When it is confirmed that a distal end portion of an attachment has reached a predetermined distance detection start position apart from a cab on the basis of a posture of the attachment detected by posture detector, a control apparatus determines whether or not an object to be detected has reached a predetermined stop position closer to the cab than the distance detection start position on the basis of a distance of the object to be detected by a distance detection sensor, and controls the drive unit so as to stop the attachment when determining that the object to be detected has reached the stop position, and the control apparatus controls the drive unit so that the speed of the distal end portion of the attachment becomes a predetermined target speed or lower when the distal end portion of the attachment reaches the distance detection start position.

An apparatus for lifting and lowering manhole covers is shown and described. The apparatus for lifting and lowering manhole covers includes a main beam secured to a vehicle connection support. A winch is secured along the main beam. The winch is configured to secure to a manhole cover. A support leg secured to the main beam such that the winch is positioned between the vehicle connection support and the support leg.

An apparatus for lifting and lowering manhole covers is shown and described. The apparatus for lifting and lowering manhole covers includes a main beam secured to a vehicle connection support. A winch is secured along the main beam. The winch is configured to secure to a manhole cover. A support leg secured to the main beam such that the winch is positioned between the vehicle connection support and the support leg.

Present embodiments relate to an apparatus and method which separates tie plates. More specifically, and without limitation, present embodiments relate to a tie plate separator which can retrieve tie plates from a pile and separates such for placement on a feeder, such as a conveyor for sequential feeding of the tie plates.

Present embodiments relate to an apparatus and method which separates tie plates. More specifically, and without limitation, present embodiments relate to a tie plate separator which can retrieve tie plates from a pile and separates such for placement on a feeder, such as a conveyor for sequential feeding of the tie plates.

A work machine includes a traveling undercarriage, an upper rotating structure swingably mounted on the traveling undercarriage, a cab mounted on the upper rotating structure, an attachment including multiple work elements and attached to the upper rotating structure, an end attachment attached to the end of the attachment, a first sensor configured to obtain the angles of rotation of the work elements, a second sensor configured to obtain the angle of rotation of the end attachment, and a control device configured to restrict or stop the motion of reducing a distance between the end attachment and the cab in response to determining that the end attachment has entered a predetermined region based on the outputs of the first sensor and the second sensor.

A lifter with electro-permanent magnets is provided. It has an external bearing structure closed at the bottom by a plate, provided with a heat shield, and pole pieces secured under the respective poles and protruding from the bottom plate. Each of the electro-permanent magnets has a reversible magnet arranged on top of one of the poles, of a fixed polarization magnet formed by a plurality of blocks placed along the lateral faces of the pole and of a coil arranged around the reversible magnet to cause the reversal of the polarization of the latter by means of an electrical pulse. An airtight air gap between 1 and 4 mm high is formed between each pole piece and the respective pole through the interposition of a plate of thermal insulation material that resists high temperatures provided at each pole with a rectangular window slightly smaller in size than the pole itself, with the top sides of the pole pieces and/or the bottom sides of the poles being provided with peripheral recesses suitable to act as seats for the positioning of the plate.

A lifter with electro-permanent magnets is provided. It has an external bearing structure closed at the bottom by a plate, provided with a heat shield, and pole pieces secured under the respective poles and protruding from the bottom plate. Each of the electro-permanent magnets has a reversible magnet arranged on top of one of the poles, of a fixed polarization magnet formed by a plurality of blocks placed along the lateral faces of the pole and of a coil arranged around the reversible magnet to cause the reversal of the polarization of the latter by means of an electrical pulse. An airtight air gap between 1 and 4 mm high is formed between each pole piece and the respective pole through the interposition of a plate of thermal insulation material that resists high temperatures provided at each pole with a rectangular window slightly smaller in size than the pole itself, with the top sides of the pole pieces and/or the bottom sides of the poles being provided with peripheral recesses suitable to act as seats for the positioning of the plate.

A system for handling pipes on a drilling rig includes an elevator suspended from a stand transfer vehicle, a top drive or other lifting device of a drilling rig. The system also includes a rig-floor pipe lifting machine including a fork sized to engage a tool-joint of a pipe. A navigation system includes a controller that can be programmed to autonomously drive the rig-floor pipe lifting machine.

Magnetic coupling devices are disclosed which may be configured in at least three states. The various states may be provided through one or more of altering a position of a permanent magnet relative to another permanent magnet and altering a current level in a coil surrounding a permanent magnet.