The lock has one shackle that secures the lock to the luggage or luggage handle while the other shackle secures the luggage closure or zipper.

A chain link (12) of a step chain (10) for endlessly connecting steps (3) has a fixed link (12a) and a movable link (12b).

The fixed link (12a) connects a rear section fixation position (13a) near a rear wheel (5) and an intermediate section fixation position (13b) between a front wheel (4) and the rear wheel.

The second link is pivotable about the second fixed pivot to pivot the first link about the first fixed pivot.

Each pin (4) is fixed relative to the inner link (1).

Pivoting of the second link about the second fixed pivot may disengage the first link from an extendable member.

The lock has one shackle that secures the lock to the luggage or luggage handle while the other shackle secures the luggage closure or zipper.

A medical instrument lockout comprises a slidable linkage having a first link and a second link, and a first fixed pivot and a second fixed pivot.

The master link may also have a shoe (24) fixedly connected to the first half link member at a first tapered protrusion (51) and fixedly connected to the second half link member at a second tapered protrusion (51).

The spring may be deflected by the first link when the second link pivots about the second fixed pivot to disengage the lock.

A chain link (12) of a step chain (10) for endlessly connecting steps (3) has a fixed link (12a) and a movable link (12b).

The link is attached to a belt (5) and engages adjacent links (1', 1') in order to form a chain (39).

At least one connection hole can be provided in the base plate and the tie-bar with the chain link creates a possible connection for a power conducting chain at a fixed or moveable point.

The master link may have a first half link member (41), a second half link member (42), and a pin (45) joining the first and second half link members.

A track link (50, 52) has a link body.