초록 ▼

A self-propelled rotary excavator having a plurality of booms forming a boom assembly attached to a chassis, with a rotary cutting device attached to the end of the boom assembly. The boom assembly positions the rotary cutting device at a desired position in regard to the chassis or moving portion o

A self-propelled rotary excavator having a plurality of booms forming a boom assembly attached to a chassis, with a rotary cutting device attached to the end of the boom assembly. The boom assembly positions the rotary cutting device at a desired position in regard to the chassis or moving portion of the self-propelled rotary excavator. The position of the rotary cutting device is maintainable (preferably controlled by lasers) so as to provide a ditch which has a constant grade regardless of the undulations of the land upon which the self-propelled rotary excavator traverses. An operator of the self-propelled rotary excavator can also independently control both the depth of the cut produced by the rotary cutting device and the distance in a direction perpendicular to the depth of the cut produced by the rotary cutting device. Such independent control of the boom assembly allows the operator of the self-propelled rotary excavator to provide a ditch which is capable of avoiding large objects which may damage the rotary cutting device or the operator may produce a special cut in the ditch such as a localized deep portion so as to act as a silt accumulator. Thus, the self-propelled rotary excavator provides a cutting device which is capable of cutting deeply into the soil to provide a deep drainage ditch, while operating over rough terrain.

대표청구항 ▼

1. An excavator comprising:a frame; a lateral telescopic boom assembly connected to the frame, said lateral telescopic boom assembly having a lateral telescopic stationary boom and a lateral telescopic extendable boom, said lateral telescopic extendable boom slidably connected to said lateral telesc

1. An excavator comprising:a frame; a lateral telescopic boom assembly connected to the frame, said lateral telescopic boom assembly having a lateral telescopic stationary boom and a lateral telescopic extendable boom, said lateral telescopic extendable boom slidably connected to said lateral telescopic stationary boom; a vertical boom assembly having a vertical telescopic stationary boom and a vertical telescopic extendable boom, said vertical telescopic stationary boom pivotally connected to said lateral telescopic extendable boom, said vertical telescopic extendable boom slidably connected to said vertical telescopic stationary boom; a rotary cutting head assembly pivotally attached to an end of said vertical telescopic extendable boom, said rotary cutting head assembly having a rotary cutting head rotor; a lateral telescopic extendable boom hydraulic cylinder pivotally connected to the frame at one end and at the other end contacting said lateral telescopic stationary boom; a lateral telescopic extendable boom hydraulic cylinder connected at one end to said lateral telescopic stationary boom and at the other end to said lateral telescopic extendable boom; and a vertical telescopic boom hydraulic cylinder attached at one end to said vertical telescopic stationary boom and at another end to said vertical telescopic extendable boom.