Donald Eugene Luebrecht

US Patent:

45430314, Sep 24, 1985

Filed:

Apr 22, 1983

Appl. No.:

6/487626

Inventors:

Donald Luebrecht - Fort Jennings OH
Nicholas D. Thobe - Celina OH

Assignee:

Crown Controls Corporation - New Bremen OH

International Classification:

B66F 914
B60P 134

US Classification:

414631

Abstract:

In a material handling vehicle having an operator platform, a sideshift carriage mounted for lateral movement relative to the platform, a traverse carriage mounted for lateral movement relative to the sideshift carriage and forks mounted to the traverse carriage, an improved sideshift control system monitors the position of the sideshift carriage to define home positions for the sideshift carriage relative to the platform. Two home positions are defined, one for the forks facing to each side of the vehicle. The home positions offset the sideshift carriage to one or the other side of the platform to substantially center the load on the vehicle such that a portion of the base of the forks extends a set distance beyond one side of the platform, and the load supported on the forks extends approximately an equal distance beyond the opposite side of the platform. Two electrical switches are mounted approximately at the center of the platform opposite to the sideshift carriage and an activating plate includes two projections which operate alternate ones of the two switches dependent upon the direction the sideshift carriage is extended. A variety of actuating plates conveniently change the home positions and, hence, the preferred load carrying position of the forks for selected applications.

US Patent:

45522502, Nov 12, 1985

Filed:

Apr 22, 1983

Appl. No.:

6/487625

Inventors:

Donald Luebrecht - Fort Jennings OH

Assignee:

Crown Controls Corporation - New Bremen OH

International Classification:

B66B 920
B66B 702

US Classification:

187 9E

Abstract:

A lift truck having a frame and a two-stage telescopic mast in which an outer, movable mast is mounted to telescope over an inner mast which is fixed to the frame, each mast having a substantially continuous, unitary tubular body which provides superior strength characteristics in response to torsional loads and bending moments. The masts each include vertically extending beams, integral with the tubular bodies thereof, having tracks to receive rollers mounted to the beams so that the only contact between the masts is by the rollers. The beams of the outer mast include tracks which receive the rollers of a platform having a lifting fork structure and which is vertically movable relative to the outer mast.

US Patent:

61356948, Oct 24, 2000

Filed:

Sep 29, 1998

Appl. No.:

9/163057

Inventors:

Allen T. Trego - New Bremen OH
Daniel C. Magoto - Russia OH
Donald E. Luebrecht - Fort Jennings OH

Assignee:

Crown Equipment Corporation - New Bremen OH

International Classification:

B66F 916
B66F 920

US Classification:

414 21

Abstract:

A fork lift truck includes a body, a drive mechanism supported on the body for effecting movement of the body, and a fork carrying assembly carrying forks which can be moved in height between a lowered position and desired raised positions. A tilt cylinder is provided for tilting the forks through a fork tilt range. The truck further includes a pressure sensor capable of generating signals indicative of the weight of a load on the forks, a fork tilt position sensor capable of being activated when the forks are tilted to extremes of the fork tilt range, and a controller. The controller is coupled to the drive mechanism, the pressure sensor and the fork tilt position sensor. It causes the drive mechanism to effect movement of the body up to a first maximum speed when at least one of the pressure sensor generates a signal indicative of a load on the forks having a weight above a predetermined value and the tilt position sensor is activated, and causes the drive mechanism to effect movement of the body up to a second maximum speed which is greater than the first maximum speed when the pressure sensor generates a signal indicative of no load or a load on the forks having a weight below the predetermined value and the tilt position sensor is inactivated. The lowering speed of the forks can also or alternatively be increased under the same operating conditions.

US Patent:

44999712, Feb 19, 1985

Filed:

Apr 22, 1983

Appl. No.:

6/487533

Inventors:

Donald Luebrecht - Fort Jennings OH
Kim A. Klopfleisch - St. Marys OH

Assignee:

Crown Controls Corporation - New Bremen OH

International Classification:

B66B 920

US Classification:

187 9R

Abstract:

An improved system for monitoring lift chains included within mast assemblies in material handling vehicles disables downward movement of the forks upon detection of a first level of slackness in a lift chain. Since upward movement of the forks is not disabled, the forks may be raised to clear any obstruction causing the chain slackness. A lift chain may also be monitored to detect a broken chain in which case all vertical movement of the forks is disabled. In a material handling vehicle wherein the operator is elevated along a first mast and the forks are elevated along a second mast connected to an operator's platform, dual lift chains in the first mast are individually monitored for both slackness and breakage while dual lift chains in the second mast are monitored in common primarily to detect slackness. Lateral and rotational movement of the forks is also disabled for detection of a slack or broken first mast lift chain, but not for detection of a slack or broken second mast lift chain.

US Patent:

20100242866, Sep 30, 2010

Filed:

Feb 19, 2010

Appl. No.:

12/708625

Inventors:

Juergen Buchmann - Duisburg, DE
Dean E. Davis - Troy OH, US
Derek M. Gamertsfelder - St. Marys OH, US
Jason R. Kremer - New Bremen OH, US
Donald E. Luebrecht - Ft. Jennings OH, US
Joerg Nellen - Moers, DE
Nicholas J. Stein - Celina OH, US

Assignee:

CROWN EQUIPMENT CORPORATION - New Bremen OH

International Classification:

F01P 3/18
F28D 15/00

US Classification:

123 4149, 16510419

Abstract:

A work vehicle is provided comprising: a main frame including an engine compartment; an engine located in the engine compartment; and a cooling system comprising a rotating fan apparatus and a cooling assembly. The cooling assembly may comprise a heat exchanger for transferring energy in the form of heat from a coolant fluid to air and a filter apparatus positioned adjacent an engine-compartment side of the heat exchanger. The air may be moved through the heat exchanger by the fan apparatus. The filter apparatus may filter the air before the air passes through the heat exchanger. The filter apparatus may comprise filter structure and a suction device for removing debris from the filter structure. The suction device preferably expels the debris outside of the engine compartment.

US Patent:

20070261908, Nov 15, 2007

Filed:

May 11, 2007

Appl. No.:

11/747333

Inventors:

Ryan Berger - Columbus OH, US
Michael Gallagher - Greenville OH, US
John Jones - Celina OH, US
Thornton Lothrop - Worthington OH, US
Donald Luebrecht - Ft. Jennings OH, US
Rainer Teufel - Worthington OH, US
Juergen Buchmann - Duisburg, DE
Edgar Wahnemuehl - Duisburg, DE

Assignee:

CROWN EQUIPMENT CORPORATION - New Bremen OH

International Classification:

B60K 26/00

US Classification:

180326000

Abstract:

A materials handling vehicle is provided. The vehicle comprises a main body, a seat deck assembly including an operator seat, and structure for movably mounting the seat deck assembly to the main body. The seat deck assembly moves relative to the main body along a varying radius path.