Electronically controlled valve for a materials handling vehicle
First Claim
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1. A materials handling vehicle comprising:
- a base;
a carriage assembly movable relative to said base;
at least one cylinder coupled to said base to effect movement of said carriage assembly relative to said base;
a hydraulic system to supply a pressurized fluid to said cylinder, said hydraulic system including an electronically controlled valve coupled to said cylinder; and
control structure to control the operation of said valve such that said valve is closed in the event of an unintended descent of a carriage assembly in excess of a commanded speed.
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Abstract
A materials handling vehicle is provided comprising: a base; a carriage assembly movable relative to the base; at least one cylinder coupled to the base to effect movement of the carriage assembly relative to the base; and a hydraulic system to supply a pressurized fluid to the cylinder. The hydraulic system includes an electronically controlled valve coupled to the cylinder. The vehicle further comprises control structure to control the operation of the valve such that the valve is closed in the event of an unintended descent of a carriage assembly in excess of a commanded speed.
77 Citations
24 Claims
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1. A materials handling vehicle comprising:
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a base;
a carriage assembly movable relative to said base;
at least one cylinder coupled to said base to effect movement of said carriage assembly relative to said base;
a hydraulic system to supply a pressurized fluid to said cylinder, said hydraulic system including an electronically controlled valve coupled to said cylinder; and
control structure to control the operation of said valve such that said valve is closed in the event of an unintended descent of a carriage assembly in excess of a commanded speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A materials handling vehicle comprising:
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a base;
a carriage assembly movable relative to said base;
at least one cylinder coupled to said base to effect movement of said carriage assembly relative to said base;
a hydraulic system to supply a pressurized fluid to said cylinder, said hydraulic system including an electronically controlled valve coupled to said cylinder; and
control structure to control the operation of said valve such that said valve is closed in the event of a loss of pressure in the fluid being supplied by said hydraulic system to said valve. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A materials handling vehicle comprising:
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a base;
a carriage assembly movable relative to said base;
at least one cylinder coupled to said base to effect movement of said carriage assembly relative to said base;
a hydraulic system to supply a pressurized fluid to said cylinder, said hydraulic system including an electronically controlled valve coupled to said cylinder; and
control structure to control the operation of said valve such that said valve is closed in the event of an unintended descent of a carriage assembly in excess of a fixed threshold speed.
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Specification