1. A telescopic boom comprising:
a boom body provided in a working vehicle and in which a plurality of boom members including a top boom member are telescopically inserted and are formed to be moved telescopically in a longitudinal direction;
a telescopic cylinder that is positioned in the top boom member at a completely contracted time of the boom body and extendscontracts the boom body; and
at least a roller that is provided at a tip end portion of the telescopic cylinder and disposed to roll in the longitudinal direction, wherein
the roller has an outer peripheral surface that is formed to be curved in a convex shape outside as viewed in the longitudinal direction such that the roller makes contact with a lower plate of the boom body in a state where both end portions of the roller are away from the lower plate.
2. A telescopic boom according to claim 1, wherein a plurality of the rollers are provided at the tip end portion of the telescopic cylinder.
3. A telescopic boom according to claim 2, further comprising a bracket that is mounted at the tip end portion of the telescopic cylinder and is swingably provided in a longitudinal direction of the boom body,
wherein the plurality of the rollers are provided on the bracket and are arranged in the longitudinal direction of the boom body.
4. A telescopic boom according to claim 1, further comprising a reinforcement plate provided to reinforce a portion of the lower plate where the roller is in contact with the lower plate of the top boom member in a state where the boom body is completely contracted and horizontal.
5. A telescopic boom according to claim 2, further comprising a reinforcement plate provided to reinforce a portion of the lower plate where the rollers are in contact with the lower plate of the top boom member in a state where the boom body is completely contracted and horizontal.
6. A telescopic boom according to claim 3, further comprising a reinforcement plate provided to reinforce a portion of the lower plate where the rollers are in contact with the lower plate of the top boom member in a state where the boom body is completely contracted and horizontal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A valve device for frost-proof exterior use, comprising:
an inflow opening,
a discharge opening,
a connecting channel, which connects the inflow opening to the discharge opening,
a main valve, which is embodied to open the fluid connection through the connecting channel in an open operating position and to block it in a closed operating position,
an actuating mechanism for actuating the main valve, and
draining means for draining the valve device in the closed operating position,
wherein the draining means comprise a bypass line, which connects a first connecting channel section to a second connecting channel section.
2. The valve device of claim 1,
wherein in the installed position of the valve device, the second connecting channel section is situated above, with respect to the direction of gravity, the first connecting channel section.
3. The valve device of claim 1,
wherein in the installed position of the valve device, the distance of the first connecting channel section from the discharge opening is smaller than that of the second connecting channel section.
4. The valve device of claim 1,
wherein the bypass line connects the first connecting channel section to a ventilation space, which is connected to the second connecting channel section.
5. The valve device of claim 1,
wherein the bypass line is formed in a section of the housing wall of the valve device and that in the installed position of the valve device the bypass line extends from the ventilation space in at least one section downward in the direction of gravity toward the discharge opening.
6. The valve device of claim 1,
wherein the bypass line connects the first and the second connecting channel sections for all positions of the actuating mechanism.
7. The valve device of claim 1,
wherein the draining means possess a ventilation valve, which is arranged in the bypass line and in an open position allows access of ambient air into the connecting channel via the bypass line for the purpose of draining the liquid from the connecting channel, and prevents access in a closed position.
8. The valve device of claim 7,
wherein the ventilation valve comprises one valve seat and one valve body, which in a first position of the actuating mechanism on a first travel track is pressed onto the valve seat and in a second position of the actuating mechanism on the first travel track is lifted off the valve seat.
9. The valve device of claim 1,
wherein the actuating mechanism is embodied so that it opens and closes the draining means in response to moving the actuating mechanism along a first travel track and opens and closes the main valve in response to moving the actuating mechanism along a second travel track.
10. The valve device of claim 7,
wherein the actuating mechanism is embodied so that it opens and closes the draining means in response to moving the actuating mechanism along a first travel track and opens and closes the main valve in response to moving the actuating mechanism along a second travel track, and
wherein the first travel track serves in actuating the ventilation valve and the second travel track serves in actuating the main valve.
11. The valve device of claim 9,
wherein the second travel track is a rotary travel track and the first travel track is a translatory travel track oriented axially relative to this rotary travel track.
12. The valve device of claim 9,
wherein the actuating mechanism comprises an actuating element that is moveable along the two travel tracks.
13. The valve device of claim 9,
wherein the draining means comprise a ventilation opening, which allows access of ambient air into the connecting channel for the purpose of draining the liquid from the connecting channel via the discharge opening.
14. The valve device of claim 9,
wherein a guiding mechanism for guiding the actuating mechanism along the first and the second travel track.
15. The valve device of claim 14,
wherein the guiding device guides the actuating mechanism from a first, closed position, in which the main valve is closed and the draining means are in a draining position,
in a first actuating phase along a first direction on the first travel track into a second position, in which the main valve is closed and the draining means are in a non-drain position, and
in a second actuating phase along a first direction on the second travel track to a third, open position, in which the main valve is open and the draining means are in a non-drain position.
16. The valve device of claim 15,
wherein the guiding device guides the actuating mechanism from the third, open position
in a third actuating phase along a second direction on the second travel track\u2014opposite to the motion of the second actuating phase\u2014back to the second position, and
in a fourth actuating phase along a second direction on the first travel track\u2014opposite to the movement of the first actuating phase\u2014back to the first position.
17. The valve device of claim 1,
wherein the actuating mechanism comprises a connecting-link guide.
18. The valve device of claim 17,
wherein the connecting-link guide comprises at least one pin, which is connected to a housing section of the valve device or to an element of the actuating means, and one guide-pin track, which guides the pin and is correspondingly formed at an element of the actuating means or at the housing of the valve device.
19. The valve device of claim 1,
wherein the main valve is embodied as a sliding valve, in particular as a rotary slide valve.
20. The valve device of claim 19,
wherein the main valve comprises a first valve element with at least one flow opening and a second valve element, which is rotatable about an axis and comprises at least one eccentric sealing face, which blocks the at least one flow opening of the first valve element in the closed operating position.
21. The valve device of claim 20,
wherein the axial distance between the first valve element and the second valve element is the same in the open and the closed operating position.
22. The valve device of claim 20,
wherein the first valve element is embodied as disk with two eccentric openings.
23. The valve device of claim 1,
wherein the main valve comprises at least one valve element of a ceramic material.
24. The valve device of claim 23,
wherein the main valve comprises two valve elements of a ceramic material.
25. The valve device of claim 1,
wherein the actuating mechanism must be turned by approximately 90\xb0 to reach the closed operating position from the open operating position.
26. The valve device of,
wherein the valve device is configured for horizontal installation in an exterior wall.
27. The valve device of claim 1,
wherein the actuating mechanism comprises a manually actuatable handle element that works together with a connecting rod, which extends through part of the connecting channel, to transfer the movement along the first travel track to the main valve.
28. The valve device of claim 1,
wherein a first backflow prevention device is positioned between the inflow opening and the main valve, to prevent access of polluted water from the valve device through the inflow opening.
29. A valve device for frost-proof exterior use, comprising:
an inflow opening,
a discharge opening,
a connecting channel, which connects the inflow opening to the discharge opening,
a main valve, which is embodied to open the fluid connection through the connecting channel in an open operating position and to block it in a closed operating position,
an actuating mechanism for actuating the main valve, and
draining means for draining the valve device in the closed operating position,
wherein the actuating mechanism is configured so that it opens and closes the draining means in response to moving the actuating mechanism along a first travel track and opens and closes the main valve in response to moving the actuating mechanism along a second travel track.