Abstract: A grounds maintenance vehicle having a vehicle frame is disclosed. An implement is coupled to the vehicle frame and has a first implement end and a second implement end. A height selection tool is configured to select one vertical position of a plurality of selectable vertical positions, where each vertical position limits a distance between the implement and the vehicle frame. An implement angle selection tool is configured to change the elevation of the first implement end relative to the second implement end and fix the elevation of the first implement end relative the second implement end. The implement angle selection tool has a manually engageable mechanism configured to change the elevation of the first implement end relative to the second implement end when the implement angle selection tool is disengaged.

Abstract: A grounds maintenance vehicle having a vehicle frame is disclosed. An implement is coupled to the vehicle frame and has a first implement end and a second implement end. A height selection tool is configured to select one vertical position of a plurality of selectable vertical positions, where each vertical position limits a distance between the implement and the vehicle frame. An implement angle selection tool has a manually engageable mechanism configured to change the elevation of one of the first implement end or the second implement end relative to the other of the first implement end or the second implement end. The implement angle selection tool is configured to fix the elevation of the first implement end relative the second implement end.

Abstract: A grounds maintenance vehicle having a vehicle frame is disclosed. An implement is coupled to the vehicle frame and has a first implement end and a second implement end. A height selection tool is configured to select one vertical position of a plurality of selectable vertical positions, where each vertical position limits a distance between the implement and the vehicle frame. An implement angle selection tool is configured to change the elevation of the first implement end relative to the second implement end and fix the elevation of the first implement end relative the second implement end. The implement angle selection tool has a manually engageable mechanism configured to change the elevation of the first implement end relative to the second implement end when the implement angle selection tool is disengaged.

Abstract: A detention cell locking system affording improved securement and reliability in the locking network of multiple detention cell doors. Mechanical actuation linkages are interconnected for motion responsive to either select manual, mechanical, or electrical signals actuating a DC motor drive. The locking mechanism incorporates an elongate toggle plate mounted to a carriage plate and a pair of cell door support rollers forming part of a mechanical locking system. The toggle plate assembly on the carriage plate permits a turning moment to be generated for lost motion actuation which effects locking and unlocking of the detention cell doors. A control network determines the length of time that the DC motor is electrically actuated and disengages the power to the motor during manual mechanical actuation.

Abstract: An angularity sensor is disclosed for incorporation within center pivot irrigation systems for providing a signal to respective controllers controlling the rotational driving force of respective span units in response to angular deviation between adjacent span units. The angularity sensor disclosed resists erroneous signals from roll, pitch, longitudinal extensions and contractions, and traverse dislocations between adjacent span units. It responds only to angular deviations between adjacent span units regardless of the other movements caused by the terrain being traversed. Parallel extensible members under tension are attached to opposite sides of one span unit and connected on the opposite end to a horizontal member rotatably mounted for rotation in a horizontal plane on the opposite span member. The rotatable member is connected to the input of the controller whereby only rotational forces of the rotating member are transmitted to the controller as angularity deviation signals.