US 12,540,062 B2Granted

Load-handling vehicle

AssigneeManitou Bf

InventorFrançois Bouyssoux

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Abstract

A load-handling vehicle comprising a load-handling member, a jack for lifting the load-handling member, and a fluid source is provided. The jack may include a lifting chamber and a lowering chamber. The fluid source may be coupled to the lifting chamber and the lowering chamber at a first fluid connection and a second fluid connection, respectively. The first fluid connection may comprise a safety valve normally open in a direction of the flow from the fluid source toward the lifting chamber and normally closed in a direction of flow from the lifting chamber toward the fluid source. A pressure-sensitive valve arranged on the second fluid connection may be controlled in response to the pressure between the safety valve and the fluid source. Additionally, a unidirectional fluid circulation line may fluidly couple the first fluid connection and the second fluid connection.

Claims17

Dependent claims

A load-handling vehicle comprising:

a load-handling member;
a hydraulic ram for raising the load-handling member, the hydraulic ram including a lifting chamber and a lowering chamber;
a source of hydraulic fluid;
a first fluid connection connecting the lifting chamber with the source of hydraulic fluid;
a second fluid connection connecting the lowering chamber with the source of hydraulic fluid;
a safety valve included along the first fluid connection, the safety valve being normally open in a direction of fluid circulation from the source of hydraulic fluid to the lifting chamber and normally closed in a direction of fluid circulation from the lifting chamber to the source of hydraulic fluid;
and
a load-handling device comprising:
a pressure-sensitive valve included along the second fluid connection, the pressure-sensitive valve configured to transition from a closed position to an open position as a function of a pressure in a portion of the first fluid connection extending between the safety valve and the source of hydraulic fluid;
a unidirectional fluid circulation line connecting the first and second fluid connections for looped circulation of fluid from the lowering chamber to the lifting chamber;
and
a blocking member for selectively blocking the unidirectional fluid circulation line, wherein the blocking member is configured to move between an open position and a closed position as a function of a pressure in a portion of the second fluid connection between the pressure-sensitive valve and the source of hydraulic fluid, wherein the pressure-sensitive valve is a proportional valve.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/004,268Filed 18 Jun 2021
Priority: FR 20071747 Jul 2020
Published: US 2023/0271817 A131 Aug 2023
Granted: 3 Feb 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B66F 9/065
Movable, with their loads, on wheels or the like, e.g. fork-lift trucks: non-masted
B66F 9/0655
Non-masted: with a telescopic boom
B66F 9/22
Means for actuating or controlling masts, platforms, or forks: hydraulic devices or systems
F15B 11/024
Systems essentially incorporating special features for controlling the speed or the actuating force of an output member: by means of differential…