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Clamp having a load-clamping hydraulic cylinder with multiple telescopically extensible stages adapted to apply load clamping force alternatively responsive to load-lifting force or load size

A hydraulic cylinder and clamping force technology, applied in the direction of lifting devices, chucks, manufacturing tools, etc., can solve the problems of reducing the clamping force, falling of the clamped objects, etc., and achieve the effect of a large load size range

Active Publication Date: 2018-05-11
CASCADE CORP
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Problems solved by technology

However, the latter type of load-weight dependent clamping system has not previously been considered for use with hydraulic clamping cylinders having more than a single extendable stage, because each of the cylinders during cylinder extension Additional successive stages have progressively decreasing pressure areas, resulting in progressively decreasing clamping forces, which may cause the clamp to drop the clamped object

Method used

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  • Clamp having a load-clamping hydraulic cylinder with multiple telescopically extensible stages adapted to apply load clamping force alternatively responsive to load-lifting force or load size
  • Clamp having a load-clamping hydraulic cylinder with multiple telescopically extensible stages adapted to apply load clamping force alternatively responsive to load-lifting force or load size

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[0013] In the following detailed description, certain specific preferred features are described to facilitate the understanding of the present invention. However, the present invention can be carried out in various ways without using these specific features.

[0014] figure 1 A preferred embodiment of a hydraulic system that can be used in the present invention to advantageously control a load handling fixture of the type normally carried by a forklift used to handle rolls of paper or other heavy loads is shown. The hydraulic system is adapted for automatic variable load weight responsive control of load clamping force on a load where minimization of the retracted hydraulic clamp actuator telescoping length versus the extended hydraulic clamp actuator telescopic length is desired. The maximization of telescoping length combines to increase the range of sizes of clamped loads that can be handled by a forklift. The system preferably includes one or more hydrodynamic load clamp...

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Abstract

A load-handling clamp mountable on a lift truck has one or more hydraulic clamping cylinders of the type having two or more sequentially extensible stages capable of applying either load-weight-responsive variable hydraulic load-clamping force or, alternatively, load-size-responsive variable hydraulic load-clamping force, without risking the clamp's dropping of a clamped load. The length of the hydraulic clamping cylinder(s) may in some applications extend generally forwardly from a supporting lift truck, and in other applications extend generally laterally from a supporting lift truck.

Description

[0001] Cross References to Related Applications [0002] none technical field [0003] The present disclosure generally relates to a hydraulic circuit optimized for the handling of paper rolls or other objects by a forklift mounted load clamp capable of automatically applying a load weight responsive variable hydraulic load clamping force. Background technique [0004] US Patent No. 6,454,511 discloses an existing electrical system for load weight responsive hydraulic control of the load clamping force by electrically sensing the load weight, and by responding to the sensed load by the electrical controller A weight and variably controlled pressure relief valve automatically limits the maximum hydraulic load holding force. [0005] US Patent Application Publication No. 2010 / 0089704 discloses a simpler mechanical type system that does not require an electrical controller, but is capable of automatically applying load weight in response to a variable hydraulic load clamping f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25J13/08B25J15/04B66F9/22
CPCB66F9/22B66F9/184B66F9/183
Inventor B·G·朗宁
Owner CASCADE CORP
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