Abstract: A cementitious conduit is formed in situ in a ditch or the like by defining an elongated volume of annular cross-section within the ditch with the axis of elongation of the annular volume extending along the ditch and with one end of the annular volume closed and the other end thereof open. A solidifiable cementitious material is introduced into the annular volume at the closed end thereof and such cementitious material is continuously urged to move toward the open end thereof at a rate at least equal to a given rate. Simultaneously, the volume is moved along the ditch at such given rate with the closed end thereof preceding the open end thereof and circumferential frictional forces are applied to the cementitious material at the inner surface of such annular volume.

Abstract: A control system for a vehicle includes fluid pressure actuated brakes and a fluid-pressure engaged transmission. A pair of brake pedals is provided, the first actuating the brakes only, and the second actuating the brakes and also operating a valve for releasing transmission pressure upon application of the second brake pedal, and holding transmission pressure upon release of the second brake pedal. Such valve is operated by transmission of movement of the second brake pedal to a movable valving element, with means provided so that for a given movement of the second brake pedal, the valving element moves less, to provide a degree of valve sensitivity. Adjustment means are associated with the second brake pedal and valving element, to synchronize the operation of the brakes with the engagement and disengagement of the transmission.

Abstract: A piston, such as that used in an axial and/or radial piston hydraulic translating unit, comprising a hollow-skirt portion having inner surfaces defining a substantially conical cavity filled with a core of lightweight material, the material being retained in place by snap rings resiliently mounted into annular grooves formed on the inner surfaces of the skirt portion, which mechanically interlock the core material with the piston.

Abstract: A cable cleaning device equipped with a housing means having a through hole for a cable. The housing means is divisible in the direction of the diameter of the cable and accomodates therein a cleaning means of an elastomeric material composed of at least two segments and surrounding the peripheral surface of the cable. The segments of the cleaning means are movable in the direction of the cable diameter, and urged against the peripheral surface of the cable by a spring means within the housing means whereby the cleaning means comes into elastic engagement with the peripheral surface of the cable passing through the through hole and cleans the cable.

Abstract: An earth ripping apparatus is provided with a replaceable ripper tip which is releasably attached to the lower end of a shank latching means which functions in cooperative association with a wear plate carried along the leading edge of the shank.

Abstract: A control system for circle mounted motor grader blades to enable adjustment of the circle and blade supported thereby about the axis of the circle is disclosed. The system includes a circle holding mechanism for reducing wear between the circle and the mounting structure therefor, which circle holding mechanism also automatically compensates for inaccuracies in operation due to such wear and to the tolerances between the circle and the mounting structure required to facilitate adjustments in the relative positioning thereof. This circle holding mechanism includes a wedge device which forces the circle into a shoe element to hold the circle in fixed relationship with respect to the mounting structure therefor.

Abstract: A valve is used in a system employed on a vehicle for effecting the selected automatic disengagement of the transmission or main clutch upon the application of the vehicle service brakes, as well as the reengagement of the transmission when the brakes are released. Such valve allows rapid pressure buildup to the brakes, so that they may be rapidly applied, but delays the release of the brakes to allow ample time for reengagement of the transmission.

Abstract: A mounting assembly for the mast of a lift truck includes a pair of spaced apart hanger bracket members secured to the truck and including upwardly opening pivot pin receiving slots. A pair of pivot pins are rotatably supported in a pair of brackets on the mast frame and are received within the upwardly opening slots. Means are provided on the pins to prevent axial and rotational movement thereof relative to the hanger brackets. Retainer means for retaining the pins within the slots comprises a block disposed above the pin and secured to the hanger bracket by a screw accessible solely from above the pin and between the mast and truck.

Abstract: A roller follower system for valves, camming devices and the like including a pair of substantially cylindrical follower members each having at least one flat surface machined thereupon. The system includes a one-piece spring material retaining means for preventing the rotation of the roller follower members during reciprocation thereof which retainer means coact with the flat surfaces of the roller follower members and which retainer means require no machining of parts for installation and use other than the roller follower members. The retainer means is generally U-shaped and has bend portions at the distal portions of its legs and reverse bends at the proximal portions of its legs for facilitating its installation and removal.

Abstract: A bulldozer assembly comprises a pair of laterally spaced push arms pivotally mounted at their forward ends to a blade. A stabilizing member is secured to each of the push arms and the members are disposed rearwardly of the blade in disconnected relationship therewith. The inboard ends of the stabilizing members are pivotally connected together by a transverse pivot pin disposed one-half the distance between the ends of the push arms. In a first embodiment, the pivot pin is confined within the stabilizing members whereas in a second embodiment the pivot pin extends completely through the stabilizing members and into the push arms.

Abstract: A control system for a spring-applied service brake which can also be used as a parking brake. Pressure from the vehicle hydraulic system is normally used to release the brakes. In the event of a loss of the primary pressure from the hydraulic system, the control system switches automatically to use of secondary pressure from the vehicle compressed air system to release the brakes, while maintaining the ability of the operator to apply the brakes by normal operation of the service and parking brake controls.

Abstract: A video film projector has a pin registration transport mechanism which employs inherent spring means in a loop of film to advance the film, and a synchronizing shutter to inhibit projection of light during transport of the film. The shutter comprises a rotating arcuate member rotatable to interrupt a light path of the projector, and an eccentric spindle rotatable with the shutter member and adapted to engage the film to `trigger` transport in synchronization with shuttering.The projector also includes a unique film guide construction for self-threading of the projector, a co-axial film reel mounting and driving mechanism, and a film storage cartridge which includes a mechanism for retaining the free end of the film strip in proper orientation for self-threading of the projector.

Abstract: A hydraulic system responsive to movement of a shift lever energizes selected pairs of drive engaging devices in a vehicle transmission by applying a gradual rise in pressure to the selected speed drive engaging device and by applying a delayed and a lesser gradual pressure rise to a selected directional drive engaging device. The circuit neutralizes the transmission by blocking fluid pressure from at least one of the devices if the vehicle engine is started with the shift lever at a position other than neutral and also neutralizes the transmission when the vehicle brakes are applied while still maintaining full fluid pressure to other vehicle components. These functions are accomplished by a combination of a pair of selector valves, a pressure modulation valve assembly and a greatly simplified and compact spool differential check and safety valve.

Abstract: A fluid reservoir and filter combination includes a reservoir made of upper and lower sections with a filter support assembly comprising a base mounted in the lower section and a hold-down assembly mounted in the upper section. The filter assembly includes misalignment accommodating means comprising a particular configuration of the hold-down assembly including an elongated sleeve for extending into a filter element and a collar slidably mounted on the sleeve and biased toward the filter element for sealingly engaging the end of the filter element. The dimensions of the collar and sleeve element are such as to accommodate lateral misalignment of a filter element supported on the base member with respect to the hold-down assembly. Longitudinal misalignment is accommodated by means of the length of the sleeve member.

Abstract: A method of making opthalmic lenses is disclosed comprising the steps of forming at least a major body portion of a first lens body from a transparent plastic resinous material having an index of refraction greater than that of crown glass, rough shaping the first lens body portion to provide the lens configuration, selecting first and second thin plano glass shields having the respective shapes to form the different sides of the main body portion, shaping the first lens body portion between the shields by means of pressure and bonding each of the shields to the respective sides of the first lens portion.

Abstract: The invention is concerned with an improved creep resistant sealing arrangement for a bell jar which is used in vacuum work. The bell jar generally consists of a closed top cylindrical container having an open bottom defining a planar rim. The rim generally seats against a flat surface with a gasket between the rim and the surface. A vacuum source communicates with the interior of the bell jar. The sealing arrangement of the present invention comprises a unitary resilient elastomeric ring having a generally J-shaped cross-section, an outer leg of which fits against the outside of the bell jar, an inner leg of which fits against the inside of the bell jar and a cross member of which fits against the rim of the bell jar. Also part of the sealing arrangement is means for fastening the outer leg radially against the outside of the bell jar.

Abstract: A one-piece cutting edge and tooth adapter assembly for operative attachment to the earth working surface of an earth moving device. The one-piece cutting edge and tooth adapter assemblage is provided in discretely removable modules having either singular or plural adapter means. A tooth is provided for readily replaceable mating connection to each adapter means. Upon wear of a particular earth working tooth or a particular cutting edge and an adapter module, only the particular worn component need be replaced and this is accomplished without disturbance of the other components.

Abstract: A device for controlling the rotational speed of a friction welder as a function of the combined length of the pair of parts to be welded, within predetermined tolerances, so as to produce welded pieces of uniform length in spite of minor variations in the lengths of the parts. Logic and sequencing circuitry specially adapted to carry out this function at minimum cost is also described.

Abstract: Method of making an annular sand core portion by shaping sand and binder in an annular mold with an inflatable bladder. The bladder is inflatable and expandable to form and press sand core material between itself and the mold body while exerting uniform compressive force over the total surface area of the core material thereby forming a portion of a hollow core of precise external dimension and uniform overall strength.

Abstract: Retaining means for an earthworking tip member including a wire spring member bonded into a washer shaped member of resilient material. The means also include a partially cylindrical partially flat surfaced retaining bar member having grooves for receiving portions of the wire spring member within the open central portion of the washer shaped resilient member. The resilient member is received within a recessed portion of an adapter or shank upon which the earthworking tip member is retained. Upon engagement with the grooves in the bar member, the wire spring means and the resilient member tend to rotate the retaining bar to lock the bar member in place from firm retention of the tip member during use. The retention means is also selectively releasable when desired for removal thereof and release of the tip member.