A drilling head includes a tubular body having removable means for sealing the body to a kelly or other drive tube, a drive bushing releasably mounted in the sealing means to turn the sealing means with the drive tube, the sealing means including a seal tube having a rotating seal means for sealing with the body and a non-rotating seal means for sealing with the drive tube, both seal means being releasably held to the seal tube by common retainer means, such sealing means being rotatably mounted...

An article of apparel specifically designed to be worn on or about the head of a wearer and comprising in essence a combination head band and shade producing element extending outwardly therefrom. A support band is specifically configured to be disposed in surrounding relation to the upper portion of the wearer's head in somewhat conventional fashion. A visor is at least partially defined by a flexible material pouch specifically configured to have mounted therein a visor support element so as t...

A drilling head comprises a tubular body adapted for connection above a well head and having a removable side outlet with a replaceable wear bushing. An assembly removably secured in the head includes a stator and rotor with bearing means and rotating seal means therebetween. A replaceable tubular, kelly seal boot or stripper carried by the rotor includes an enlarged upper end which diverts drilling mud away from the rotating seal and toward the side outlet.

A drilling head includes a tubular body with top, bottom and side openings. A top closure closes the annulus between a portion of the head above the side opening and a drive tube such as a kelly extending through the head. The top closure includes a rotor, adapted to form a non-rotating seal with the kelly, and a stator, with a rotating seal between the stator and rotor. The stator is supported on and releasably connected to the body. The rotor includes a seal tube rotatably supported by inboard...

A thermode (12) of a thermocompression bonding head (11) is adjustably mounted to a frame (35). A bonding tip (26) of the thermode (12) rests against a reference surface (17). After an initial adjustment of the thermode (12) with respect to a bonding platform (37), the bonding tip (26) may be removed from the thermode (12) and replaced by another identical tip (26) without a need for readjusting the thermode (12) with respect to the bonding platform (37). A comparatively large interface surface ...

A cylinder device such as a hydraulic shock absorber, a gas spring or the like having a main body having an open end, a closure member screw-threadedly engaging the open end, of the main body, a rod guide disposed inside of the closure member, a piston rod extending slidably through center bores formed respectively in the closure member and the rod guide, pressurized fluid enclosed in the cylinder device, and a seal member interposed between the rod guide and the closure member. An escape passag...

A measurement electrode head system is disclosed for connection to electrodes for electrochemical potential measurement. The head includes an electrode cap for connection with glass and plastic electrode rods. A coaxial cable having an outer shielding conductor and an inner conductor connects to the cap. A plastic jacket is integrally molded onto one end of the coaxial cable. The jacket has a continuous electrically conductive shielding layer adjacent an inside surface thereof and the inner cond...

There is disclosed a print head including a one-piece support block or mounting block having a support member and a concave surface for rotatably mounting a series of drive wheels, the drive wheels being coupled to a series of printing bands which are trained about the respective wheels and the support. The support includes four abutment shoulders and each printing band is provided with a series of lugs on its underside having end faces cooperable with the abutment shoulders when the printing ba...

A drilling head includes a tubular body with top, bottom and side openings. An oriented side outlet with an oriented replaceable bushing is releasably connected to the side opening. The head without the side outlet will pass through most rotary tables. A top closure closes the annulus between a portion of the head above the side opening and a drive tube such as a kelly extending through the head. The top closure includes a rotor, adapted to form a non-rotating seal with the kelly, and a stator, ...

A spray head suitable for spraying thickened colliery tailings onto a fluidized combustion bed includes a central aperture for the egress of gas directed towards and surrounded by an annular orifice for the discharge of the material to be sprayed. As the material issues forth in use from the orifice a gas flow from the central aperture impinges upon it to generate the spray the characteristics of which may be varied by altering the size and/or location of the central aperture. An annular apertur...