Resources Contact Us Home
Dock leveler hydraulic circuit

Image Number 2 for United States Patent #5511267.

A dock leveler having a deck assembly, a first hydraulic cylinder to power said deck assembly to a raised position, lip mounted to said deck assembly, and a second hydraulic cylinder for powering said lip into an extended position. An hydraulic power circuit is coupled to the first and second hydraulic cylinders to control movement of said deck and lip. The hydraulic power circuit includes a pump to deliver fluid under pressure, a first valve operatively coupled to the pump to control fluid flow to the first hydraulic cylinder. A second valve is operatively coupled to the second hydraulic cylinder. An adjustable relief valve is coupled to the second valve to prevent a reduction of fluid pressure to the second hydraulic cylinder after the pump has supplied fluid under pressure through the second valve to extend the lip.

  Recently Added Patents
Multi-carrier operation for wireless systems
Telecommunications system and method
Apparatus, system, and method for non-interruptively updating firmware on a redundant hardware controller
Metal melting apparatus and method for melting metal
Predictive time entry for workforce management systems
  Randomly Featured Patents
Method for inhibiting neoplastic cells and related conditions by exposure thienopyrimidine derivatives
Wall plate having internal nose for electrical cable
Flipper type arrow rest
Insulating venetian blind
Optical receiver and clock generation method
Modified polysilazane and process for preparation thereof
Backing chorus mixing device and karaoke system incorporating said device
Fabric shift sequencing for pattern producing hollow needle tufting apparatus
Process for preparing gaseous hydrogen chloride from dilute aqueous hydrochloric acid
Fly tyer's vise