1. An elevator apparatus comprising:
a car;
suspension means for suspending the car;
a hoisting machine including
a drive sheave around which the suspension means is looped,
a hoisting machine motor for rotating the drive sheave, and
a first brake device and a second brake device for braking rotation of the drive sheave;
an operation control section for controlling raising and lowering of the car by controlling the hoisting machine motor; and
a brake control section for controlling operations of the first brake device and the second brake device, wherein:
the first brake device includes a first electromagnetic coil for releasing the braking force;
the second brake device includes a second electromagnetic coil for releasing the braking force;
a first electromagnetic switch and a second electromagnetic switch are provided between the first and second electromagnetic coils and a power source; and
the brake control section includes:
a first electromagnetic coil control switch provided between the first electromagnetic coil and a ground section;
a second electromagnetic coil control switch provided between the second electromagnetic coil and the ground section;
a first processing section for opening and closing the first electromagnetic switch and the first electromagnetic coil control switch in response to a braking operation command issued from the operation control section; and
a second processing section for opening and closing the second electromagnetic switch and the second electromagnetic coil control switch in response to the braking operation command.
2. The elevator apparatus according to claim 1, further comprising:
an electromagnetic contactor provided between the hoisting machine motor and the power source;
an electromagnetic contactor driving coil for driving the electromagnetic contactor;
an overspeed detecting switch for detecting an overspeed of the car;
hoistway switches for detecting overrun of the car beyond a range in which the car is raised and lowered; and
a motor power cut-off detecting section for detecting cut-off of power supply to the hoisting machine motor by the electromagnetic contactor, wherein:
the electromagnetic contactor driving coil, the overspeed detecting switch and the hoistway switches are connected in series between the power source and the ground section; and
the first processing section and the second processing section control opening and closing of the first electromagnetic coil switch and the second electromagnetic coil switch so as to allow the speed of the car to follow a target speed reduction pattern when the cut-off of the power supply to the hoisting machine motor is detected.
3. The elevator apparatus according to claim 2, further comprising a speed detecting section for detecting a speed of the car,
wherein the first processing section and the second processing section open the first electromagnetic switch and the second electromagnetic switch in a case where the speed of the car is equal to or higher than a preset speed when the cut-off of the power supply to the hoisting machine motor is detected.
4. The elevator apparatus according to claim 1, further comprising:
an electromagnetic contactor provided between the hoisting machine motor and the power source;
an electromagnetic contactor driving coil for driving the electromagnetic contactor;
a door-open detecting section for detecting opening of an elevator door; and
a door-zone detecting section for detecting that the car is located within a door zone, wherein:
the brake control section further comprises:
a first contactor control switch to be opened and closed by the first processing section; and
a second contactor control switch to be opened and closed by the second processing section;
the first contactor control switch and the second contactor control switch are connected in series to the electromagnetic contactor driving coil between the power source and the ground section; and
the first processing section and the second processing section open the first contactor control switch and the second contactor control switch in a case where the opening of the elevator door is detected when the car is located out of the door zone.
5. The elevator apparatus according to claim 4, further comprising a speed detector for detecting a speed of the car,
wherein the first processing section and the second processing section control opening and closing of the first electromagnetic coil control switch and the second electromagnetic coil control switch so as to allow the speed of the car to follow a target speed reduction pattern in a case where the opening of the elevator door is detected when the car is located out of the door zone and the speed of the car is equal to or higher than a preset speed.
6. The elevator apparatus according to claim 4, wherein the first processing section and the second processing section open the first electromagnetic switch and the second electromagnetic switch in a case where the opening of the elevator door is detected when the car is located out of the door zone and the speed of the car is less than a preset speed.
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 marine knuckle boom crane comprising:
a stationary pedestal to be mounted to or formed integral with a vessel;
a crane housing having an upper portion, a central portion and a lower portion, the crane housing being rotational relative to the pedestal about a vertical rotation axis; and
a knuckle boom assembly attached to the crane housing, the knuckle boom assembly comprising:
a main boom comprising an inner end, a central area and an outer end, the inner end of the main boom being connected pivotably about a first horizontal pivot axis to a lower portion of the crane housing; and
a jib comprising an inner end, a central area and a tip opposite the inner end of the jib, the inner end of the jib being connected pivotably about a second horizontal pivot axis to the outer end of the main boom, wherein the jib is pivotable at least between an extended position in which the tip extends mainly forward from the main boom, and a folded position in which the jib is folded back, essentially parallel along the main boom,
wherein in order to position the jib with respect to the main boom, a tensioning member and a curved extension guide are provided, the tensioning member extending between the crane housing and the curved extension guide, and the curved extension guide being connected to the jib and being pivotable together with the jib about the second pivot axis, and guiding a portion of the tensioning member, wherein a second winch allows to vary the length of the tensioning member and thus to position the jib; and
wherein in order to position the main boom, a luffing cable is provided, extending between the outer end of the main boom and the upper portion of the crane housing, and wherein a third winch allows to vary the length of the luffing cable and thus to position the main boom.
2. The marine knuckle boom crane according to claim 1, wherein a vang is provided between the main boom and the jib to position andor fixate the position of the jib with respect to the main boom.
3. The marine knuckle boom crane according to claim 1, wherein the tensioning member extends between the lower portion of the crane housing and the curved extension guide.
4. The marine knuckle boom crane according to claim 1, wherein the tensioning member extends between the central portion of the crane housing and the curved extension guide.
5. The marine knuckle boom crane according to claim 1, wherein the tensioning member extends between the upper portion of the crane housing and the curved extension guide.
6. The marine knuckle boom crane according to claim 1, wherein the tensioning member comprises a first portion being guided by the curved extension guide and a second portion of which the length may be varied by the second winch.
7. The marine knuckle boom crane according to claim 1, further comprising a hoist assembly, comprising a first winch and a hoisting cable, extending from the winch via sheaves over the tip of the jib to a load suspension device.
8. The marine knuckle boom crane according to claim 2, wherein the tensioning member extends between the lower portion of the crane housing and the curved extension guide.
9. The marine knuckle boom crane according to claim 2, wherein the tensioning member extends between the central portion of the crane housing and the curved extension guide.
10. The marine knuckle boom crane according to claim 2, wherein the tensioning member extends between the upper portion of the crane housing and the curved extension guide.
11. The marine knuckle boom crane according to claim 2, wherein the tensioning member comprises a first portion being guided by the curved extension guide and a second portion of the which the length may be varied by the second winch.
12. The marine knuckle boom crane according to claim 3, wherein the tensioning member comprises a first portion being guided by the curved extension guide and a second portion of the which the length may be varied by the second winch.
13. The marine knuckle boom crane according to claim 4, wherein the tensioning member comprises a first portion being guided by the curved extension guide and a second portion of the which the length may be varied by the second winch.
14. The marine knuckle boom crane according to claim 5, wherein the tensioning member comprises a first portion being guided by the curved extension guide and a second portion of the which the length may be varied by the second winch.
15. The marine knuckle boom crane according to claim 2, further comprising a hoist assembly, comprising a first winch and a hoisting cable, extending from the winch via sheaves over the tip of the jib to a load suspension device.
16. The marine knuckle boom crane according to claim 3, further comprising a hoist assembly, comprising a first winch and a hoisting cable, extending from the winch via sheaves over the tip of the jib to a load suspension device.
17. The marine knuckle boom crane according to claim 4, further comprising a hoist assembly, comprising a first winch and a hoisting cable, extending from the winch via sheaves over the tip of the jib to a load suspension device.
18. The marine knuckle boom crane according to claim 5, further comprising a hoist assembly, comprising a first winch and a hoisting cable, extending from the winch via sheaves over the tip of the jib to a load suspension device.
19. The marine knuckle boom crane according to claim 6, further comprising a hoist assembly, comprising a first winch and a hoisting cable, extending from the winch via sheaves over the tip of the jib to a load suspension device.