Abstract:
A trough reflector for solar energy collection is constructed from transverse ribs (10) which support a reflective surface (12). Side edge support rails (20), which are mounted on the ends of the ribs, support the linear edges (14) of the reflective surface. The edge support rails (20) have a channel-like construction with an inner flange member (22) which is in contact with the top of the reflective surface, and a lip member (24) extending from an outer flange member (23). The edge region of the reflective surface (12) rests on the lip member (24) with the edge (14) of the reflective surface in contact with the outer flange member (23). Tightening the bolts (30) which secure the edge support rails (20) to the ends of the ribs (10) applies a turning moment to the edge regions of the reflective surface, to ensure that the entire reflective surface is parabolic. The preferred construction of the trough reflector uses flexible, resilient ribs (10) which initially have an arcuate profile. The arcuate profile is converted into a parabolic profile by the application of a force to the ends of the ribs. A respective chordal strap (34) is used to hold each rib in its parabolic profile. The trough reflector is preferably mounted on rotatable hoop members (42, 43) to form a solar energy concentrator. Rotation of the hoop members is effected by a combination of pinch bearings (57) and pinch rollers (50), which are driven by a motor (56). Preferably, a microprocessor is used to control of the activation of the motor.
Abstract:
An aircraft wing box comprises a pair of half ribs (18, 20) joined to form a rib extending from an upper wing skin (12) to a lower wing skin (10). Each half rib (18) comprises a base (19) and a plurality of projections (4) that extend away from the base (19), the projections (4) defining a series of troughs (2a) and peaks (4a). Respective projections of one half rib (18) overlap with respective projections of the other half rib (20) thereby defining overlapping portions (3), the half ribs (18, 20) being joined in the regions of the overlapping portions (3). There may be projections (4) shaped such that the overlapping portion (3b) defined by the two projections is separated from the neutral axis N of the rib (18, 20). The half ribs may be joined in the regions of the overlapping portions (3) by means of a fixing arrangement (7) that enables the position of joining of the half ribs to be adapted during initial assembly of the half-ribs (18, 20) to accommodate relative movement of the half ribs in a direction substantially parallel to the plane of one of the half ribs. The half ribs (18, 20) may be formed by deforming extruded metal sections. During assembly, in-wing systems (32) may be inserted before joining two wing-box halves.
Abstract:
A process for manufacturing a can with a polygonal cross section and a can with a polygonal cross section, the process comprising the steps of: milling the cylindrical lateral wall of a tubular body (10), providing said wall with a plurality of circumferential ribs (20), which are continuous and axially spaced from each other and defined by a certain degree of radial plastic deformation of the respective circumferential region of the cylindrical lateral wall of the tubular body (10); expanding the formed tubular body (10), deforming it, in order to define longitudinal edges (12) in whose region the circumferential ribs (20) are eliminated; and double-seaming a bottom and an upper wall of the can to the tubular body (10). This process defines a can having any polygonal cross section and circumferential ribs (20) on the lateral wall thereof, between the longitudinal edges (12).
Abstract:
A parabolic trough solar collector system has a parabolic reflector used with an independently supported collector tube. The parabolic reflector has a reflective surface formed on a reflective surface support structure, supported by a circular support beam. This assembly rests on a plurality of support and drive rollers supported by a roller support arm, supported by a roller support column. The parabolic reflector assembly rotates against the rollers along a single axis to maintain a focus line of the parabolic reflector surface at the same location as the center of the circle described by the outer edge of the circular support beam. Located at this same focus line is the independently supported collector tube not attached to the parabolic trough reflector. The collector tube is supported on pipe roller hangers, which in turn are supported by a wire catenary system connected to support towers which straddle the parabolic reflector.
Abstract:
A tampon applicator barrel including a cardboard tube having a first end and a second end and at least one gripping structure defined from the cardboard tube proximate the second end is provided. The cardboard tube has a wall thickness of between about 0.015 and about 0.020 inches, while the gripping structure has a height of upto about 0.035 inches.
Abstract:
A parabolic trough solar collector system has a parabolic reflector used with an independently supported collector tube. The parabolic reflector has a reflective surface formed on a reflective surface support structure, supported by a circular support beam. This assembly rests on a plurality of support and drive rollers supported by a roller support arm, supported by a roller support column. The parabolic reflector assembly rotates against the rollers along a single axis to maintain a focus line of the parabolic reflector surface at the same location as the center of the circle described by the outer edge of the circular support beam. Located at this same focus line is the independently supported collector tube not attached to the parabolic trough reflector. The collector tube is supported on pipe roller hangers, which in turn are supported by a wire catenary system connected to support towers which straddle the parabolic reflector.
Abstract:
Die Erfindung betrifft einen Kolben (10) für eine Kolben-Zylinder-Anordnung, insbesondere einen Stoβdämpferkolben, mit: einem Kolbenkörper (11), der eine Umfangsfläche (13) aufweist; einer Dichtmanschette (12), die eine äuβere Umfangsflache (15), eine innere Umfangsfläche (16), eine erste Randfläche (17) und eine erste Dichtlippe (19) aufweist und die um die Umfangsfläche (13) des Kolbenkörpers herum verläuft und in axialer Richtung wenigstens einen Teil der Umfangsflache bedeckt, wobei: die erste Randfläche an einem ersten Ende der Dichtmanschette die beiden Umfangsflächen miteinander verbindet; die erste Dichtlippe durch die erste Randfläche und die äuβere Umfangsfläche begrenzt wird; und die erste Dichtlippe in Umfangsrichtung gleichformig ausgebildet ist.
Abstract:
Methods of forming polarized panes for variable transmission windows are disclosed. The polarized panes are formed from transparent substrates that are brushed with a brushing pattern that varies continuously in a select direction over each of one or more periods. A layer of polarizable material such as POLARCOAT material can be deposited on and responds to the brushed surface by forming a polarization pattern that substantially matches the brushing pattern and thus also includes one or more periods.
Abstract:
The present invention relates to methods for securing a distributor plate to a backing plate of a chromatography column without the need for releasable fixing means as screws or bolts. The invention also relates to chromatographic columns utilizing such methods. The method employs a negative pressure or vacuum that is generated internally within the column to affix the distributor to the backing plate.
Abstract:
An aircraft wing box comprises a pair of half ribs (18, 20) joined to form a rib extending from an upper wing skin (12) to a lower wing skin (10). Each half rib (18) comprises a base (19) and a plurality of projections (4) that extend away from the base (19), the projections (4) defining a series of troughs (2a) and peaks (4a). Respective projections of one half rib (18) overlap with respective projections of the other half rib (20) thereby defining overlapping portions (3), the half ribs (18, 20) being joined in the regions of the overlapping portions (3). There may be projections (4) shaped such that the overlapping portion (3b) defined by the two projections is separated from the neutral axis N of the rib (18, 20). The half ribs may be joined in the regions of the overlapping portions (3) by means of a fixing arrangement (7) that enables the position of joining of the half ribs to be adapted during initial assembly of the half-ribs (18, 20) to accommodate relative movement of the half ribs in a direction substantially parallel to the plane of one of the half ribs. The half ribs (18, 20) may be formed by deforming extruded metal sections. During assembly, in-wing systems (32) may be inserted before joining two wing-box halves.