Showing papers on "Reducer published in 1970"

Valve control system

Abstract: Valve control apparatus including a housing positionable over an underground valve and opening vertically in alignment with the valve control handle. A vertically elongated guide pipe is engaged with the housing through a reducer for the guided introduction of a removable elongated control rod. An adapter is mounted within the housing below the reducer and in engagement with the valve control handle. The adapter includes a polygonal socket which receives the lower end of the control rod, guided therein by an upwardly directed concave mouth on the adapter.

Method for making pipe reducers

Abstract: A method is described for making plastic pipe reducers, such as, for example, for large diameter polyvinyl chloride irrigation pipe employing the shape memory of extruded plastic irrigation pipe to full advantage. An appropriate length of extruded plastic pipe having a diameter approximately that of the smaller reducer diameter is cut from a length of extruded plastic pipe. A sufficient length of the cut piece to form the larger diameter end and the transition to the smaller diameter end is heated to the softening temperature of the thermoplastic material. Longitudinally extending fingers are forced radially outwardly to expand the length of pipe polygonally into the transition portion, and the pipe is cooled in its expanded condition. A circular mold having an outside diameter the same as the relatively larger inside diameter of the reducer is inserted in the expanded end, and that portion adjacent the old is heated to the softening temperature of the plastic so that the shaped memory of the plastic shrinks the material onto the mold. The mold is removed after the plastic material is cooled. A similar molding technique is employed for the smaller diameter end of the reducer, either before or after the larger end is formed.

Series of gear speed reducers

Abstract: The invention relates to a series of n gear speed reducers with at least n unequal center distances in increasing order, the absolute values of the last center distance of each speed reducer in the series, i.e. of the specific center distances, form an improper geometric progression of which the successive values of the ratio form a geometric progression.

Elevatable scraper drive for circular gravity thickener

Abstract: The rotating underwater structure of the gravity thickener comprises two scraper arms and a central vertical cage. The cage is secured above water to a gear housing which is slidable on a rigid vertical cylindrical column. Opposite tension rods are connected to the gear reducer housing and an equalizing mechanism carried by and extending horizontally from the upper end of the column and prevent rotation of the gear reducer. The entire structure and reducer is raised and lowered hydraulically as required.

An evaluation of the static charge reducer for reducing electrostatic hazards in the handling of hydrocarbon fuels

Abstract: : The report describes the results of an experimental evaluation of the Static Charge Reducer. The Static Charge Reducer is a device which automatically neutralizes an electrically charged fuel as the fuel flows through it. The tests conducted confirmed the claims that the Static Charge Reducer would reduce the charge density of a flowing hydrocarbon fuel to below 30 microcoulombs per cubic meter. The tests also indicate that two corrosion inhibitor fuel additives significantly affect the electrical conductivity of fuel containing the ASA-3 antistatic additive.

Ski lift bullwheel

Abstract: Ski lift cable bullwheel characterized by a hub containing a planetary gear speed reducer. A brake drum for arresting motion of the bullwheel is affixed to the hub. In the illustrated and preferred arrangement of parts, the planetary gearing is disposed in the upper portion of the hub and the brake drum is disposed adjacent the lower end thereof. A conventional speed reducer is preferably employed between the planetary speed reducer and the drive motor to effect speed reduction and torque gain to the bullwheel in two discrete stages.

Pressure reducer for autogenous welding

Abstract: Membrane controls spring-loaded valve. Filter between gas entry and exit is of porous sintered metal and forms chamber between entry and valve seating.