Fluid handling – With indicator – register – recorder – alarm or inspection means – Inspection means
Reexamination Certificate
2006-07-21
2008-12-30
Bastianelli, John (Department: 3753)
Fluid handling
With indicator, register, recorder, alarm or inspection means
Inspection means
C251S069000, C251S129120, C251S328000
Reexamination Certificate
active
07469717
ABSTRACT:
A fail-safe shutter (13) for a “cross-stack” monitor, comprises a body member (14) having an aperture (1) through which, in use, an associated monitoring instrument is adapted to sight. A gate (3) is movable between a retracted, open position in which the aperture (1) is exposed, and a closed position in which the aperture (1) is closed-off by a portion of the gate (3), and means are provided to bias the gate (3) towards its closed position. An electric motor (20), a gearbox (19) and a magnetic clutch (16) are provided, the clutch (16), when energised, connecting the gate (3) to the motor (20) via the gearbox (19), and the motor (20), when energised, serving to drive the gate (3) via the gearbox (19) and the energised clutch (16) to an open position, with attainment of the latter de-energising the motor (20) only, and with the bias means (7) being insufficient to overcome the mechanical advantage of the gearbox (19), whereby the gate (3) is retained in its open position until such time as the clutch (16) is de-energised. Control circuitry (21) is provided to maintain and/or interrupt and/or return electrical supply to the clutch, and/or to the electric motor.
REFERENCES:
patent: 828547 (1906-08-01), Hayden
patent: 863180 (1907-08-01), Howard
patent: 916831 (1909-03-01), Bettinger
patent: 2315389 (1943-03-01), Benson et al.
patent: 2738033 (1956-03-01), Towle et al.
patent: 2761331 (1956-09-01), Buescher
patent: 3258985 (1966-07-01), Jordan
patent: 3685790 (1972-08-01), Crowe
patent: 4621789 (1986-11-01), Fukamachi
patent: 4749168 (1988-06-01), Maxwell et al.
patent: 4759529 (1988-07-01), Berger et al.
patent: 4783048 (1988-11-01), St. Clair
patent: 4920811 (1990-05-01), Hopper
patent: 5234196 (1993-08-01), Harris
patent: 6471182 (2002-10-01), McIntosh
Bastianelli John
Land Instruments International Ltd.
Trexler, Bushnell Giangiorgi, Blackstone & Marr, Ltd.
LandOfFree
Fail safe shutter for use with a cross-stack monitor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fail safe shutter for use with a cross-stack monitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fail safe shutter for use with a cross-stack monitor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4046917