David H Seaberg

US Patent:

43378366, Jul 6, 1982

Filed:

Sep 26, 1980

Appl. No.:

6/191476

Inventors:

David H. Seaberg - Davenport IA

Assignee:

J. I. Case Company

International Classification:

E02F 376

US Classification:

172826

Abstract:

A linkage arrangement is disclosed for connecting a dozer blade and pushbeams which reduces blade roll-back during lifting thereby making it substantially more difficult for dirt and the like to cling to the blade. The linkage arrangement includes a pair of leveling link assemblies which are mounted to the pushbeams on opposite sides of the tractor frame. An adjustable strut is connected between one of the leveling link assemblies and the upper edge of the blade, and a tilt cylinder is connected between the upper edge of the blade and the opposed leveling link assembly. As the blade is raised, the adjustable strut and corresponding leveling link assembly automatically force the blade into a relatively vertical attitude thereby reducing blade roll-back. Actuation of the tilt cylinder permits the blade to be tilted while the blade is being kept at the vertical attitude established by the leveling link assembly and adjustable strut. Thus, the linkage arrangement forces the blade to a relatively vertical attitude during lifting to prevent blade roll-back while still permitting the blade to be tilted.

US Patent:

42653193, May 5, 1981

Filed:

Dec 7, 1978

Appl. No.:

5/967465

Inventors:

David H. Seaberg - Davenport IA

Assignee:

J. I. Case Company - Racine WI

International Classification:

E02F 376

US Classification:

172811

Abstract:

The blade of an earthworking vehicle is mounted to pushbeams by pivotal L-shaped hinge body connections permitting pivotal movement of the blade about a transverse horizontal axis in the body of the blade. The hinge connections are retained on the forward end of each pushbeam. The connections have a hinge pin leg disposed parallel to the plane of the blade, in the body of the blade, and another leg secured to the forward end of the pushbeam. In the preferred embodiment, the longitudinal axis of the hinge pin leg is disposed inside the body of the blade, between the face and rear wall, thereby reducing the torsional load on the blade and stabilizing the blade. More open space is provided between the tracks and the rear of the blade which reduces the possibility of debris build-up. In an alternate embodiment of the hinge connection between the blade and pushbeams, the longitudinal axis of a hinge pin is located within the body of the blade which stabilizes the blade and provides more open space between the tracks and the back of the blade as in the preferred embodiment.

US Patent:

44716699, Sep 18, 1984

Filed:

Jan 21, 1982

Appl. No.:

6/341414

Inventors:

David H. Seaberg - Davenport IA

Assignee:

J. I. Case Company - Racine WI

International Classification:

F16H 4704
F16H 142

US Classification:

74687

Abstract:

A steering system for a tracked machine having dual power paths to opposed planetary differential gear sets for providing conventional differential steering and a second method of steering where the speed of one track is reduced while keeping the other track at its initial speed. The steering system includes primary and secondary drive inputs into the opposed planetary gear sets. The planetary gear sets combine the rotations from the primary and secondary drive inputs in a first steering mode for increasing the speed of one track while reducing the speed of the other track by an equal amount. A second mode of steering is also possible where the speed of one track is reduced while keeping the other track at its initial speed for larger turning radii. The primary drive input includes a variable displacement fluid pump and a variable displacement motor connected to the planetary gear sets by means of a drive shaft for driving the tracks of the machine. The secondary drive input includes a reversible fluid motor connected to a differential gear assembly with opposed drive shafts and steering mode clutches being connected between the differential gear assembly and planetary gear sets for controlling the steering mode.

US Patent:

40292266, Jun 14, 1977

Filed:

Apr 12, 1976

Appl. No.:

5/675992

Inventors:

David H. Seaberg - Davenport IA

Assignee:

J. I. Case Company - Racine WI

International Classification:

E02F 370

US Classification:

214139

Abstract:

A linkage system for pivotally supporting a boom on a vehicle body with a material handling unit pivoted on the outer end of the boom through a unit fluid ram is disclosed herein. The linkage system consists of an arm that is supported for pivotal movement on the vehicle body with the boom pivoted on the arm at a spaced location. Linkage means interconnect the arm and the boom and the unit fluid ram is pivotally connected to the linkage means. The boom and body have cooperating guide means that guides the movement of the arm between first and second positions so that the moment arm is at a minimum when the boom extends generally parallel to the terrain.

US Patent:

41007387, Jul 18, 1978

Filed:

Mar 17, 1977

Appl. No.:

5/778409

Inventors:

David H. Seaberg - Davenport IA

Assignee:

J. I. Case Company - Racine WI

International Classification:

F16D 3100
F15B 1309

US Classification:

60327

Abstract:

A method and apparatus are disclosed for mechanically steering vehicles such as crawler tractors and the like or skid steer tractors, which include a pair of independently operable power sources. The apparatus includes a pair of independent first linkage systems interconnected between a single operator control lever and each respective power source to achieve equivalent power outputs from the sources upon movement of the lever. A pair of independent second linkage systems are interconnected between respective links in the first linkage system and respective throttling means. In the method, each throttling means may be operated independently of the other to achieve unequal power outputs from the two sources by virtue of the independent first and second linkage systems.

US Patent:

43526268, Oct 5, 1982

Filed:

Dec 22, 1980

Appl. No.:

6/219077

Inventors:

Claude M. Frisbee - Bettendorf IA
David H. Seaberg - Davenport IA

Assignee:

J. I. Case Company - Racine WI

International Classification:

B66C 2300

US Classification:

414722

Abstract:

A locking member is disclosed that is selectively operable to secure the loader boom arms in a raised position for service or repair. The locking member is pivotally connected to a boom arm for movement to an operative position between the boom arm and its respective lift cylinder where it is restrained in compression between the boom arm and lift cylinder to latch the boom arm in a raised position against collapsing movement. The locking member includes a pair of spaced apart, parallel, and aligned mounting plates, each being generally in the form of a right triangle and a generally U-shaped yoke fixed between the mounting plates and extending along opposed corresponding sides of the mounting plates for a part of their length. In the inoperative position of the locking member, one side of the generally U-shaped yoke is held in a substantially abutting relationship with the underside of the boom arm such that the locking member is out of the way where it will not interfere with the normal operation of the boom arm. The locking member is movable to an operative position where the U-shaped yoke abuts against the end of the lift cylinder and straddles the lift cylinder piston rod thereby providing a rigid strut between the lift cylinder and boom arm to support the boom arm in its raised position against collapsing movement.