Movable or removable closures – Closure shiftable to pit or obstacle bridging position
Patent
1991-10-18
1993-03-02
Luebke, Renee S.
Movable or removable closures
Closure shiftable to pit or obstacle bridging position
49 27, 49360, 1372346, E06B 1100
Patent
active
051898365
ABSTRACT:
A system for automatically opening and closing horizontal covers over standard inspection pit. The system comprises two grates mounted on wheels, the wheels engaging two parallel tracks attached to opposite sides of the pit. An electric motor powers the grates upon command to either move away from each other to an open position to expose the pit, or to move toward each other to a closed position to cover the pit. The system is equipped with both audible and visual warning devices which automatically activate upon movement of the grates. Also, the leading edges of the grates have sensors which cause the grates to stop and retract upon detection of a foreign object caught therebetween.
REFERENCES:
patent: 1832232 (1931-11-01), Mimms
patent: 2135131 (1938-11-01), Bassett
patent: 2137196 (1938-11-01), Sampson
patent: 2598196 (1952-05-01), Staley
patent: 2841389 (1958-07-01), Litherland
patent: 3079871 (1963-03-01), Brodie
patent: 3238772 (1966-03-01), Pelliciotti
patent: 3299570 (1967-01-01), Radcliffe
patent: 3475862 (1969-11-01), Ozaki
patent: 3775906 (1973-12-01), Dougherty
patent: 3855733 (1974-12-01), Miller
patent: 3938621 (1976-02-01), Bobbitt
patent: 4188985 (1980-02-01), Osterman
patent: 4284173 (1981-08-01), Patterson
patent: 4301621 (1981-11-01), Houweling
patent: 4301627 (1981-11-01), Houweling
patent: 4464518 (1984-08-01), Duhame
patent: 4464651 (1984-08-01), Duhame
patent: 4503637 (1985-03-01), Parente
patent: 4693340 (1987-09-01), Shanks et al.
patent: 4763937 (1988-08-01), Sittnick et al.
patent: 4785293 (1988-11-01), Shearer et al.
patent: 4789047 (1988-12-01), Knobloch
patent: 4821024 (1989-04-01), Bayha
patent: 4937556 (1990-06-01), Scott et al.
patent: 4960150 (1990-10-01), Ryan
Alder Matt L.
Payzant L. Cliff
Luebke Renee S.
Redman Jerry
LandOfFree
Automated inspection pit cover system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automated inspection pit cover system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automated inspection pit cover system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-119584