Expandable spreader control circuit
First Claim
1. In an extensible spreader having a base section and an extensible section telescoped on said base section with hydraulic ram means for extending and retracting said extensible section;
- a hydraulic circuit including a reservoir, a pressurized hydraulic source, conduit means connecting said reservoir and source to said ram means and solenoid operated valve means in said conduit means; and
an electric control circuit for controlling said valve means, said control circuit including a power source, extend and retract solenoids for said valve means, manually operated selector means for selectively energizing one of said solenoids, holding means for maintaining said one of said solenoids energized when said manually operated selector means is returned to a neutral position and for precluding simultaneous energization of both solenoids, and position control means for deenergizing said one of said solenoids when said extensible section reaches a predetermined position with respect to said base section.
3 Assignments
0 Petitions
Accused Products
Abstract
A control system for extending and retracting a spreader having a base section and a pair of extensible sections includes a hydraulic circuit for supplying pressurized fluid to fluid rams to extend and retract the sections with an electric control circuit for actuating a control valve. The electric control circuit includes a manual switch having extend and retract positions energizing extend and retract solenoids on the valve. The electric circuit also includes holding means for maintaining either solenoid energized and position control means for automatically deenergizing either solenoid when the sections reach a predetermined position with respect to each other. A single two-position switch is utilized as the position control means cooperates with the hydraulic circuit which locks the spreader sections in predetermined position with respect to each other. These predetermined positions are defined by an elongated rod having detents spaced thereon and secured to one extensible section with an electrical cable surrounding the rod and extending to the outer end of the extensible section to define the electrical connections between the switches on the extensible sections and the remainder of the electrical circuit and the hydraulic circuit on the base section.
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Citations
19 Claims
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1. In an extensible spreader having a base section and an extensible section telescoped on said base section with hydraulic ram means for extending and retracting said extensible section;
- a hydraulic circuit including a reservoir, a pressurized hydraulic source, conduit means connecting said reservoir and source to said ram means and solenoid operated valve means in said conduit means; and
an electric control circuit for controlling said valve means, said control circuit including a power source, extend and retract solenoids for said valve means, manually operated selector means for selectively energizing one of said solenoids, holding means for maintaining said one of said solenoids energized when said manually operated selector means is returned to a neutral position and for precluding simultaneous energization of both solenoids, and position control means for deenergizing said one of said solenoids when said extensible section reaches a predetermined position with respect to said base section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a hydraulic circuit including a reservoir, a pressurized hydraulic source, conduit means connecting said reservoir and source to said ram means and solenoid operated valve means in said conduit means; and
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11. A control circuit for expanding and contracting at least two spreader sections relative to each other by a fluid ram interposed between said sections consisting of a hydraulic circuit including a reservoir, a pressurized fluid source with conduit means between said reservoir, fluid source and fluid ram, and solenoid operated valve means having extend and retract solenoids;
- and an electric control circuit including a power source, manually operated selector means connected to said power source and said solenoids for selectively energizing said solenoids, and position control means for deenergizing an energized solenoid, said position control means including a single switch means supported on one of said sections and having an actuator movable between operative and inoperative positions, and elongated actuating member supported on the other of said sections and cooperating with said switch means to allow said switch means to be moved from said operative position to said inoperative position when said sections are in a predetermined position with respect to each other.
- View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
Specification