초록 ▼

A hydraulic-pneumatic cylinder device of the invention comprises a tubular housing closed at both ends, and an actuating piston slidably guided in the housing and connected to a piston rod. A pair of hydraulic units, each of which comprises a pair of volume-variable liquid chambers in communication

A hydraulic-pneumatic cylinder device of the invention comprises a tubular housing closed at both ends, and an actuating piston slidably guided in the housing and connected to a piston rod. A pair of hydraulic units, each of which comprises a pair of volume-variable liquid chambers in communication with each other through a flow control passage, are arranged within the housing on both sides of the piston to act thereon in opposite axial directions. A pair of air chambers, which are selectively connectable to an air supply source, are also provided within the housing to act on the respective hydraulic units. Operation of the cylinder device can be reliably adjusted by a flow regulating valve provided at each flow control passage.

대표청구항 ▼

A hydraulic-pneumatic cylinder device comprising: tubular housing means hermetically closed at both ends; an actuating piston axially slidably guided within said tubular housing means; a piston rod connected to said piston and axially extending in said housing means to project out through one end th

A hydraulic-pneumatic cylinder device comprising: tubular housing means hermetically closed at both ends; an actuating piston axially slidably guided within said tubular housing means; a piston rod connected to said piston and axially extending in said housing means to project out through one end thereof; an air chamber disposed within said housing means, said air chamber being pressurizable to cause movement of said piston in one axial direction; a hydraulic unit associated with said air chamber and arranged within said housing means to act on one side of said piston, said hydraulic unit including an input liquid chamber adjoining said air chamber via interface means, an output liquid chamber adjoining said one side of said actuating piston, and at least one flow control passage provided with adjustable flow control means and communicating with said input and output liquid chambers, said interface means being capable of allowing volumetric variation of said input liquid chamber, said output liquid chamber being variable in volume in complementary relation to the volumetric variation of said input liquid chamber to cause axial movement of said actuating piston; and complementing means arranged within said housing means to act on the other side of said piston for causing movement thereof in the opposite axial direction; wherein said interface means comprises an annular flexible bag defining therein said input liquid chamber, said bag including an annular radially inner portion, an annular radially outer portion, an annular closure end, and an annular open end, said closure end of said bag being non-fixed, said open end of said bag being fixed and held in communication with said output liquid chamber, wherein said annular radially inner portion and said annular radially outer portions both have a surface, and wherein the surface of aid annular radially inner portion and the surface of said annular radially outer portion merge smoothly with each other at said annular closure end.