Hydraulic apparatus, handle, and method of providing an extendable handle

摘要: Handles, extendable handles, and linkage mechanisms are examples of apparatuses that include a body; pivotably attached head; cylinder, actuator, or hydraulic actuator; fluid passage hose; valve, blocking means, control device. The device may be normally open close only when held closed, connected on one side to the hose another atmosphere. An operator use tool, such as drywall flat box head, by holding handle controlling pivoting head operating valve. Methods providing for an tool handle, instructing actuate means hold in constant orientation relative handle.