A traverse head for a rotary drill rig includes a motor and gearcase supported by and drivably connected to a rotatable shaft disposed on a frame. The shaft includes a pair of spaced apart pinions drivably engaged with a pair of parallel gear racks mounted on an elongated mast whereby the traverse head may be driven along the mast to perform pulldown and hoisting movements on a drill stem. The traverse head includes a motor and gear housing mounted on the frame and connected to the drill stem. T...

Disclosed is a digger attachment for a tractor including a frame having at one end of a frame arm a three-point mount for securing the digger to the tractor. The opposite end of the frame arm supports an auger for pivotal movement about a transverse axis. Attached to the head of the auger is a shaft which extends through a bracket mounted on the frame arm. Coil springs are provided about the shaft on opposite sides of the bracket with the opposite ends of the springs butting against nuts threade...

A rock drill feed shell is slidably mounted on a support bracket and is connected to a feed screw which is threaded through a feed nut mounted on an elongated supporting tube disposed telescopically within the feed shell. The supporting tube is displaceable with respect to the support bracket by a feed extension cylinder mounted on the support bracket. A rock drill is slidably mounted on the feed shell and engages a second feed screw supported by the feed shell. A feed motor is drivably connecte...

A rock drill feed support beam comprises longitudinal side plates and a base member which are formed of folded metal plate welded together to form a channel-like support beam with a substantially clear unobstructed space between the members for containing a plurality of pressure fluid hoses which are trained over a hose guide supported by the feed beam and also disposed generally between the side members in the space. A feed mechanism comprising an endless chain is disposed in the channel-like s...

A lightweight portable drilling apparatus capable of being assembled and disassembled for lifting and moving by helicopter. The apparatus includes a center vertically-oriented drilling tower equipped with a rotary drilling assembly, and having a base supported by a plurality of adjustable leveling legs. Also included is a first module pivotally coupled to one side of the tower base and supported by a flexible tether attached to the module and the drilling tower near the top thereof, and a second...

A drill assembly particularly suitable for use in building construction. The assembly includes an upright framework supporting a vertically moveable carriage. A rotatable, first threaded rod extending transversely between two forwardly projecting, horizontal arms of the carriage carries a threaded traveling member to which is attached a forwardly projecting horizontal shaft. A drill motor connected with the forward end of the shaft may be selectively pivoted between positions in which the drill ...

A tensioning mechanism for the fluid conductor hoses of a feed mounted rock drill comprises a plurality of fluid cylinders mounted stationary on a bracket supported midway along the length of the drill feed channel. Elongated tubular pistons are slidably supported in the cylinders and are connected to the respective hoses. The cylinders may be charged with pressure fluid such as grease or the like to bias the pistons to tension the hoses and prevent damage to the hoses or interference with movem...

A venetian blind includes a covering unit, and a cord-winding device. The covering unit includes a plurality of slats and two lifting cords. The cord-winding device includes a casing fixed on the headrail, a plurality of spring-surrounding members disposed rotatably within the casing, a plurality of co-rotatable gears sleeved respectively and fixedly on the spring-surrounding members, and a spiral spring disposed within one of the spring-surrounding members. The spiral spring is disposed within ...

A window shade lift cord apparatus includes a seat, a control switch and a cord assembly. The seat has an aperture on the bottom and axles in the interior. The control switch includes an anchor member and a depressing member that are movably coupled together and interposed by an elastic element. The anchor member and the depressing member have respectively two through holes and two openings. The cord assembly has cords treading through the aperture of the seat, through holes and openings of the ...

A winding device for a Venetian blind includes at least one support seat secured to a headrail to correspond to the position of at least one pull cord and having an inside formed with a through hole and a side formed with a guide hole, and at least one slide bushing mounted on a drive shaft to rotate therewith and pivotally mounted in the through hole of the at least one support seat. Thus, the wound pull cord pushes the slide bushing to move relative to the support seat during rotation of the s...