Tools – Wrench – screwdriver – or driver therefor – Spanner
Patent
1997-10-28
1998-09-15
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Spanner
811247, 811801, B25B 1356
Patent
active
058063846
ABSTRACT:
An emergency shut-off wrench for a fluid gate-valve includes a handle having shank and head portions; a plug for engaging the head portion of the handle, the plug having an engagement surface for coupling rotational movement to a gate of the valve, the gate being rotatable approximately 90.degree. between open and closed positions; and a stop rigidly fixable in projecting relation to the plug for preventing further rotation of the gate beyond a predetermined position thereof when the plug is engaging the gate. The plug is rotatably connected to the head portion and respective dogs make abutting engagement between the plug and the head portion at a predetermined angular orientation with the handle for transmitting torque between the handle and the plug in a magnitude sufficient for rotation of the gate in one direction only. The plug can be threadingly engagable with the head portion. The stop can include a stem member that is eccentrically mounted to the handle and fixably held relative to the handle for adjusting an angular orientation of the gate when the stop contacts the fluid line.
REFERENCES:
patent: 2858710 (1958-11-01), Landwehr et al.
patent: 3398612 (1968-08-01), Batten
patent: 3533315 (1970-10-01), Maeda
patent: 4258595 (1981-03-01), Ramsey
patent: 5193418 (1993-03-01), Benrenfeld
patent: 5392672 (1995-02-01), Larson et al.
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