Alan Craig Doughty

US Patent:

7255330, Aug 14, 2007

Filed:

Jun 9, 2004

Appl. No.:

10/864002

Inventors:

Ernest E. Lutter - Sand Springs OK, US
Paul A. Boeckman - Tulsa OK, US
Alan C. Doughty - Tulsa OK, US

Assignee:

The Crosby Group, Inc. - Tulsa OK

International Classification:

B66D 3/08

US Classification:

254393, 254416

Abstract:

A field adjustable block for use with a bridge crane having a rotating cylindrical drum for rope. The block includes a cylindrical center pin having a key way recess parallel to an axis of the center pin. An inner side plate has an opening therethrough and an extending key receivable in the key way recess to prevent rotation of the inner side plate. Multiple sheaves are receivable over the center pin. At least one toroidal spacer is receivable over the center pin. A lock washer has an inwardly extending key receivable in the key way recess of the center pin and has a plurality of radially extending tabs. A nut has at least one notch to receive one of the extending tabs therein. An outer side plate is removably attached to the inner side plate by fasteners.

US Patent:

7293763, Nov 13, 2007

Filed:

Sep 12, 2005

Appl. No.:

11/162482

Inventors:

Ernest E. Lutter - Sand Springs OK, US
Alan C. Doughty - Tulsa OK, US
Paul A. Boeckman - Tulsa OK, US

Assignee:

The Crosby Group, Inc. - Tulsa OK

International Classification:

B66D 3/04

US Classification:

254415, 403118, 403 78, 403317, 403344, 294 8221

Abstract:

A retaining keeper assembly for a hoisting device. A shank has a plurality of circumferential grooves perpendicular to an axis of the shank. A thrust bearing surrounds the shank and is supported by the hoisting device. A split retaining collar having a plurality of interior circular protrusions mates with the circumferential grooves in the shank to prevent axial movement of the shank. A cylindrical retaining keeper ring having an open top and an open bottom encloses the assembled retaining collar, the keeper ring having an inner diameter slightly larger than an outer diameter of the retaining collar. A pair of retaining rings surround the split retaining collar above and below the keeper ring to trap the keeper ring in place.

US Patent:

7000905, Feb 21, 2006

Filed:

Aug 5, 2003

Appl. No.:

10/634255

Inventors:

Ernest E. Lutter - Sand Springs OK, US
Alan C. Doughty - Sand Springs OK, US
Paul A. Boeckman - Jenks OK, US

Assignee:

The Crosby Group, Inc. - Tulsa OK

International Classification:

B66D 3/04

US Classification:

254415, 403344

Abstract:

A retaining keeper assembly for a hoisting device. A shank has a plurality of circumferential grooves perpendicular to an axis of the shank. A thrust bearing surrounds the shank and is supported by the hoisting device. A split retaining collar having a plurality of interior circular protrusions mates with the circumferential grooves in the shank to prevent axial movement of the shank. A cylindrical retaining collar cover having a closed top and an open bottom encloses the retaining collar, the cover having an inner diameter slightly larger than an outer diameter of the retaining collar. A fastener mechanism fastens the retaining collar cover to the split retaining collar and to the shank.