A breakout wrench for drilling apparatus includes a pivotably mounted slide arm upon which a carriage is slidably mounted and a set of wrench jaws which are attached to a wrench arm swingably disposed upon the carriage for engaging and loosening a drill string section of the drilling apparatus. A hydraulic cylinder associated with and disposed beneath the slide arm is attached to the carriage to provide movement of the carriage along the slide arm and impart a wrenching movement to a drill strin...

A papermaking fabric woven from synthetic monofilaments is shown in which the warp threads pass under one and then over three weft threads in a repeated pattern, and the weft threads alternate in diameter to develop a fabric wear surface that is uneven with the average level of the smaller diameter weft threads being receded into the fabric to a greater degree than for the larger weft threads.

A hydraulic crowd cable take-up system for the crowd mechanism of an excavator shovel includes a hydraulic actuator that urges a cable support means against the crowd cable. In a first embodiment operating fluid is supplied to the blind end of the actuator via a stop valve that is automatically or manually activated to control the take-up of the cable automatically. In a second embodiment operating fluid is also supplied to the rod end of the actuator.

A compensated high voltage suppressor for insertion in a transmission line is shown for shunting large interference voltages from the line to ground. The suppressor has a varistor material through which the large interference voltages are shunted, and this material also functions as a capacitor dielectric. Additional circuit components are connected with this capacitance to form a low pass filter in the transmission line which has a characteristic impedance substantially matching the line charac...

A diverter spout is shown in which the diverter mechanism reciprocates vertically within a chamber of the spout and includes a valve stem with a valve head at the lower end and a piston at the upper end. When the diverter mechanism is raised into a diverting position the valve head mates with a valve seat to cut-off water flow from the spout, and the piston is moved into a position wherein water pressure is removed from its upper side, so that pressure on the lower side is sufficient to retain t...

A truck mounted, extensible, telescopic boom is rotatably connected to a turret and pivoted about an axis by an elevation cylinder. In one embodiment, the length of the boom is altered in response to changes in elevation by an extension cylinder which connects to an outer boom section and to the turret at a point substantially above the boom pivot axis. In a second embodiment, the same action is obtained with an extension cylinder connected to a trolley which is slidably mounted to the boom. The...

A piano hinge type metal belt conveyor has hollow hinge rods connecting adjacent conveyor plate sections. Left and right hand roller chain assemblies each include a plurality of shafts each mounting sleeve bearings and rollers on the sleeve bearings. The shafts are interconnected by overlapping side wings each mounted at one end about one of the shafts and at its other end about the sleeve bearing on an adjacent shaft. Overlapping chain links disposed to the outside of the rollers may also be us...

An equalizer assembly for maintaining tension in the chains used to drive a drill stem rotating mechanism of a blast hole drill has two spaced, floating equalizer frames, each of which includes a pair of chain engageable sprockets. An equalizer bar connected between the frames is pivotally attached at its midpoint to a slide member actuated for vertical displacement by a hydraulic cylinder, this arrangement enabling the equalizer frames to shift in response to variable chain pressures in order t...

A removable extensible outrigger assembly of the type including opposite vertical jacks has one jack rotatable to a horizontal position so that the assembly can be removed sidewardly from beneath a carrying vehicle. In one embodiment, the extensible outrigger beam is split into two sections that are normally locked together; and there is a cylindrical cam connection between the extension cylinder and outer section so that extension of the cylinder when the sections are unlocked causes the outer ...

A diving plane comprising a central upright rudder and inclined deflection plates extending outwardly from each side thereof is attached to a fishing line which is to be suppressed to a desired depth. The central rudder has a releasable retaining mechanism including resiliently biased opposed jaws to receive a down rigger wire having a relatively heavy weight secured thereto. As the boat moves through the water, the diving plane slides down the wire as a result of the flow of water over the incl...