Road structure – process – or apparatus – Apparatus – Means to agitate material
Patent
1980-03-03
1982-01-12
Byers, Jr., Nile C.
Road structure, process, or apparatus
Apparatus
Means to agitate material
180 20, E01C 1938
Patent
active
043102611
ABSTRACT:
Speed and direction of movement of a vibratory roller are controlled by a member which is manually shiftable to a neutral position at which the roller is stopped, through a range of forward positions at one side of neutral, and through a range of rearward positions at the opposite side of neutral. The member actuates a cutout switch that is open only when said member is in neutral, a forward switch that is closed only in the range of forward positions, and a reverse switch that is closed only in the rearward range. A vibratory exciter for the roller operates forwardly when a forward solenoid is energized and reversely when a reverse solenoid is energized. Each solenoid is energized through the contacts of an associated relay, which are closed when the coil of the relay is energized through a circuit comprising, in series, a current source, the cutout switch, and the respective forward or reverse switch for the solenoid. The coil and contacts of each relay are in a self-holding circuit through the cutout switch and bypassing the forward and reverse switches; hence, once energized, a relay coil remains energized until the member is shifted to neutral, even through the forward and reverse switches may open at slow roller speeds.
REFERENCES:
patent: 3605583 (1971-09-01), Keppler
patent: 3703836 (1972-11-01), Kiser
patent: 3778177 (1973-12-01), Haker
patent: 3814531 (1974-06-01), Carnahan
patent: 4149253 (1979-04-01), Paar
patent: 4187036 (1980-02-01), Haker
Byers Jr. Nile C.
Nilles James E.
Wacker Corporation
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