Crane

Patent metadata

Field	Value
Publication number	US-11267681-B2
Application number	US-201916976275-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	Feb 28, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

This crane is provided with: a operable functional unit; an operation unit for receiving an operation input for operating the operable functional unit; an actuator that drives the operable functional unit; a first generation unit that generates a first control signal for the actuator on the basis of the operation input; a switch unit that can be switched between a first state and a second state; a first filter unit that filters the first control signal to generate a second control signal when the switch unit is in the second state; and a control unit that controls the actuator on the basis of the first control signal when the switch unit is in the first state, and controls the actuator on the basis of the second control signal when the switch unit is in the second state.

First claim

The invention claimed is:

1. A crane, comprising:
a operable functional unit;
an operation unit that receives an operation input for operating the operable functional unit;
an actuator that drives the operable functional unit;
a first generation unit that generates a first control signal for the actuator on the basis of the operation input;
a switch unit that can be switched between a first state and a second state;
a first filter unit that filters the first control signal to generate a second control signal when the switch unit is in the second state; and
a control unit that controls the actuator on the basis of the first control signal when the switch unit is in the first state, and controls the actuator on the basis of the second control signal when the switch unit is in the second state.

2. The crane according to claim 1 ,
wherein the control unit is configured to
stop the actuator on the basis of the first control signal to stop the actuator in the first state of the switch unit, and
stop the actuator on the basis of the second control signal to stop the actuator in the second state of the switch unit.

3. The crane according to claim 1 , further comprising:
a second generation unit that generates a third control signal to stop the actuator in an automatic operation mode; and
a second filter unit that generates a fourth control signal by filtering the third control signal in the automatic operation mode,
wherein the control unit stops the actuator in the automatic operation mode on the basis of the fourth control signal.

4. The crane according to claim 3 ,
wherein the first filter unit and the second filter unit have different filter characteristics.

5. The crane according to claim 3 , further comprising:
a distance setting unit that sets, in the automatic operation mode, a moving distance of the operable functional unit from when the third control signal is input until the stop of the operable functional unit.

6. The crane according to claim 3 , further comprising:
a first filter characteristic setting unit that sets a filter characteristic of the first filter unit; and
a second filter characteristic setting unit that sets a filter characteristic of the second filter unit.

7. The crane according to claim 1 ,
wherein the switch unit is manually switched by an operator.

8. The crane according to claim 1 ,
wherein the switch unit is automatically switched.

9. The crane according to claim 1 ,
wherein the operable functional unit is a boom, and
the actuator is an actuator for performing at least one of a turning operation, a telescopic operation, and a derricking operation of the boom.

10. The crane according to claim 1 ,
wherein the operable functional unit is a winch for raising and lowering a hook suspended by a wire rope at a tip of a boom, and
the actuator is an actuator for driving the winch.

Assignees

• Tadano Ltd

Inventors

• Goto Tomokazu
• Kanda Shinsuke
• Mizuki Kazuma

Classifications

• B66C13/22

  for electric drives (transmitting control pulses B66C13/40; systems or devices of general application H02P) · CPC title

• B66C13/18 Primary

  Control systems or devices (exclusively for rope, cable, or chain winding mechanisms B66D1/40) · CPC title

• B66C13/063 Primary

  electrical · CPC title

• B66C2700/085

  Control actuators · CPC title