Fluid handling – Speed responsive valve control – Centrifugal mass type
Patent
1993-06-23
1994-03-29
Kwon, John T.
Fluid handling
Speed responsive valve control
Centrifugal mass type
251 74, 251297, F16K 3150
Patent
active
052975738
ABSTRACT:
An overspeed safety device for a pneumatic rotation motor comprises a housing (10, 18) and a valve element (28) which is located in a bore (27) in the housing (10, 18) and which by a trip device (29, 31) is locked in a normally open position and arranged to block at least the main part of the air supply to the motor when shifted to a closed position, and an activating device (37, 38) coupled to a rotating part (14) of the motor and arranged to be shifted by inertia forces from a normal rest position to an active position at a predetermined motor speed level. The trip device (29, 31) comprises an open spring wire lock ring (29) pretensioned toward a closed condition and located in a groove (30) in the valve element (28), and a holding device (31) normally located between the ends of the lock ring (29) to maintain the lock ring (29) in an expanded condition in which its outer diameter exceeds the inner diameter of a shoulder (32) in the bore (27). At overspeed, the activating device (37, 38) moves the holding device (31) out of its lock ring (29) expanding position, thereby enabling the latter to contract and release the valve element (28) for movement toward a closed position.
REFERENCES:
patent: 1031294 (1912-07-01), Schutte
patent: 1077503 (1913-11-01), Anderson
patent: 2209135 (1940-07-01), Parker
patent: 2569967 (1951-10-01), Ashton
patent: 2970607 (1961-02-01), Peck et al.
patent: 2977931 (1961-04-01), Schott
patent: 3602479 (1971-08-01), Bowen
patent: 3625479 (1971-12-01), Hammon
patent: 4928919 (1990-05-01), Daicho et al.
Atlas Copco Tools AB
Kwon John T.
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