ROBERT G MCCRACKEN
Engineering in Des Moines, IA
License number
Massachusetts 34671
Issued Date
Jun 23, 1989
Expiration Date
Jun 30, 2018
Type
Civil Engineer
Address
Address
2
Des Moines, IA 50323
Des Moines, IA
Des Moines, IA
Professional information
Reduced Friction Coupling For Shoring Apparatus
US Patent:
6941708, Sep 13, 2005
Filed:
Jul 3, 2003
Appl. No.:
10/613715
Inventors:
Robert McCracken - Des Moines IA, US
Bob Jennings - Des Moines IA, US
Chris Beranek - Des Moines IA, US
Bob Jennings - Des Moines IA, US
Chris Beranek - Des Moines IA, US
Assignee:
Wilian Holding Co. - Des Moines IA
International Classification:
E04D015/00
US Classification:
521261, 521266, 521267, 248161
Abstract:
A reduced friction coupling which interconnects a lower, supporting member and an upper, supported member of a concrete forming apparatus to reduce the force required to lower the height of the forming apparatus under load on the members by a formed concrete structure. Two or more polymeric washers are received about the supporting member between a threaded nut which is used for adjusting the height of the forming apparatus and the supported member. The polymeric washers reduce by a surprising amount the force required to retract the nut under load. Washers of molybdenum disulphide filled nylon can support up to 10,000 pounds per square inch and reduce the force required to retract the nut by at least sixty percent under such a load compared to the force required if a single steel washer is used.
Tie Rod Bearing Unit For Use In Concrete Form Assemblies
US Patent:
5137250, Aug 11, 1992
Filed:
Jan 5, 1990
Appl. No.:
7/461163
Inventors:
Robert G. McCracken - Des Moines IA
Assignee:
Economy Forms Corporation - Des Moines IA
International Classification:
E04G 17065
US Classification:
249 40
Abstract:
A tie rod bearing unit for use in connecting together a pair of oppositely facing wall form structures of a concrete form assembly including upright structural beams with spaced-apart, back-to-back channel members, each of which has a pair of transversely opposite leg sections and an interconnecting web section. The tie bearing unit includes a bearing plate from a first side of which projects an open box member. In position against a beam, the box member of the tie bearing unit is in a friction fit with the web sections within the space between the channel members and the first side of the bearing plate is in contact engagement with the leg sections of the beam. A tie rod of the form assembly bears against the opposite or second side of the bearing plate. The tie rod bearing unit strengthens the beam and distributes the forces exerted by the tie rod.
Method Of Assembling A Shore Post Leg Assembly
US Patent:
7761967, Jul 27, 2010
Filed:
May 11, 2006
Appl. No.:
11/432076
Inventors:
Robert McCracken - Urbandale IA, US
Assignee:
Wilian Holding Company - Des Moines IA
International Classification:
B23P 11/00, E04G 25/04
US Classification:
29434, 29515, 29516, 29517, 295221, 2483541, 2483545
Abstract:
A method of assembling a metal shore post of a concrete forming assembly is disclosed. An outer telescoping tube is provided that has a main section with a first inside diameter and top portion with a section having a second inside diameter reduced relative to the first inside diameter of the outer tube. An inner telescoping tube is inserted for telescopic movement inside the outer tube. After assembly, a pair of pistons are inserted through access holes in the outer tube to provide a crushing force to the inner tube deforming it to create a region of increased diameter that is greater than that of the reduced diameter section but not so large as to prevent telescopic movement of the inner tube inside the outer tube. The increased dimension region thereby prevents accidental separation of the inner tube from the assembly, thereby improving safety and efficiency. Openings are provided in the inner tube in the region being crushed in order to control the region of deformation.
Shore Post Leg Assembly
US Patent:
2010031, Dec 16, 2010
Filed:
Jun 17, 2010
Appl. No.:
12/817970
Inventors:
Robert McCracken - Urbandale IA, US
International Classification:
E04G 17/14, E04G 17/04
US Classification:
249 24
Abstract:
A a metal shore post of a concrete forming assembly is disclosed. An outer telescoping tube is provided that has a main section with a first inside diameter and top portion with a section having a second inside diameter reduced relative to the first inside diameter of the outer tube. An inner telescoping tube is inserted for telescopic movement inside the outer tube. After assembly, a pair of pistons are inserted through access holes in the outer tube to provide a crushing force to the inner tube deforming it to create a region of increased diameter that is greater than that of the reduced diameter section but not so large as to prevent telescopic movement of the inner tube inside the outer tube. The increased dimension region thereby prevents accidental separation of the inner tube from the assembly, thereby improving safety and efficiency. Openings are provided in the inner tube in the region being crushed in order to control the region of deformation.
Concrete Form Panel Having Access Openings
US Patent:
2002011, Aug 29, 2002
Filed:
Feb 24, 2001
Appl. No.:
09/792271
Inventors:
Robert McCracken - Urbandale IA, US
International Classification:
E04G009/00, E04G017/06, E04G011/06
US Classification:
249/044000, 249/189000
Abstract:
Concrete form panels having a plurality of openings in the exterior flange and crossing interior ribs that provide access from an opening in the exterior flange to any interior section between the ribs. Wires, plumbing, and the like are run through the openings to reach any desired area of the back side of the panel while remaining wholly inside the confines of the form panel, thus reducing the likelihood of the wires or plumbing interfering with workers and equipment in the area behind the form panel. In combination with a backside cover, the openings create a plenum through which a fluid, such as heated or cooled air, is passed over the form to assist in the control of the temperature of concrete curing adjacent the form panel.
Concrete Form Using Face Sheet As Tension Flange For Stiffeners
US Patent:
2002015, Oct 31, 2002
Filed:
Feb 23, 2001
Appl. No.:
09/792745
Inventors:
Robert McCracken - Des Moines IA, US
International Classification:
E04G011/06, E04G009/00
US Classification:
249/189000, 249/033000
Abstract:
Metal concrete form panels having a face sheet to which is attached a rearwardly extended perimeter flange. Stiffeners on the back side of the face panel are to the back side of the face sheet and are arranged so that pressure on the front of the face sheet induces a tensile force in the face sheet.
Clamp For Interconnecting Components Of Concrete Forming Apparatus
US Patent:
2006020, Sep 21, 2006
Filed:
Mar 14, 2006
Appl. No.:
11/374772
Inventors:
Robert McCracken - Urbandale IA, US
International Classification:
E04G 9/00
US Classification:
249192000
Abstract:
A clamp for interconnecting two components of a concrete forming apparatus such as metal form panels. A pivoting jaw is mounted around a pivot axis defined by a wedge for pivotal movement into and out of clamping engagement with a fixed jaw. A tooth or projection on a jaw engages corresponding alignment openings in the two form components to position and then hold the form components in the desired relationship.
Spanning Member With Convoluted Web, C-Shape Flanges, And End Plate
US Patent:
2003016, Sep 11, 2003
Filed:
Jun 18, 1999
Appl. No.:
09/336207
Inventors:
ROBERT G. MCCRACKEN - DES MOINES IA, US
International Classification:
E04C003/02, E04C003/30, E04H012/00
US Classification:
052/690000, 052/696000
Abstract:
A spanning or beam member for use in construction having a pair of opposing C-shaped flanges and a corrugated web. Laterally extended protrusions of the web strengthens the beam member by stiffening the web and increasing the load bearing forces that may be carried by the beam member without crushing. The C-shape of the flanges allows welding of the flanges to the protrusions of the web to reduce the unbraced and unstiffened size of the compression elements to allow for construction of beam members of a given strength out of thinner sheet material. An end plate secures to the opposing flanges and to the corrugated web interposed therebetween, providing a superior means for interconnecting the beam members.
Beam Member
US Patent:
D347701, Jun 7, 1994
Filed:
Feb 6, 1992
Appl. No.:
7/832758
Inventors:
Robert G. McCracken - Des Moines IA
Assignee:
Wilian Holding Company - Des Moines IA
US Classification:
D25126
Wing Nut
US Patent:
D510260, Oct 4, 2005
Filed:
Jul 8, 2003
Appl. No.:
29/186045
Inventors:
Bob Jennings - Des Moines IA, US
Robert McCracken - Des Moines IA, US
Robert McCracken - Des Moines IA, US
Assignee:
Wilian Holding Company - Des Moines IA
International Classification:
0808
US Classification:
D 8398