US 11,926,512 B2
Work machine
Manato Shirai, Kagawa (JP); Kazu Nagahama, Kagawa (JP); and Masahide Zushi, Kagawa (JP)
Assigned to TADANO LTD., Kagawa (JP)
Appl. No. 17/613,299
Filed by TADANO LTD., Kagawa (JP)
PCT Filed Aug. 21, 2020, PCT No. PCT/JP2020/031660
§ 371(c)(1), (2) Date Nov. 22, 2021,
PCT Pub. No. WO2021/033771, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 2019-151521 (JP), filed on Aug. 21, 2019.
Prior Publication US 2022/0212904 A1, Jul. 7, 2022
Int. Cl. B66C 23/70 (2006.01)
CPC B66C 23/708 (2013.01) [B66C 23/705 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A work machine comprising:
a telescopic boom having a first boom and a second boom that are telescopically overlapped;
a telescoping actuator that moves the first boom in a telescoping direction with respect to the second boom;
an electrical drive source provided in a movable portion of the telescoping actuator;
a first fixing pin that connects the telescoping actuator and the first boom;
a first biasing mechanism that biases the first fixing pin to maintain a connection state between the telescoping actuator and the first boom;
a first connection mechanism that operates on the basis of the power of the electrical drive source, the first connection mechanism switching between the connection state and a disconnection state between the telescoping actuator and the first boom by inserting and removing the first fixing pin;
a second fixing pin that connects the first boom and the second boom;
a second biasing mechanism that biases the second fixing pin to maintain a connection state between the first boom and the second boom;
a second connection mechanism that operates on the basis of the power of the electrical drive source, the second connection mechanism switching between the connection state and a disconnection state between the first boom and the second boom by inserting and removing the second fixing pin; and
a clutch that is disposed in a power transmission path from the electrical drive source to the first connection mechanism and the second connection mechanism, the clutch discretionally intermittently transmitting the power of the electrical drive source to the first connection mechanism and the second connection mechanism.