Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1992-08-07
1994-05-31
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
72455, 298891, B21D 501
Patent
active
053158563
ABSTRACT:
An apparatus for straightening a propeller has an arbor press with two opposed inner surfaces. The opposed surfaces are spaced apart a sufficient distance to allow a propeller to fit between them with one opposed surface extending beyond the second opposed surface. Two pads are mounted on the first inner surface to support the propeller during the straightening procedure. One or both of the pads may be adjustable to more precisely locate the points of pressure that will be applied to the propeller to straighten it. A ram is mounted on the second inner surface to apply pressure to the propeller. A reinforcing ridge may be attached to the outer surface of the arbor press to provide rigidity during the propeller straightening procedure. To allow precision manipulation of the device under water, a floatation collar is fixed to the arbor press or the reinforcing ridge. The floatation has sufficient buoyancy to counteract the weight of the apparatus when under water. To prevent instability in the apparatus when under water, the floatation collar is positioned so that the center of buoyancy substantially coincides with the center of gravity. In one embodiment, a pair of reinforcing ridges and a cover may be used to define a water-tight enclosure. The pair of ridges provide reinforcement and the water-tight enclosure provides additional buoyancy. In operation, a single diver may manipulate the apparatus so that a bent portion of the propeller is between the opposed inner surfaces of the arbor press so that one side of the propeller rests against the pads. The ram is activated and the piston head of the ram applies pressure to the other side of the propeller to straighten the propeller. The apparatus may be manipulated by a single diver and eliminates the need for dry-docking a ship to straighten the propeller thus reducing the cost of repair and speeding up the repair process.
REFERENCES:
patent: 3990291 (1976-11-01), Evertz et al.
patent: 4671094 (1987-06-01), Break
patent: 5022248 (1991-06-01), Brooks et al.
"Hydraulic Presses", Hannifin Corp., Oct. 22, 1947 Bulletin No. 60-B, 4 pages.
Jones David
Lips Propellers, Inc.
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