Blockable device for the stepless adjustment of flaps

Claim 2

A piston-cylinder device for the stepless adjustment of relatively movable parts and for blocking same in any desired position, comprising a cylinder containing pressurized fluid; a piston rod, mounted axially displaceably within said cylinder, projecting at one end in a sealed manner from said cylinder and connected at its other end with a piston sealed by an annular seal against the inner bore of said cylinder, wherein said piston comprises at least one continuous connecting conduit bridging said annular seal; and having a plurality of outlet orifices obturating means comprising a plurality of valve means each associated with elastic spring elements which press each associated valve means from the outside against a seat on an associated outlet orifice, wherein said elastic spring elements are each formed by an annular spring mounted on the outer periphery of said piston; whereby said outlet orifices of said connecting conduit are completely closed on both sides of said annular seal; and means concurrently opening said obturating means and the flow cross section of said outlet orifices.

Claim 3

A piston-cylinder device as set forth in claim 1, wherein said means for opening comprises an adjusting body with two beads mounted axially displaceably within the connecting conduit in the piston, whereby, when the adjusting body is moved, the valve means are pushed outwardly against the force of their associaTed springs from the closed position into the open position.

Claim 4

A piston-cylinder device as set forth in claim 2, wherein the piston rod has a central, axial, bore, in which a control rod is axially displaceably mounted, wherein this control rod is connected with the said adjusting body and is adapted to be actuated from the outside.

Claim 5

A piston-cylinder device as set forth in claim 1, wherein said means for opening comprises an adjusting body, mounted rotatably in the said connecting conduit, and equipped with two cams which lift, during the rotation of the adjusting body, the valve means off their respective seats and open the flow cross section of both outlet orifices of the said connecting conduit.

Claim 6

A piston-cylinder device as set forth in claim 4, wherein the piston rod is connected with the piston in an axially undisplaceable, but rotatable manner and with the adjusting body in a nonrotatable manner.

Claim 7

A piston-cylinder device as set forth in claim 4, wherein the piston rod has a central, axial bore, in which a control rod is mounted axially nondisplaceably, but externally rotatably, and wherein this control rod is connected in a nonrotatable manner with the adjusting body.

Claim 8

A piston-cylinder device as set forth in claim 3, including two semicylindrical rings, each provided with an annular recess which cooperates with an annular projection of the piston, and comprising further an outer ring member by means of which the two inner semicylindrical rings are held together.

Claim 9

A piston-cylinder device according to claim 8, in which said shutoff members each comprises a valve ball.

Claim 10

A piston-cylinder device comprising: a cylinder containing fluid under pressure; a piston rod arranged in axially displaceable manner in said cylinder, one end of said piston rod extending outwardly in sealed fashion from said cylinder, the other end of said piston rod being connected with a piston which is sealed with respect to the inner wall of said cylinder by an annular packing, said piston comprising at least one continuous connecting channel which bridges said annular packing and has a plurality of outlet openings provided with a sealing surface, said openings lying on both sides of said annular packing, a plurality of shutoff members, each of which is associated with one of said plurality of sealing surfaces of said outlet openings, a plurality of annular springs respectively associated with said shutoff members by which said shutoff members are pressed from the outside against the associated sealing surfaces of said outlet openings into a closed position in which the passage cross sections of said plurality of outlet openings are completely closed, and means for concurrently lifting said shutoff members from their sealing surfaces and for opening said passage cross sections of said outlet openings.

Claim 11

A piston-cylinder device comprising: a cylinder containing fluid under pressure; a piston rod arranged in axially displaceable manner in said cylinder, one end of said piston rod extending outwardly in sealed fashion from said cylinder, the other end of said piston rod being connected with a piston which is sealed with respect to the inner wall of said cylinder by an annular packing, said piston comprising at least one continuous connecting channel which bridges said annular packing and has a plurality of outlet openings provided with a sealing surface, said openings lying on both sides of said annular packing, a plurality of shutoff members, each of which is associated with one of said plurality of sealing surfaces of said outlet openings, a plurality of annular springs respectively associated with said shutoff members by which said shutoff members are pressed from the outside against the associated sealing surfaces of said outlet openings into a closed position in which the passage cross sections of said plurality of outlet openings are completely closed, and means for concurrently lifting said shutoff members from their sealing surfaces and for opening said passage cross sections of said outlet openings.