Abstract: A method and apparatus for isolating a zone (12) of a wellbore (14) penetrated by a casing (16) and then opening ports (28) in the zone (12) for extraction or injection of fluids is provided. The zone (12) is isolated by inflating jackets (42) and then closing a safety valve (38) by sliding a sliding member (44) relative to a first conduit (46). The ports (28) are opened by sliding a piston (80) of a sliding sleeve valve (76) so that openings (84) therein align with the ports (28). The invention provides improved zone isolation and reduced wear of seals (86) in the sliding sleeve valve (76).

Abstract: Apparatus for wiping moisture off the sides of running webs of photosensitive material in developing machines employs one or more deformable elastic wiping elements in the form of elongated lips or rings which are maintained in contact with the respective side or sides of the running web. Each wiping element extends transversely of the path of the running web and is imparted a movement having a component in a direction transversely of the running web. This reduces the likelihood of extensive localized wear upon the wiping element or elements.

Abstract: Apparatus for damping vibrations between at least two flywheels in the power train of a motor vehicle wherein one flywheel rotates with the output shaft of the engine and another flywheel can drive the input shaft of a transmission in response to engagement of a friction clutch. The flywheels are rotatable relative to each other against the opposition of one or more dampers which are installed in an annular chamber of the one flywheel. The chamber contains a supply of viscous damping fluid and the one flywheel has two disc-shaped sections which are made of sheet metal and define the chamber. The sections are welded to each other radially outwardly of the chamber.

Abstract: A self-locking connection between a bolt and a nut is obtained by making at least one face of at least one flight of the external thread of the bolt and/or the internal thread of the nut incongruous with the adjacent face of the other thread. This results in a clamping action along a helix at the root and/or at the crest of the other thread. The connection is self-locking in two directions if both faces of one or more flights of one of the threads are incongruous with the adjacent faces of the other thread.

Abstract: A safety guard for the nip of two neighboring rolls in a calender has an elongated support which is located in front of the nip and has two elongated strip-shaped barriers each adjacent but spaced apart from the peripheral surface of one of the rolls. The support is mounted on the bearings for one of the rolls for pivotal movement about an axis which is parallel to the nip and carries cams which are biased against rollers on the bearings for the other roll by one or more reversible motors. If the bearings for one of the rolls are moved relative to the bearings for the other roll, the cams move along the respective rolls and/or vice versa, whereby the orientation of the support and of the barriers thereon is changed so that the width of the clearances between the barriers and the peripheral surfaces of the adjacent rolls does not exceed a maximum permissible value such as would enable a careless operator to introduce a finger into the nip.

Abstract: Discrete light sensitive exposed but undeveloped sheets which are stacked in a dark box are transferred toward or into one or more developing machines by one or more suction cups which can jointly attract a single sheet at a time or each of which can attract the uppermost sheet of one of two or more stacks of sheets in the dark box. A suction cup which attracts a portion of the uppermost sheet of a stack in the dark box is caused to flex the attracted portion above and away from the sheet below the uppermost sheet in order to promote separation of the uppermost sheet from the remainder of the stack. The flexed uppermost sheet is then at least partially extracted from the dark box and is monitored to ascertain whether or not its underside adheres to one or more sheets.

Abstract: A caster wherein the underside of the web of the wheel frame is formed with a socket for a fulcrum which is integral with and is located between two arms of a wheel brake. One arm of the brake carries a shoe which can be moved into frictional engagement with the wheel in response to downward movement of a post forming part of an actuator which is concealable in the leg of a piece of furniture or the like. The other arm of the brake is biased in a direction to move the shoe away from the wheel by a tongue of a springy plate-like member which is affixed to the underside of the web and further comprises two prongs which retain the fulcrum in the socket. The hub of the wheel is concealed behind caps which are carried by the frame, and the fulcrum as well as the plate-like member and the brake are also concealed from view.

Abstract: An internal combustion comprises a cooling circuit of the cylinder heat and cylinder in the region of the upper dead center of the piston and cooling solely by oil injection into the cylinder in the lower region of the cylinder. The cooling circuit consists not or built-in-cooling channels but a separate component in the form of a jacket which together the cylinder and possibly the cylinder head forms the corresponding cooling chambers. To unify the thermal characteristics of the cylinder, a thermal insulation which may serve at the same time as acoustic insulation, is arranged in the lower part of the cylinder.

Abstract: A device for holding a drawer closed includes a fork-like member which is pivotable between an inoperative position and an operative position. When the drawer is open, the fork-like member is normally in the inoperative position. As the drawer is closed, a pin on the drawer engages a first tine of the fork-like member to thereby pivot the latter to the operative position in which the pin is engaged by a second tine of the fork-like member. The second tine biases the pin under the action of a spring so as to hold the drawer closed. A returning member is integral with the fork-like member and serves to return the fork-like member to the inoperative position if the fork-like member is unintentionally pivoted to the operative position while the drawer is open. The returning member is provided with a channel having a first open end adjacent to the fork-like member and a second open end which faces the pin when the drawer is open and the fork-like member is in the operative position.

Abstract: Apparatus for making stencils of the type having a rectangular frame and a woven fabric stretched upon and affixed to the frame for use in a screen printing machine has a table which supports four rows of neighboring fabric stretching devices surrounding a rectangular portion of the upper side of the table. Each stretching device has a support the underside of which abuts the upper side of the table, and a double-acting hydraulic or pneumatic cylinder and piston unit pivoted to the support and having a piston rod extendable toward and retractable away from the frame at the rectangular portion of the upper side of the table. The free end of each piston rod carries tongs having a pair of fabric-engaging jaws which stretch the fabric during retraction of the respective piston rod.

Abstract: A cutting implement for a mining machine includes a chisel and a holder for the chisel. The chisel has a flange which abuts the holder and is provided with a first recess. The holder has a second recess which registers with the first recess and communicates with a water supply channel in the holder. The second recess accommodates a hollow cylindrical seal. A tubular element bridges the two recesses and has a portion of smaller diameter which is received by the seal and a portion of larger diameter which is located in the first recess and confines the seal. The portion of larger diameter is embraced by a cap, and the cap carries a nozzle which is arranged to spray the cut made by the chisel. The seal, tubular element, cap and nozzle are all recessed from the outer peripheral surface of the chisel.

Abstract: A continuous tow of filamentary filter material is advanced past a rotary applicator which delivers metered but variable quantities of a second filter material (such as granulated or pulverulent charcoal) into successive increments of the tow. The tow and the delivered second filter material are thereupon draped into a web of wrapping material to form a filter rod which is sub-divided into sections of desired length. The density and/or the mass of the filter rod or of successive filter rod sections is monitored and the results of such monitoring operation are utilized to regulate the rate of delivery of second filter material so that the mass or density of the rod remains constant. The draw resistance of the filter rod or of filter rod sections can be monitored to generate signals which are used to regulate the rate of advancement of the tow toward the draping station and to thus maintain the draw resistance at least substantially constant.

Abstract: Apparatus for supplying stacks of paper sheets or the like to two or more packing machines has a platform for collection of successive rows of stacks, e.g., by arresting sheets forming part of discrete scalloped streams of sheets. Two or more discrete carriages for tongs are utilized to remove stacks in any desired grouping from the platform and to deliver them to two or more discrete removing units serving to transport the stacks to discrete packing machines. Each removing unit can employ a set of two or more aligned conveyors. Each carriage is or can be driven by a separate prime mover, each carriage can support two or more tongs, or each carriage can support a single tongs. All such undertakings contribute to versatility of the apparatus, namely the apparatus can be operated to ensure equal distribution of stacks among the removing units or one or more selected removing units can receive larger or smaller numbers of stacks than the other unit or units.

Abstract: Apparatus for eliminating or reducing occlusions or stenoses in veins and other body cavities has an elongated catheter with an ellipsoidal distal end having an internal anvil cooperating with a reciprocable hammer at the distal end of a flexible probe to drive the distal end of the catheter into an occlusion or into a stenoses. The proximal end of the probe is connected to the output element of a reciprocating unit which can be combined with a device for rotating the probe and/or the catheter. The distal end of the probe can be provided with an extension which projects beyond the hammer and beyond the distal end of the catheter to act upon a stenosis or upon an occlusion ahead of the distal end of the catheter.

Abstract: A front wheel drive for use in motor vehicles has an engine which extends transversely of the direction of forward movement of the vehicle. The output element of the engine drives the input component of a continuously variable chain or belt transmission with adjustable sheaves which drives a differential with two coaxial output components serving to drive the front wheels. The axis of rotation of the output element of the engine is normal to the axes of rotation of primary and secondary cones of the infinitely variable gearing, and to the axes of rotation of the output components of the differential. The axes of rotation of the output components are parallel to axes of rotation of the primary and secondary cones.

Abstract: A canned motor has a housing and a motor shaft which extends through the housing. A rotor is fixed to the shaft and is located in a rotor compartment within the housing. The rotor compartment has a flow path for circulation of a cooling and lubricating fluid through the compartment. A sleeve surrounds the shaft upstream of the flow path and is surrounded by a second sleeve. The two sleeves cooperate to define a gap which serves as a filter for fluid entering the rotor compartment. The minimum height of the gap is smaller than the minimum height of the flow path to prevent suspended solid particles which can obstruct the flow path from entering the latter. The sleeves are composed of a hard material so that oversized particles can be ground down by causing the fluid to repeatedly bring the particles into contact with the sleeves.