Crawler crane car body weight supporting device

• US 10,618,781 B2
• Filed: 02/08/2016
• Issued: 04/14/2020
• Est. Priority Date: 02/10/2015
• Status: Active Grant

• Current Assignee: Kobelco Construction Machinery Company Limited (Kobe Steel Limited)
• Original Assignee: Kobelco Construction Machinery Company Limited (Kobe Steel Limited)
• Inventors: Miyazaki, Kazuyuki
• Primary Examiner(s): Gallion, Michael E
• Application Number:
  US15/545,753
• Publication Number:
  US 20180022585A1
• Time in Patent Office: 1,527 Days
• CPC Class Codes: B66C 23/76 and movable to take account of variations of load or of variations of length of jib
• CPC Class Codes: B66C 23/80 hydraulically actuated

Abstract

In a car body, a lower travelling body of a crawler crane includes a pair of left and right crawler frames, the car body connecting the crawler frames and supporting an upper slewing body, and a pair of car body weights are disposed on front and rear sides of the car body. The car body supporting device includes a supporting mechanism for movably supporting at least one of the paired car body weights, and a drive section for moving the car body weight supported by the supporting mechanism to thereby shift a center of gravity of the lower travelling body in a front and rear direction. The car body weight supporting device can improve postural stability.

Claims

1. A car body weight supporting device for a crawler crane including:

a lower travelling body;

an upper slewing body slewably mounted on the lower travelling body;

an attachment having a proximal end supported on a front portion of the upper slewing body in a raisable and lowerable manner; and

a counter weight disposed on a rear portion of the upper slewing body, the lower travelling body having a pair of left and right crawler frames each carrying a crawler, a car body connecting the crawler frames and supporting the upper slewing body, and a pair of car body weights disposed on front and rear sides of the car body, the car body weight supporting device comprising;

a supporting mechanism for movably supporting at least one of the paired car body weights; and

a drive section for moving the car body weight supported by the supporting mechanism to thereby shift a center of gravity of the lower travelling body in a front and rear direction.

2. The car body weight supporting device for a crawler crane according to claim 1, wherein

the supporting mechanism supports the car body weight movably in a vertical direction between a normal position at which the car body weight lies above the ground and a ground position at which the car body weight comes into contact with the ground.

3. The car body weight supporting device for a crawler crane according to claim 2, wherein

the drive section is operable to push the car body weight against the around at a specified pressure when the car body weight is at the ground position.

4. The car body weight supporting device for a crawler crane according to claim 1, wherein

the supporting mechanism supports the car body weight movably in the front and rear direction between a close position at which the car body weight lies close to the car body and a distant position at which the car body weight lies at a greater distance from the car body than at the close position.

5. The car body weight supporting device for a crawler crane according claim 2, wherein

the supporting mechanism supports the car body weight movably in the front and rear direction between a close position at which the car body weight lies close to the car body and a distant position at which the car body weight lies at a greater distance from the car body than at the close position.

6. The car body weight supporting device for a crawler crane according claim 3, wherein

the supporting mechanism supports the car body weight movably in the front and rear direction between a close position at which the car body weight lies close to the car body and a distant position at which the car body weight lies at a greater distance from the car body than at the close position.