Arrangement in connection with an oscillator cylinder
An arrangement in combination with an oscillating cylinder ( 1 ), whereby the arrangement includes a working valve ( 10 ) of cylinder ( 1 ) to transmit pressure medium into cylinder ( 1 ), impulse valves ( 5 ) by means of which, by working valve is controlled, control means ( 4 ), as discs, from movable piston rod ( 18 ) to cylinder ( 1 ) outside, which can be arranged to get in several different linear positions in contact with the control means impulse valves ( 5 ) in order to produce a stroke length set for the piston rod of the oscillation cylinder. In the arrangement the impulse valves are placed sideways outside control means ( 4 ) and the required impact to be achieved from the control means (to the impulse valves ( 5 ) is moved by means of special arms ( 13 ) moved from control means ( 4 ) as an opening/closing motion of the shut-off part of the impulse valves whereby the structural length of the oscillating cylinder can be achieved essentially shorter in the cylinder back end of control means ( 4 ), ( 5 ).
1. A control arrangement for an oscillating cylinder device having a cylinder, a movable piston in the cylinder, and a movable piston rod connected to the piston and having a rod portion always extending outside of the cylinder, said control arrangement comprising:
a working valve of the cylinder device which transmits a pressure medium into different sides of the cylinder to oscillate the piston in the cylinder,
respective impulse valves connected to the working valve, each impulse valve having a contact member controlling a shut-off part thereof, each shut-off part effecting a respective change of oscillation direction of the piston by controlling the transmission of the pressure medium from the working valve to the different sides of the cylinder,
control elements which extend radially from the rod portion of the movable piston rod outside of the cylinder, the control elements being individually locatable to different linear positions along the rod portion in order to produce a desired stroke length for the piston rod of the oscillation cylinder device,
wherein the impulse valves are located radially beyond the control elements extending from the rod portion, and
respective arms having one or more folds, the respective arms being adapted to provide a required impact to a respective contact member on the respective impulse valves upon engagement with an associated control element to control an opening/closing of the shut-off part of the respective impulse valves, and
whereby the use of the arms to control the impulse valves allows the impulse valves to be placed radially beyond the control elements and in positions where the impulse valves do not increase the structural length of the rod portion always extending from the cylinder, and hence whereby a structural length of the oscillation device is minimized.
2. An arrangement according to claim 1 , wherein the arms each have one end fixed by a turning joint to a suitable body portion of the cylinder device and thus the arms act as turning levers.
3. An arrangement according to claim 1 , wherein the arms each have one end fixed by a stiff joint to a suitable body portion of the cylinder device and each arm is flexible so as to move by bending when engaged by an associated one of the control elements.
4. An arrangement according to claim 1 , wherein the control elements are discs adapted to be placed closer to each other than the desired stroke length of the cylinder.
5. An arrangement according to claim 1 , wherein the shut-off part of each impulse valve is a ball that lets a pressure medium out of the respective impulse valve.