Bruce A Roorda, 681905 W Olive St, Marshalltown, IA 50158
Bruce Roorda Phones & Addresses
1905 W Olive St, Marshalltown, IA 50158
Nokomis, FL
909 Lincoln St, Pella, IA 50219
1005 Columbus St, Pella, IA 50219
1500 Edgewood Dr, Pella, IA 50219
Sarasota, FL
Mentions for Bruce A Roorda
Publications & IP owners
Us Patents
Rock Borehole Shear Tester
US Patent:
4075885, Feb 28, 1978
Filed:
Feb 23, 1977
Appl. No.:
5/771360
Inventors:
Richard L. Handy - Des Moines IA
Leon E. Girard - Ames IA
Bruce R. Roorda - Marshalltown IA
John M. Pitt - Woodridge VA
Leon E. Girard - Ames IA
Bruce R. Roorda - Marshalltown IA
John M. Pitt - Woodridge VA
Assignee:
Iowa State University Research Foundation, Inc. - Ames IA
International Classification:
E21B 4900
US Classification:
73 88E
Abstract:
An expansible shear head device within a pulling cradle is lowered into a bore hole; and the device is expanded hydraulically to exert a predetermined normal pressure on the side walls of the bore hole. The pressure plates of the device are ribbed for permitting interlocking with the rock. Vertical shear stress is exerted on the rock by pulling on the device. The shear head includes a body having a plurality of hinge points, and is laterally expansible. A laterally extendible plunger with a movable shear plate is mounted opposite to a similar shear plate which is secured to permit some deflection of the body about its hinge points from its normal parallel configuration as the shear force moves the body through the bore. The body is locked in its normal parallel configuration until the shear force is applied.
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