Abstract:
A plurality of stepchain links (30, 130, 230) of a passenger conveyor system (20) connected to form a continuous loop are from die cast or from stamped or laser cut metal. Each stepchain link (30, 130, 230) includes a plurality of teeth (32, 132, 232) made of a single piece of material that engage a drive member (36). In one example, a plate of injection molded plastic teeth (294) are snapped onto the links to reduce corrosion.
Abstract:
A shock-absorbing hitch termination (40) includes a terminating member (52) that moves against a first bias (62) responsive to a first level of tension on a load bearing member (26) associated with a car (22) and counterweight (24) in an elevator system (20). A support member (60) moves with the terminating members (52) against a second, passive bias (70) responsive to increased tension on the load bearing member (26). In one example, the second bias is provided by mechanical springs (70). In another example the second bias is provided by air springs. In still another example the second bias is provided by pressurized actuators (82). The shock-absorbing hitch termination may be supported for movement with the car, counterweight or both. In another example, the shock-absorbing hitch termination is provided in a stationary structure (90) within the elevator system.
Abstract:
A passenger conveyor drive belt assembly (40) includes a belt support (60) that facilitates proper engagement between the drive belt (42) and corresponding links (32) of a step chain (30) under selected conditions such as a full brake application. The belt support (60) preferably is positioned between a drive sheave (50) and an idler sheave (52) within the loop traveled by the drive belt. The belt support (60) includes at least one moveable support member (62) that does not contact the inner surface of the drive belt during normal operation conditions. In one example, the belt support (60) comprises a plurality of rollers (62).
Abstract:
A passenger conveyor system (20) includes a drive module (40) that engages a step chain (30) to move steps (22) as desired. A non-metallic drive belt (50) includes a unique configuration of teeth (60) that engage teeth (70, 80) of the step chain (30). In one example, the drive belt teeth (60) include a projection (64) that provides the initial engagement point with the step chain teeth (70, 80). In another example, the teeth (60) include a generally concave step chain link teeth engaging surface (62). The inventive arrangement provides smoother, quieter system operation and minimizes the separating forces that otherwise tend to occur between the belt and the step chain links.
Abstract:
An escalator drive assembly includes a backup member (40) that facilitates controlling movement of the escalator (20) even when the normal drive assembly operation is interrupted. A backup member (40) in the form of a flange (42) is associated with a drive pulley (34) and normally rotates in unison with the drive pulley (34). When there is a failure in the normal operation of the drive mechanism, however, there is a resulting relative movement between the backup member (40) and the drive pulley (34). Such relative motion preferably activates a switch (80) that provides a signal that indicates a failure of the normal operation of the drive mechanism. The backup member (40) facilitates providing an indication of a failure and control over movement of the escalator (20) even when the normal drive assembly is not operating as intended.
Abstract:
An escalator drive assembly (30) includes a sensor that facilitates detecting when the normal drive assembly operation is interrupted, such that a brake should be activated. In one example, a sensor member (40) in the form of a flange (42) is associated with a drive pulley (34) and normally rotates in unison with the drive pulley. When there is a failure in the normal operation of the drive mechanism, however, there is a resulting relative movement between the sensor member (40) and the drive pulley (34). Such relative motion preferably activates a switch (80) that provides a signal that indicates a failure of the normal operation of the drive mechanism (30). Another example sensor includes a sensor member (202, 212) that engages a drive belt (35). If the belt (35) breaks, the sensor member (202, 212) moves to provide an indication of the broken belt condition. Various braking application modes are possible using the invention.
Abstract:
An escalator system includes a protective flange assembly along edges of the steps having step flanges. In one example, a first step flange member is adjacent each edge of each step and moves with the step along the escalator path. The first panel member remains stationary relative to the step along the entire path. A second panel member is associated with a corresponding link in the drive chain and remains stationary relative to the link along the entire path of the escalator. The first panel members and second panel members cooperate to provide a continuous barrier along each edge of the steps along the escalator path.
Abstract:
An elevator system (20) includes multiple elevator cars (22, 32) within a hoistway (28). A first compensation member (40) is associated with a first counterweight (24). A second compensation member (50) is associated with a second one of the elevator cars (32). Each compensation member has one end that moves with the associated elevator system component and an opposite end (44, 54) secured in a fixed position within the hoistway. In one example, a compensation member has a linear density that is approximately four times a linear density of a corresponding load bearing member.
Abstract:
An escalator drive machine includes a motor output sheave connected to a drive motor through a belt reduction assembly including a main output sheave. A drive belt extends from the belt reduction assembly and is guided along a plurality of guide sheaves to engage the step chain and propel the escalator tread plates. In addition, by locating a pinch roller adjacent the handrail, the drive belt and handrail can be pinched together to provide a motive force to the handrail. The drive belt thereby synchronously drives the handrail. In another embodiment the drive machine includes a counter-rotating motor to drive a drive belt on each side of the escalator system.
Abstract:
An improved method for mounting elevator rails within a hoistway includes the initial step of securing support brackets to a pair of rails. The brackets, rails, a machine for driving a cab and a dead end hitch are then mounted within the hoistway. A cab may then be moved vertically within the hoistway and additional support brackets are placed at vertically spaced locations. The connection of the brackets and rails provides support to dissipate the loads which are transferred into the rail in such systems wherein the machine or the dead end hitch is fixed to a rail. Once the rails have been adequately supported by additional brackets, the brackets which are secured to the rails are removed from the rail. The brackets provide support, but are no longer fixed to the rails.