Showing papers on "Frustum published in 1972"

Lawn vacuum cleaning and packing apparatus

Abstract: A frustum-shaped housing has an opening at its smaller end connected to a fan to draw air through the housing, an intake disposed tangentially to the inside slating wall of the frustum to pass air and debris into the housing, and an opening in its larger end connected to a non-porous bag into which the debris is packed. The opening for the fan at the smaller end of the frustum is covered with a screen, and a wiper on the inside surface of the screen is rotated to dislodge from the screen particles that did not flow directly toward the larger end of the frustum. Flails near the larger end of the frustum are rotated to strike the debris and force it outwardly from a circular air stream within the housing into the attached bag.

Magnetic type transmission arrangement

Abstract: A magnetic type transmission wherein a first shaft drives a coaxial second shaft at a greatly reduced speed through the intermediary of a flexible disk which is secured to the second shaft and has at one of its sides an annular surface located opposite the conical surface of a rigid conical frustum. The maximum diameter of the conical surface is less that the outer diameter of the annular surface in undeformed condition of the disk. Successive increments of the annular surface are caused to contact and to travel along the conical surface (whereby the disk rotates with the second shaft relative to the rigid frustum and the first shaft) in response to travel of at least one roller along the other side of the disk opposite the annular surface. The roller is mounted on and orbits about the axis of the first shaft. Alternatively, the conical frustum can attract the annular surface toward its conical surface; the roller is then replaced with one or more magnets which are driven by the first shaft and attract the adjacent portions of the disk so that at least one series of successive increments of the annular surface again travel along the conical surface and the disk rotates with the second shaft at a speed which is a function of the difference between the circumferential lengths of the annular and conical surfaces and the vertex angle of the conical surface.

Mixing, homogenizing and emulsifying apparatus

Abstract: An apparatus for mixing, homogenizing and emulsifying liquid and liquid/solid mixtures comprises a plurality of individual chambers connected in series. Each chamber has the shape of a double frustum and adjacent chambers are connected to each other by supply and discharge channels which enter the individual chambers tangentially.

Process for controlling water and gas coning

Abstract: This specification discloses a method for controlling the ratio of fluids produced from a subsurface formation having a hydrocarbon-bearing portion and another fluid-bearing portion. A well penetrates the formation and communicates with it through an open production interval. A barrier which is shaped as a hollow frustum is formed in the hydrocarbon-bearing portion of the formation about the well with the small portion of the frustum being formed such that it closes about the well in close proximity to the interface formed between the hydrocarbon-bearing portion and the other fluid-bearing portion of the formation. The small portion of the frustum may extend into the other fluid-bearing portion of the formation. Hydrocarbons are produced from the formation and the barrier reduces the flow of fluid from the other fluid-bearing portion to the well.

Analysis of flight test transition and turbulent heating data. Part 1: Boundary layer transition results

Abstract: The objective of the study was to provide a detailed post flight evaluation of ballistic vehicle flight test boundary layer transition data. A total of fifty-five vehicles were selected for analysis. These vehicles were chosen from a data sampling of roughly two hundred flights and the criteria for vehicle selection is delineated herein. The results of the analysis indicate that frustum transition of re-entry vehicles appears to be nose tip dominated. Frustum related parameters and materials apparently have a second order effect on transition. This implies that local viscous parameters on the frustum should not correlate flight test transition data, and in fact they do not. Specific parameters relative to the nose tip have been identified as the apparent dominant factors that characterize the transition phenomena and a correlation of flight test data is presented.