Conveyors: power-driven – Conveyor or accessory therefor specialized to convey people – By stairway having steps forming an endless member
Reexamination Certificate
2006-09-27
2010-12-28
Bidwell, James R (Department: 3651)
Conveyors: power-driven
Conveyor or accessory therefor specialized to convey people
By stairway having steps forming an endless member
C198S333000
Reexamination Certificate
active
07857115
ABSTRACT:
A device (42) useful for working on an escalator (20) provides a tread surface (50) that is obliquely oriented relative to an incline (I) of the escalator (20) during a maintenance or repair procedure. A disclosed example is useful for spanning at least a portion of an escalator (20) where the normal operating steps (22) have been removed for purposes of working on the escalator (20). A disclosed example includes a tread surface (50), a riser portion (52) that is at least partially generally perpendicular to the tread surface (50), a first axle hook (54) and a second axle hook (56). The axle hooks rest upon spaced axles (46) associated with the escalator for positioning a temporary step (44) as desired for facilitating working on the escalator.
REFERENCES:
patent: 3834514 (1974-09-01), Wakamatsu
patent: 4244457 (1981-01-01), Ernst
patent: 4265353 (1981-05-01), Hill
patent: 07215647 (1995-08-01), None
patent: 08059159 (1996-03-01), None
Otis Technical Information Publication, TIP 30.3.1-6 Escalator Service Boards, Use and Upgrade Instructions, May 25, 2006.
International Search Report and Written Opinion of the International Searching Authority for International application No. PCT/US2006/037662 mailed Jun. 6, 2007.
International Preliminary Report on Patentability for International application No. PCT/US2006/037662 mailed Oct. 12, 2008.
Blakelock Richard S.
Buckley Craig A.
Charney Thomas R.
Chicoine Troy R.
LeBrecque Douglas B.
Bidwell James R
Carlson & Gaskey & Olds PC
Otis Elevator Company
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