Abstract: Improved magnetic toner resolution obtained with vacuum device with terminal lips having squared off edges with lips parallel to rotation axis of printing plate but offset at angle of 5.degree. to 60.degree..

Abstract: An annular blowout preventer for use on an oil or gas well rig having a lower housing, an upper housing, a resilient sealing means, a vertical bore coaxially positioned through the housing and a vertically acting piston for actuating the sealing means in which the inner surface of the upper housing and the inner surface of the lower housing are concentric spherical surfaces extending to the bore. The resilient sealing means includes steel segments extending between the top and bottom of the sealing means and the top and bottom of the sealing means and the steel segments have spherical surfaces coacting with the spherical surfaces on the upper and lower housings. The upper and lower housings each include a vertical wall extending downwardly from the spherical surfaces on the upper and lower housing and the vertical moving piston sealingly engages the vertical walls.

Abstract: An annular blowout preventer for use on an oil or gas well rig having a lower housing, an upper housing, a resilient sealing means, a vertical bore coaxially positioned through the housing and a vertically acting piston for actuating the sealing means in which the inner surface of the upper housing and the inner surface of the lower housing are concentric spherical surfaces extending to the bore. The resilient sealing means includes steel segments extending between the top and bottom of the sealing means and the top and bottom of the sealing means and the steel segments have spherical surfaces coacting with the spherical surfaces on the upper and lower housings. The upper and lower housings each include a vertical wall extending downwardly from the spherical surfaces on the upper and lower housing and the vertical moving piston sealingly engages the vertical walls.

Abstract: A locking mechanism for securing the upper housing of an annular blowout preventer to the lower housing. A split latch ring having a plurality of angled teeth cut in its outer diameter is expandable into the lower housing which is provided with a plurality of locking grooves contoured to mate with the teeth. A locking ring with a tapered outer surface mates with a tapered inner surface on the latch ring for expanding the latch ring. Bolting the inner locking ring to the upper housing causes downward movement of the locking ring forcing the latch ring outwardly and down the taper of the engaging teeth. The upper housing is locked to the lower housing as the upper housing has a shoulder engaging the lower edge of the downwardly moving latch ring causing seating of the upper housing on to the lower housing and compensating for variations in machining tolerances.

Abstract: A ram lock for blowout preventer rams which permits locking of the ram at multiple and adjustable positions. Automatic locking of the ram at a desired position, such as in adjustable sealing positions to compensate for ram elastomer wear, is obtained. The ram also automatically unlocks in response to opening fluid pressure acting on a cylinder liner which contains a ram carrier moving the ram.

Abstract: An annular blowout preventer for use on an oil or gas well rig having a lower housing, an upper housing, a resilient sealing means, a vertical bore coaxially positioned through the housing and a vertically acting piston for actuating the sealing means in which the inner surface of the upper housing and the inner surface of the lower housing are concentric spherical surfaces extending to the bore. The resilient sealing means includes steel segments extending between the top and bottom of the sealing means and the top and bottom of the sealing means and the steel segments have spherical surfaces coacting with the spherical surfaces on the upper and lower housings. The upper and lower housings each include a vertical wall extending downwardly from the spherical surfaces on the upper and lower housing and the vertical moving piston sealingly engages the vertical walls.

Abstract: A new and improved ram lock for blowout preventer rams which permits locking of the ram at multiple and adjustable positions to compensate for wear on sealing elements of blowout preventer rams and increase sealing action of the ram without requiring separate special control lines. Automatic locking of the ram at a desired position, such as in adjustable sealing positions to compensate for ram elastomer wear, is obtained.

Abstract: A pattern control or programming device for a lawn sprinkler having a nozzle-equipped body rotating or oscillating on a generally vertical axis and having a movable guide element for controlling the elevation of discharge of water from the nozzle. A cam having a variable cam surface contour is engaged by a cam follower which imparts movement to the guide element to vary the elevation of water discharge from the nozzle at desired positions of the nozzle during rotary or oscillatory movements of the sprinkler body. A cam mounting structure operates to hold the cam in desired set contours of the cam surface.