A versatile attaching structure for connecting a tool such as a soil-displacing trough to a boom having an intermediate piece connectable to a boom and an operating cylinder and with interfitting connectors between the trough and the intermediate piece movable relative to each other by rotation of the intermediate piece and which are drawn into tightly locked relation for use by fastening members.

An excavator having a boom with slidably engaging base and beam parts is disclosed. The base part is mounted on a support part of the excavator for rotation about a horizontal axis; and a dipper arm which carries an excavating tool is pivotally suspended from the beam part. The base and beam parts are joined by channel section guides which permit sliding movement between the parts. A wedge member releasably fixes the relative position of the base and beam parts by wedgingly engaging both parts.

Measurement devices are provided on the boom and stick of an excavator and are diposed to measure, by means of the gravitational force, the angle of the boom and the stick, respectively, relative to the horizontal plane. These measurement values are applied to an evaluation instrument which indicates the excavation depth on the basis of the length of the boom and the stick and with the help of the received values. Furthermore, means may be provided to measure the lifting force exercised by the b...

This invention relates to excavating apparatus for use in the mining of bituminous sands, oil shale or other friable mineral deposits, and particularly adaptable for use in the "Fixed Arch Shield" mining technique. The excavating apparatus of the invention comprises a supporting framework having at least one excavator carrying member; guide means associated with that member; excavator support means constrained by the guide means for movement longitudinally of the member; means such as a hydrauli...

A mechanical excavator provided on a tractor or other vehicle and which comprises a main boom, which at its lower end is pivotally connected to a king post assembly for movement up and down in a vertical plane, a dipper arm pivotally connected to the outer end of the boom for movement in a vertical plane and carrying or being adapted to carry a bucket or like tool, the king post assembly providing for pivotal slewing movement of the main boom about a vertical axis so that the main boom can be ro...

A device for coupling a tooth and tooth-carrier. The device including three successive areas from the median portion of a coupling part to its free end. A first area comprises stepped straight guides that open on lateral outer surfaces of the coupling part. Following the first area is a second guiding area comprising revolution surfaces, opposed to one another. A third, terminal area is shaped as a prismatic rod having its axis coinciding with that of the coupling part.

A claw attachment for use in conjunction with the bucket of a backhoe or excavator for removing large boulders and other objects from the surface of the ground or from a partially embedded position within the ground. The claw is removably mounted in a fixed bracket on the earth moving machine and can be secured in a first or operative position on the "crowd" and then relocated to a second or storage position on said "crowd". In configuration, the claw resembles the claw of a Maine lobster, but w...

The present disclosure relates to an overload warning means for excavators, preferably hydraulic excavators or material handling devices, with three or more contact points, the contact forces being determined at the contact points such that they are brought into an order descending by the amount thereof, so that F.sub.1>F.sub.2>F.sub.3 > . . . >F.sub.n, and that the static stability is determined according to the following formula:.times..times..gtoreq. ##EQU00001##

A travel control device enables a crawler type hydraulic excavator to start slowly regardless of the preset speed ratio whenever the manipulation amount of a manual travel control device is small. The travel control device includes left and right travel motors respectively provided with speed changing mechanisms, a high speed shifting valve provided on a high speed signal line for cutting off or transmitting a high speed signal pressure to the speed changing mechanisms, a travel signal detection...

A lip for an excavating bucket has a row of sockets in each of which a respective excavating tooth is mounted, the center of the lip being relieved (i.e., offset with respect to the corners thereof) in two mutually perpendicular planes, such that the corner teeth do the initial excavating without interference from the center teeth, in both forward and lateral movements of the bucket. The combination of the shorter teeth used in the center of the lip plus the relief mentioned causes the corner te...