4,733,379

43.40.Ph LINE ARRAY TRANSDUCER ASSEMBLY

Robert A. Lapetina, Gordon L. Snow, and David P. Baird, assignors to Edo Corporation

22 March 1988 {Class 367/20); filed 17 March 1986

Spaced-apart piezoelectric elements are arranged generally in a line assembly having selected characteristics.mSAC

4,733,380

43.40.Ph APPARATUS AND METHOD FOR

ACOUSTICALLY INVESTIGATING A CASING SET IN A BOREHOLE

R. Mark Havira, assignor to Schlumberger Technology Corporation 22 March 1988 {Class 367/35}; filed 24 December 1984

This patent discloses a method and apparatus using an electronically scanning transducer inside the casing of a borehole in the earth to investi- gate the physical characteristics of the casing.mSAC

4,699,180

43.40.Tm VIBRATION DAMPING MOUNTING FOR A

WEAVING MACHINE

Ammann Stefan and Herzig Marcel, assignors to Sulzer Brothers, Ltd.

13 October 1987 {Class 139/1 R}; filed in Switzerland 24 September 1985

This patent relates to a vibration damping mounting comprising an assembly of horizontal layers of a soft plastic material interleaved with harder stiffening plates to provide a vertical spring rate at least one order of

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--•-=• • I '-'• I'•, i ;

pipe. It would appear that such longitudinal slits would weaken the pipe member, and frictional damping between adjacent slit walls would occur only if suitable, forced contact could be maintained between them under severe service conditions of heat and stress.--CHA

4,714,229

43.40.Tm ANTI-VIBRATORY SUPPORT DEVICE FOR A PIPE WHOSE THICKNESS IS SMALL RELATIVE TO THE DIAMETER

Christian Force and Alain Lescure, assignors to Novatome 22 December 1987 (Class 248/610); filed in France 27 April 1984

This patent describes an antivibratory support for a pipe having a wall thickness small relative to its diameter and a known operating temperature evaluated. This device comprises an articulated collar of at least two rigid annular sectors that define a gap around the pipe, to position a plurality of

40

46 •, !

45

12 10 il

6

parallelepedic damping pads of knitted stainless steel wire, that are pressed against the pipe by means of a junction, connecting the two ends of the collar with a bolt, acting through spring washers to apply a desired radial com- pression against the pads.--CHA

12

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magnitude greater than the horizontal spring rate. The purpose is to sup- port a weaving machine, and damp its horizontal vibration, while providing sufficient vertical stiffness to maintain accurate alignment.--CHA

4,699,243

43.40.Tm VIBRATION ISOLATING PIPE

Shigenaga Enoki, assignor to Honda Giken Kogyo Kabushiki Kaisha 13 October 1987 (Class 181/207); filed in Japan 28 January 1985

A vibration isolating pipe is described wherein slits are cut along the axis of the pipe and the friction of the slit surfaces absorb vibrations. Appli- cations are made to a motorcycle body frame and a motorcycle exhaust

4,714,449

43.40.Tm APPARATUS FOR REDUCING VEHICLE DRIVE TRAIN VIBRATIONS

Guenter Woerner, Ernst Tscheplak and Franz Moser, assignors to Daimler-Benz Aktiengesellschaft

22 December 1987 {Class 464/68); filed in Germany 4 June 1985

This patent describes a means for reducing the transmission of vibra- tion from an engine to a transmission line. It comprises a divided fly wheel with elements that can rotate relative to each other, between which are at least two pairs of opposing, spring loaded, friction surfaces with clutch engagement, at least one pair of which supports a maximum torque less than the maximum torque delivered by the engine. In parallel combination, the clutch will support the maximum steady torque delivered by the engine, thereby allowing some momentary angular movement between the ele- ments such that movement between at least one pair of slip surfaces will extract vibrational energy from such oscillating components of the torque as may be delivered by the engine during start-up, idling, or gear changes-- CHA

797 J. Acoust. Soc. Am. 84(2), Aug. 1988; 0001-4966/88/080797-01500.80; ¸ 1988 Acoust. Soc. Am.; Patent Reviews 797

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