4,407,397 4,409,840

43.40.Tm SHOCK ABSORBER WITH PRESSURE- RELIEF MECHANISM

Naoto Fukushima, Kunihiko Hidalta, and Kazuroh Iwata, assignors to Nissan Motor Company

4 October 1983 (Class 188/282); filed in Japan 16 October 1980 .

This automotive-type-shock absorber makes use of an essentially hol- low piston, the space within which communicates with the spaces in the cylinder via narrow passages that are tangential, so that flow entering them tends to form a vortex in the hollow space. A resilient closure element restricts the flow at low fluid pressures, but opens at high pressures, thus preventing the absorber from producing excessive retarding forces.--EEU

43.40.Vn VIBRATING VANE PRESSURE GAUGE

Griffith T. Roberts, assignor to National Research Development Cor- poration

18 October 1983 (Class 73/704); filed in the United Kingdom 30 March 1981

A metal vane, mounted at the end of a cantilever, is made to vibrate (by means of an electromagnetic coil) within an enclosure that is only slightly larger than the volume swept by the vane and which communicates with the body of gas or vapor for which the pressure is to be measured. The rate of decay of the vane's vibration is sensed by essentially capacitative means to provide a measure of the gas pressure.--EEU

4,408,495

43.40.Vn FIBER OPTIC SYSTEM FOR MEASURING MECHANICAL MOTION OR VIBRATION OF A BODY

Robert D. Couch and Bruce N. Lenderking, assignors to Westing- house Electric Corporation

11 October 1983 (Class 73/655); filed 2 October 1981

This system employs a fiber-optic waveguide that is formed into a coil, or bent into a sinuous shape, so that the bend radius or critical angle for internally reflected light directed through the waveguide is exceeded. The system is so arranged that mechanical forces acting on it (or motions of part of it) change the bend radii and thus the optical "bending losses" in the waveguide. This change in the bending losses is used to generate a signal that is a function of the forces or motions.--EEU

4,408,533

43.40.Vn ACOUSTIC AMPLITUDE-THRESHOLD TARGET RANGING SYSTEM

Thomas E. Owen, Sidney A. Suhler, and Wendell R. Peters, assignors to the United States of America

11 October 1983 (Class 102/211); filed 27 July 1981

This patent describes a device to detect ground based targets through their seismic or acoustic radiation, and to explode a munition when the target is at the minimum distance from the explosive. It determines this by comparing the rate of change of sound level with the absolute magnitude of the sound level.•TGW

4,369,744

43.50.Gf LOW-NOISE LEVEL RECIPROCATING PISTON INTERNAL COMBUSTION ENGINE

Takao Kubozuka and Hirofumi Takei, Yokosuka, Japan 25 January 1983 (Class 123/198 E); filed in Japan 2 August 1979

Three alternative embodiments are described as superior in noise re- duction to prior art that comprised an oil chamber supported by rubber from the side of the block. The new embodiments use vibrationally damped

side panel assemblies, bolted and gasketed to heavy frame members as shown in the accompanying figure.•CHA .•

4,417,313

4,409,816

43.40.Vn KNOCK DETECTING APPARATUS FOR AN INTERNAL COMBUSTION ENGINE

Hiroaki Yamaguchi and Tadashi Hattori, assignors to Nippon Soken, Incorporated

18 October 1983 (Class 73/35); filed in Japan 19 September 1980

This is another one of a considerable number of recent Japanese pa- tents relating to vibration sensors to be mounted on engines in order to detect engine knock. Whereas most of these patents employ lightly damped resonant beam or plate elements for sensing vibrations at well-defined knocking frequencies, the present patent uses a relatively highly damped element (obtained by use of multilayer construction), intended to sense vi- brations over a wider frequency range.--EEU

43.50.Gf METHOD FOR OPTIMIZING THE DESIGN OF

A FINITE NOISE BARRIER

Herman Medwin, Pebble Beach, California 22 November 1983 (Class 364/524); filed 18 May 1981

The method uses "an extension of the Biot-Tolstoy rigorous closed form impulse solution for diffraction of an acoustic pressure pulse by an

z

1932 J. Acoust. Soc. Am. 75(6), June 1984; 0001-4966/84/061932-02500.80; ¸ 1984 Acoust. Soc. Am.; Patent Reviews 1932

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