Abstract: A roadway barrier section includes a duct formed of two intersecting frusto-conical portions placed end-to-end so that the central portion thereof. The duct is formed using two tapering mold plugs that are preferably frusto-conical. The mold plugs are placed in a concrete form so that the lower edge of the duct is a straight line that is generally parallel to the base of the barrier section.

Abstract: A multiple sprocket wheel used as a unit in a two-wheeled vehicle and for a multi-speed gear without involving separation of a chain guard from a plurality of sprockets.

Abstract: A hydraulically operated dockboard comprising a ramp which is hinged at its rear edge to the frame of the dockboard, and a lip is hinged to the forward edge of the ramp. A main hydraulic cylinder unit connects the frame and the ramp, and by operating the cylinder unit the ramp can be pivoted upwardly from a horizontal cross traffic position to an upwardly inclined position. A lip cylinder interconnects the ramp and the lip and acts to pivot the lip from a downwardly hanging pendant position to an extended position. A hydraulic line is connected to the lip cylinder, and a control valve interconnects the hydraulic line to either a supply line or a return line that is connected to the reservoir of the hydraulic system. The control valve is normally biased to a first position where the lip cylinder is connected to the return line.

Abstract: A pair of reaction and guide roller are located between the toothed gears of two oblique shafts and act on the back of two branches of a toothed belt driving the gears, the axis of each roller being positioned at a substantially intermediate angularity with respect to the direction of the two shafts of the one and of the other toothed gear and being lined up with the axis of the belt teeth in the contact area with the rollers, the ratio between the distances of the pair of rollers from the gears being almost equal to the ratio between the diameters of the gears.

Abstract: An apparatus for effecting the firing of a multisection perforating gun having a plurality of vertically spaced shaped charges wherein the firing is accomplished from the lowermost shaped charge to the uppermost shaped charge. The detonation of the shaped charges is accomplished by a primer cord which is detonated only by a booster charge located in the bottom portion of the assembled perforating gun housing. Hollow nipples are utilized to effect the assembly of the plurality of tubular gun sections in axially stacked relationship and a fusible tubular guide element is provided between each adjacent pair of nipples so as to permit a continuous primer cord, as well as a fusible cord, to be concurrently inserted throughout the length of the gun.

Abstract: A rotary drill bit includes a cutting face having a peripheral edge and a central recess. A plurality of fluid discharge nozzles are mounted in bores in the cutting face. A plurality of cutter elements are mounted in the peripheral edge and in the recess to fracture an earthen core formed as the drill cuts through a formation. A plurality of lateral discharge passages extend radially through the bit body from said recess and extend longitudinally to the peripheral edge to form circumferential interruptions in the peripheral edge. Each passage includes leading and trailing edges at the cutting face. A convex protrusion is disposed centrally at a longitudinally inner end of the recess and includes a convex deflecting surface arranged to contact and fracture the earthen core and deflect the cuttings to the lateral discharge passages. The outer periphery of the cutting face is radially recessed to accommodate the flow of drilling fluid.

Abstract: An improved, multiple substantially identical countershaft assembly (16, 16A), change gear transmission (10) having at least two (20, 20A) countershafts is provided. The input gear (14) and each mainshaft gear (42, 44, 46, 48) is constantly engaged with a countershaft gear (24 and 24a, 26 and 26a, 28 and 28a, 30 and 30a, 32 and 32a) carried by each countershaft and all or substantially all of said input gear and mainshaft gears are provided with a number of gear teeth not evenly divisible by the number of countershafts whereby the level of noise generated by the meshing of the gear teeth is minimized.

Abstract: Apparatus for removing material from a surface, for use in association with a source of water at a pressure within the range of about 10,000 to 25,000 psi, the apparatus comprising, a carriage vehicle, extendable arm mounted on the vehicle and defining a free end, a nozzle being movable in a transverse direction, the nozzle including a housing and a rotatable nozzle mounted thereto, a hose connecting the source of water to the nozzle, a motor attached to the nozzle operable to rotate the nozzle, and an extender attached between the arm and the vehicle operable to extend and retract the arm relative to the vehicle.

Abstract: A well casing penetrator includes an elongated housing enclosing an outwardly movable hydraulic driven punch for cutting an opening in a casing. A high pressure liquid jet nozzle is mounted on the end of a hose which moves outwardly through an axial bore in the punch when extended through the casing to cut a radially extending opening in the surrounding earth. The punch includes longitudinal slots along opposite sides which cause tabs to be bent back along opposite sides of the opening cut in the casing to prevent dislodging of any portion of the casing from the casing as a consequence of the operation of the punch.

Abstract: A packer for a down hole oil well includes an inner mandrel assembly having an upper outer sleeve assembly that includes the hold down mechanism and upper packer seals with a piston on the underside of the packing seals to be pressure responsive and to deform the seals in response to pressure within the well string. Furthermore, a lower outer sleeve assembly has packing elements that are deformed and a setting mechanism to allow the packer to be set in a position within the well casing. Upper and lower unloading valves allow for fluid the bypass the packers when the packer is retrieved upward through the well casing.

Abstract: There is disclosed a kickover tool for use in running or pulling well tools respectively into or from a side pocket to one side of a bore through a mandrel connected as part of a well string.

Abstract: A bicycle chainguard having a housing shaped to cover the top run of a bicycle chain with a curved forward end portion extending at least partially around a front sprocket. The housing has a pair of keyhole-shaped through-slots formed in a vertical wall. Clamps encircle seat and down tubes on the frame of the bicycle. Each clamp has a lug extending into a corresponding through-slot. Each lug has a shank with a diameter sized to fit within the through-slot, and an enlarged head sized to pass through an enlarged end portion of the keyhole-shaped through-slot. The longitudinal axis of each through-slot is oriented tranversely to the axis of the corresponding frame tube enabling assembly of the lug in the slot in a wide range of positions along the axial length of the through-slot to accommodate a range of angular orientations of the frame tubes for different model or style bicycles.

Abstract: A variable speed drive pulley comprises a hub and two annular flange plates around the hub in face-to-face relationship. One of the flange plates is mobile axially relative to the hub. An annular diaphragm of variable cone angle has a peripheral part forming a Belleville spring washer and a central part divided into radial fingers. The Belleville spring washer bears axially on the mobile flange plate through a connection piece and an elastic material annular spacer to which the connection piece is attached. The radial fingers bear on a support piece fixed axially with respect to the hub. A fluid-tight regulating chamber is formed between the mobile flange plate, the diaphragm, the support piece and the hub. It is adapted to be connected to a source of fluid. Sealing means in one piece with the elastic material space are disposed between the connection piece and the mobile flange plate.

Abstract: A freewheel for a cycle or the like, comprising a hollow body of generally circular shape which receives on its periphery at least one gearwheel retained laterally between two flanges, means also being provided for securing the gearwheel to the body in a manner precluding relative rotation.At least one of the flanges comprises a metal part which is accommodated, by permanent deformation, in a groove on the periphery of the body.

Abstract: The invention provides an adaptor which comprises a hexagonal tail portion adapted to engage in a drilling machine, and a leading portion which is adapted to receive a circular drill rod in locking relationship. Sealing means is provided between the drilling machine and the adaptor and the latter and the drill rod.

Abstract: It is a matter of a variable speed drive pulley with which is associated a regulating chamber adapted to be connected to a source of fluid, this regulating chamber being sealed in particular by a seal which, coupled axially to the mobile flange, is disposed in line with an abutment spacer also defining one of the extreme positions of the mobile flange. The abutment spacer is carried by the bush of the mobile flange on the side of the bush facing the other flange, it features a transverse collar which is directed radially towards the axis of the assembly and by which it delimits, for its part, a housing in which is disposed the associated seal and, conjointly, passages are provided in a generally radial direction in said bush and the hub of the assembly.

Abstract: A direction and angle maintenance tool and a method for using same are provided for drilling directionally oriented boreholes. The tool generally comprises a mandrel and a sleeve, which is rotatably attachable around the mandrel. The mandrel has a longitudinal bore and is attachable at its upper end to a rotary drill string and at its lower end to a rotary drill bit sub which is attached to a rotary drill bit. The sleeve has an eccentric longitudinal bore, forming a heavy, or weighted, side of the sleeve. A gauge insert is provided which is longitudinally attachable to the weighted side of the sleeve. By varying the size of the insert, the angle of deviation of a directionally drilled borehole may be maintained or adjusted. A self-adjusting blade may be added in order to aid in maintaining a desired angle of deviation or to induce a desired change of direction.

Abstract: A lower formation of a multizone well is perforated by a perforating gun lowered by wireline, and then fractured. A packer (modified Pengo packer) with a central bore and a valve seat is positioned within the casing between the lower and upper formations. A plug is set into the packer valve seat by a perforating gun and released by shearing a shear pin. The well is pressurized to maintain the plug in the valve seat, the perforating gun raised, and the casing opposite the upper formation perforated. The gun is removed, and the upper formation fractured. After a suitable flow-back period, another packer is then positioned in the casing above the upper perforated formation. The pressure differential between formations maintains the plug seated, allowing the upper formation to be produced. When a change in pressure differential raises the plug off the valve seat, the lower formation may be produced.

Abstract: An echo ranging gun (10) is disclosed which is useable with high pressure gas wells having gas pressure exceeding 15,000 psi. The gun (10) is connected to the needle valve (30) typically encountered on a well having high pressure. The needle valve can have a diameter as small as approximately 1/8 inch. The gun (10) has a passage (38) which is exposed to the gas in the wellbore (14) and a volume chamber (46). A poppet valve (56) is movable between open and closed positions in the volume chamber by rotating a wing handle (88) connected to a head (78) within the volume chamber (46) which has a ramp (80) to contact the poppet valve (56) to move the valve to the closed position. A bleed valve (112) is used to bleed the wellbore gas from the volume chamber to create a predetermined pressure differential between the passage (38) and volume chamber (46). Further rotation of the wing handle (88) causes the poppet valve (56) to be released from the ramp at a down step (86).

Abstract: A retrievable well safety valve in a cased well system including a tubing string, a dual packer downhole around the tubing sealing with the casing and submersible pump in the tubing string below the packer.The safety valve controls flow of pumped fluids through the tubing to surface and directs gas flow into the casing annulus above the packer. When the safety valve is landed in cooperating tubing nipples above the packer, separated central annular flow passages are formed for pumped fluids and gas respectively.A ball valve in the central flow passage controls pumped fluid flow therethrough and an annular valve coupled to the ball valve controls gas flow from below the packer through the annular flow passage around and by the ball valve.When the ball valve is in the down and open position, the valve ball member engages a lower seat, which maintains the central and annular flow passages separate and prevents comingling flow of fluids and gas.