Work machine

Patent metadata

Field	Value
Publication number	US-2025296817-A1
Application number	US-202318868787-A
Country	US
Kind code	A1
Filing date	Jun 13, 2023
Priority date	Jun 17, 2022
Publication date	Sep 25, 2025
Grant date	—

Abstract

This work machine includes: a plurality of booms that extend and contract by means of power of an actuator; a boom coupling pin which is supported by the booms, moves in the entering direction by means of a spring to turn into an entering state in which adjacent booms are coupled, and moves in the pulling direction by means of power of a motor to turn into a pulling state in which the coupling is released; and a manual operation member inserted into the boom coupling pin and disposed coaxially with the boom coupling pin. As the manual operation member rotates on the basis of the manual operation of an operator, the boom coupling pin moves in the pulling direction together with the manual operation member, and the coupling between adjacent booms is released.

First claim

1 . A work machine comprising:
a plurality of booms that extend and shorten by power of an actuator; a boom coupling pin that is moved in an insertion direction by a spring to turn into an insertion state where adjacent ones of the booms make a coupling with each other and that is moved in a removal direction by power of a motor to turn into a removal state where the coupling is released, the boom coupling pin being supported by the booms; and a manual operation member that is inserted into and passes through the boom coupling pin, the manual operation member being disposed coaxially with the boom coupling pin, wherein when the manual operation member is rotated based on an operator's manual operation, the boom coupling pin moves in the removal direction together with the manual operation member to release the coupling between the adjacent booms.

2 . The work machine according to claim 1 , further comprising a support member having a support-side screw hole, the support member supporting the boom coupling pin on the booms, wherein
the manual operation member makes a screw coupling with the support-side screw hole and is configured to be able to convert, based on the screw coupling, rotation of the manual operation member into movement thereof in the removal direction.

3 . The work machine according to claim 2 , wherein the spring is disposed between the support member and the boom coupling pin and continuously biases the boom coupling pin in the insertion direction.

4 . The work machine according to claim 3 , wherein the support member includes a boss section in which the support-side screw hole is formed, the boss section positioning the spring, the boss section being able to store inside a nut provided at a distal end of the manual operation member.

5 . The work machine according to claim 2 , wherein
the boom coupling pin has a proximal end at which a pair of slits is formed, the support member is inserted into and pass through the slits, and movement of the boom coupling pin is guided based on engagement between each of the slits and the support member.

6 . The work machine according to claim 5 , wherein the boom coupling pin is configured to be movable in the removal direction to a position at which each slit and the support member come into contact with each other in an axial direction of the boom coupling pin.

7 . The work machine according to claim 5 , wherein
the pair of slits is provided on an upper end portion and a lower end portion of the boom coupling pin, and the support member has an upper end portion and a lower end portion fixed to the booms via a fastening component and is inserted into and passes through the pair of slits from an upward and downward direction.

8 . The work machine according to claim 1 , further comprising a boom coupling mechanism configured to switch the boom coupling pin between the insertion state and the removal state, wherein
the boom coupling pin includes a pair of pins to be moved in synchronization with each other by the boom coupling mechanism, and when one of the pair of pins is manually operated while the pair of pins engages with the boom coupling mechanism, the pair of pins simultaneously moves in the removal direction of each of the pins.

9 . The work machine according to claim 1 , wherein the manual operation member includes a pressing section via which the boom coupling pin is to be pressed in the removal direction.

10 . The work machine according to claim 9 , wherein the manual operation member is continuously integrated into the boom coupling pin.

Assignees

• Tadano Ltd

Inventors

• Shirai Manato
• Zushi Masahide
• Toshiro Masahito

Classifications

• B66C23/705 Primary

  telescoped by hydraulic jacks · CPC title

• B66C23/708

  locking devices for telescopic jibs · CPC title

• B66C23/88 Primary

  Safety gear (for cranes in general B66C15/00; for rope, cable, or chain winding mechanisms B66D1/54) · CPC title