Showing papers on "Bend radius published in 1978"
Patent•
18 May 1978
TL;DR: In this article, the authors describe a set of troughs for the insertion of optical fibres in one or more turns, which can be circular or oval and have openings or notches distributed over the inner and/or outer periphery.
Abstract: The troughs (6) in the sleeve (1) are used for the insertion of optical fibres and are arranged in one or more turns. The troughs can be circular or oval. One of the troughs has openings or notches (8) distributed over the inner and/or outer periphery. These openings are used to guide the optical fibres from the cables to the splicing or plugging devices. The radius of the trough is greater than the permissible bending radius of the optical fibres. If the bending radii of the optical fibres is too small, there is a risk that light will escape. That means increased damping of the transmitted signal. The permissible radius is dependent on the numerical aperture.
9 citations
TL;DR: In this article, the authors investigated the relationship between the elliptical and circular bends and proposed an empirical formula to predict the pressure drop in two-phase and single-phase flows, respectively.
9 citations
Patent•
29 Jun 1978
TL;DR: In this article, a rotatable bending die whose radius of the pressure die side peripheral face has been specified and a pressure die movable in the tangential direction was used to bend a pipe while reducing its overall circumferential length.
Abstract: PURPOSE: To enable a thin-walled pipe for automotive exhaust pipes, etc. to be bent to a small radius of curvature without creasing, flattening or the like by using a rotatable bending die whose radius of the pressure die side peripheral face has been specified and a pressure die movable in the tangential direction thereby bending the pipe while reducing its overall circumferential length. CONSTITUTION: In bending a pipe 3 by using a pressure die 19 movable in the tangential direction and a rotatable bending die 11, the pressure die 19 side peripheral face of the pipe 3 is maintained nearly the same as the radius of the pipe 3 and the bending die 11 side peripheral surface is deformed to the shape having two peripheral faces of a radius larger than the radius of the pipe 3 (e.g., 1.12 times the radius of the pipe), whereby bending is accomplished while the overall circumferential length of the pipe is being reduced by several % (e.g. 5.3%). COPYRIGHT: (C)1980,JPO&Japio
7 citations
TL;DR: In this paper, the results of precise measurements of the driving point responses to a 200 ps input pulse of bent wire antennas of circular cross section mounted above a ground plane are presented, where the transmission and reflection coefficients (plotted as functions of frequency to 3 GHz) describing the propagation and reflection of monochromatic current waves on the wires are inferred from the measurements.
Abstract: The results of precise measurements of the driving point responses to a 200 ps input pulse of bent wire antennas of circular cross section mounted above a ground plane are presented. Transmission and reflection coefficients (plotted as functions of frequency to 3 GHz) describing the propagation and reflection of monochromatic current waves on the bent wires are inferred from the measurements. The results show that the current pulse reflected from a sharp bend ( r\theta \ll c\tau_{1} ), where r is the bend radius, \theta is the bend angle, c is the speed of light, and \tau_{1} is the pulse duration) is a compressed replica of the incident pulse, and that a current pulse propagating around a gradual bend ( r\theta \approx c\tau_{1} ) is continuously reflected from the whole length of the bend. The time domain measurements and the inferred frequency domain data give a clear physical picture of the mechanism of current propagation on bent-wire antennas.
5 citations
TL;DR: In this paper, a practical method was developed to predict the minimum bend radius and the amount of springback of aluminum alloy sheet and plate using analytical equations describing the mechanics of bending were used and were correlated with extensive 90-deg air bend test results of alloys 2024-T3, 3003-H14, 5052-H32, 5083-O, 6061-O.
Abstract: A practical method was developed to predict the minimum bend radius and the amount of springback of aluminum alloy sheet and plate. Analytical equations describing the mechanics of bending were used and were correlated with extensive 90-deg air bend test results of alloys 2024-T3, 3003-H14, 5052-H32, 5083-O, 6061-O, 6061-T4, 6061-T6, and 7475-T6. The method utilises the fracture strain obtained from a bend test or tension test in the minimum radius prediction and the mechanical properties obtained from a tension test in the springback prediction.
3 citations
Patent•
20 Apr 1978
TL;DR: In this paper, the authors propose to smoothly move probe unit by absorbing the stress loading to connecting part of signal cable and connector with the variation of bending radius of the signal cable which bends along the cable guide.
Abstract: PURPOSE:To smoothly move probe unit by absorbing the stress loading to connecting part of signal cable and connector with the variation of bending radius of signal cable which bends along the cable guide.
1 citations
Patent•
05 Dec 1978
TL;DR: In this paper, a bending back coil conductor is wound by bending back so as to make bending radius equal to nearly radius of toroidal coil after a coil is beforehand bent in a given bending radius.
Abstract: PURPOSE:To provide a constitution of improved workmanship of toroidal coil by winding a bending back coil conductor by bending back so as to make bending radius equal to nearly radius of toroidal coil after a coil conductor is beforehand bent in a given bending radius.
1 citations