Christian M Schaefer

US Patent:

51916894, Mar 9, 1993

Filed:

May 1, 1992

Appl. No.:

7/877406

Inventors:

Raymond J. Slesinski - Arnold MO
Christian E. Schaefer - Glendale MO

Assignee:

McDonnell Douglas Corporation - St. Louis MO

International Classification:

B23P 1100

US Classification:

29243517

Abstract:

A grommet installation device consisting of an installation tool and a backup tool. The backup tool incorporates a retractable rod for guiding and aligning the grommet sleeve throughout installation. The installation tool flares and swages the grommet sleeve over a grommet spacer, affixing the grommet assembly in the workpiece aperture.

US Patent:

20210291281, Sep 23, 2021

Filed:

Mar 17, 2020

Appl. No.:

16/820761

Inventors:

- Chicago IL, US
Kip Ryan Kuldell - St. Charles MO, US
Joseph A. Kaufman - St. Charles MO, US
Christian E. Schaefer - Cottleville MO, US
Russell DeVlieg - Woodinville WA, US
Patrick Dunn - Everett WA, US

Assignee:

THE BOEING COMPANY - Chicago IL

International Classification:

B23B 51/00
B23B 35/00
B25J 11/00

Abstract:

A robotic forming system and method for forming a tapered hole in a workpiece include a housing and a nose extending from the housing. The housing defines an internal chamber. A vacuum gate is in fluid communication with an internal cavity of the nose. A seal is within the nose. A first spindle includes a first operative head. The first spindle is retained within the internal chamber. The first spindle is configured to be moved between a first stowed position within the housing and a first operating position in which the first operative head extends into the nose. The first operative head is configured to form an initial hole within the workpiece. A second spindle includes a second operative head. The second spindle is retained within the internal chamber. The second spindle is configured to be moved between a second stowed position within the housing and a second operating position in which the second operative head extends into the nose. The second operative head is configured to modify the initial hole to form a tapered hole.

US Patent:

20210121940, Apr 29, 2021

Filed:

Oct 29, 2019

Appl. No.:

16/666739

Inventors:

- Chicago IL, US
Christian E. Schaefer - Cottleville MO, US
Jeffrey J. Kilwin - St. Peters MO, US
Tony S. Goddard - Tully NY, US
Thomas E. Burns - Sanborn NY, US
Eugene T. Darlak - Lockport NY, US
Jeffrey L. Foore - Cheektowaga NY, US

International Classification:

B21J 15/14
B21J 15/28
B21J 15/04
B21J 15/50

Abstract:

There is provided an automated rivet apparatus for installing a semi-tubular fastener rivet. The apparatus includes a numerical control (NC) drilling and riveting machine and a controller. The NC drilling and riveting machine includes a lower head having a lower pressure bushing, a lower drill spindle, and a lower anvil to apply an upset force to a tail portion of the semi-tubular fastener rivet. The NC drilling and riveting machine further includes an upper head having an upper pressure bushing, an upper drill spindle, and an upper anvil that holds the semi-tubular fastener rivet to insert the semi-tubular fastener rivet in a rivet-receiving hole. The lower drill spindle countersinks the rivet-receiving hole from a lower side of a workpiece. The controller directs movement of a nose of the lower anvil to apply the upset force and form a predetermined flare contour in the tail portion within a lower countersink.