A shovel includes a lower traveling body, an upper turning body turnably mounted on the lower traveling body, a cab mounted on the upper turning body, an attachment including a boom attached to the upper turning body, a boom cylinder configured to drive the boom, a control device configured to control hydraulic oil flowable into the boom cylinder, and an information obtaining device configured to obtain information on the attachment. The control device is configured to increase the pressure of hydraulic oil flowable into the boom cylinder in accordance with the information on the attachment before a boom raising operation is performed.

A yoke of a dipper handle comprises a collar and a crowd pin aperture extending along a crowd pin aperture axis. First and second arms of the yoke include dipper pin lug apertures aligned along a dipper pin aperture axis parallel to the crowd pin aperture axis. The first and second arms of the yoke further include first and second pitch brace lug apertures aligned along a pitch brace aperture axis parallel to the crowd pin aperture axis. A first virtual reference line extends between the crowd pin aperture axis and the dipper pin aperture axis, while a second virtual reference line extends between the crowd pin aperture axis and the pitch brace aperture axis. An included angle α between the first virtual reference line and the second virtual reference line is between approximately 25 to approximately 51 degrees.

An excavator having a rotatable arm is disclosed. The excavator includes: a vehicle body configured to have a hydraulic pump; a boom connected to the vehicle body at one end thereof; a boom cylinder coupled between the vehicle body and the boom, and configured to receive hydraulic energy from the hydraulic pump and operate the boom; an arm connected to the other end of the boom; an arm cylinder coupled between the boom and the arm, and configured to receive hydraulic energy from the hydraulic pump and operate the arm; a bucket connected to an end of the arm; and a bucket cylinder coupled between the arm and the bucket, and configured to receive hydraulic energy from the hydraulic pump and operate the bucket. The arm includes: a first body, a second body, and a rotation module configured to enable the rotational movement of the second body.

The present invention provides a boom system 1 for breaking and manoeuvring oversize material. The boom system 1 is mounted or attached to a vehicle. The boom system 1 comprises a base 2, a column 5 protruding upwardly from the base 2 and a boom arm 3 moveably connectable to the upright column 5 at connection point 16. A moving arrangement 4 is provided to move all or part of the upright column 5 towards and away from the base 2 so that the connection 16 between the boom arm 3 and the upright column is moveable towards and away from the base 2. A mobile crusher comprising a boom system 1 for breaking and manoeuvring oversize material is also provided.

A working device is provided wherein a tilt bucket 70 is pivotally joined, vertically swingably, to the tip of an arm 33 by a third pivot joint pin P3 and is vertically swung by a bucket cylinder 38 via first link members 81A, 81B and a second link member 82. The connection unit 100 to be connected to the first link members 81A, 81B is pivotally joined, vertically swingably, to the tip of the bucket cylinder 38. By switching the connection position of connection pins 131A, 131B of the connection unit 100 and the first link members 81A, 81B selectively between the position of a connection hole H1 and the position of a connection hole H2, the swing range and excavating force of the tilt bucket 70 are switched.

A working device is provided wherein a tilt bucket 70 is pivotally joined, vertically swingably, to the tip of an arm 33 by a third pivot joint pin P3 and is vertically swung by a bucket cylinder 38 via first link members 81A, 81B and a second link member 82. The connection unit 100 to be connected to the first link members 81A, 81B is pivotally joined, vertically swingably, to the tip of the bucket cylinder 38. By switching the connection position of connection pins 131A, 131B of the connection unit 100 and the first link members 81A, 81B selectively between the position of a connection hole H1 and the position of a connection hole H2, the swing range and excavating force of the tilt bucket 70 are switched.

A shovel includes a lower traveling body, an upper turning body turnably mounted on the lower traveling body, a cab mounted on the upper turning body, an attachment including a boom attached to the upper turning body, a boom cylinder configured to drive the boom, a control device configured to control hydraulic oil flowable into the boom cylinder, and an information obtaining device configured to obtain information on the attachment. The control device is configured to increase the pressure of hydraulic oil flowable into the boom cylinder in accordance with the information on the attachment before a boom raising operation is performed.

The present invention provides a boom system 1 for breaking and manoeuvring oversize material. The boom system 1 is mounted or attached to a vehicle. The boom system 1 comprises a base 2, a column 5 protruding upwardly from the base 2 and a boom arm 3 moveably connectable to the upright column 5 at connection point 16. A moving arrangement 4 is provided to move all or part of the upright column 5 towards and away from the base 2 so that the connection 16 between the boom arm 3 and the upright column is moveable towards and away from the base 2. A mobile crusher comprising a boom system 1 for breaking and manoeuvring oversize material is also provided.

An excavator having a rotatable arm is disclosed. The excavator includes: a vehicle body configured to have a hydraulic pump; a boom connected to the vehicle body at one end thereof; a boom cylinder coupled between the vehicle body and the boom, and configured to receive hydraulic energy from the hydraulic pump and operate the boom; an arm connected to the other end of the boom; an arm cylinder coupled between the boom and the arm, and configured to receive hydraulic energy from the hydraulic pump and operate the arm; a bucket connected to an end of the arm; and a bucket cylinder coupled between the arm and the bucket, and configured to receive hydraulic energy from the hydraulic pump and operate the bucket. The arm includes: a first body, a second body, and a rotation module configured to enable the rotational movement of the second body.

The present invention relates to an excavator arm having a rotation device. The excavator arm is connected to a boom of an excavator to be operated by a cylinder, connected with a bucket for excavation at the lower end through a quick coupler, and connected with a bucket cylinder for operating the bucket over the arm. The arm is divided into an upper arm and a lower arm and a rotation device that selectively rotates the lower arm at predetermined angles over 360 in both directions is fixed between the upper arm and the lower arm.