a first orientation of a longitudinal axis of the shaft in the engagement position and a second orientation of the longitudinal axis of the shaft in the braking position is between 10 degrees and 45 degrees.

5. The device of claim 4 , wherein the angle is approximately 25 degrees.

6. A braking device for a passenger conveyor having at least one moveable part with at least one projection on a side of the moveable part, the projection projecting away from a surface of the moveable part at least partially in a direction that is generally parallel to an axis of rotation about which the moveable part rotates, the braking device comprising:
a braking element having a braking portion that is selectively engageable with the moving part,
the braking element being moveable in a first direction into an engagement position where the braking element engages the projection on the moveable part,
the braking element being moveable in a second, different direction from the engagement position to a braking position, the braking element moving into the braking position responsive to movement of the moveable part urging the braking element toward the braking position,
the braking element blocking movement of the moveable part beyond the braking position once the braking element reaches the braking position, and
a stop member that an abutment surface of the braking element is received against in the braking position, engagement between the stop member and the abutment surface preventing movement of the braking element and the moveable part beyond the braking position;
wherein the stop member comprises a wedge shaped portion defining an abutment surface against which the abutment surface of the braking element abuts in the braking position.

7. The device of claim 6 , wherein the abutment surface is defined on a surface of the wedge shaped portion tapering toward the moveable part with respect to the second direction.

8. The device of claim 7 , wherein the abutment surface is inclined with respect to the second direction at an angle between 1 degree and 20 degrees.

Assignees

• Otis Elevator Co

Inventors

• Lazar David
• Vrsecky Martin

Classifications

• F16D63/006 Primary

  Positive locking brakes · CPC title

• B66B29/00

  Safety devices of escalators or moving walkways (walkways of variable speed type B66B21/12; handrails of variable speed type B66B23/26) · CPC title