4,307,794 43.40.Tm APPARATUS FOR ABSORBING

MECHANICAL ENERGY, IN PARTICULAR ENERGY OF VERY STRONG SHOCKS

Jeremi Maciejewski, assignor to Institut Chemii Przemyslowej 29 December 1981 (Class 188/268); filed in Poland 17 April 1978

This shock absorber, intended for use on rail vehicles and the like, consists of a fixed cylindrical tube, into which are inserted in telescopic fashion one or more cylindrical tubes and a plunger. The cylindrical tubes are closed at the ends that face the fixed end of the outermost tube and are

filled with a pressurized viscoelastic material. Use of such a material does away with the need for separate return springs and provides the desired resilience and energy dissipation.--EEU

4,300,135 43.40.Vn SEISMIC ALARM SYSTEM

Lawrence D. Korn, Southfield, Michigan 48075; Erik D. Good- man, E. Lansing, Michigan 48823; and Charles R. MacCluer, Laingsburg, Michigan 48848

10 November 1981 (Class 340/690); filed 21 June 1979

The Pwave from an earthquake is small and arrives before the destruc- tive S and L waves. This invention describes an inexpensive and sensitive seismic alarm which when fixed to the wall of a house may allow the occu- pants to leave the house before destructive tremors arrive. Two capacitor plates, one fixed to the wall and the other suspended by an inertial mass- spring system set the frequency of an oscillator. The oscillator output is fed to a phase lock loop discriminator and the error signal from this circuit, after signal conditioning, triggers the alarm.mTGW

4,307,387 43.40.Vn VIBRATION-RESPONSIVE INTRUDER ALARM SYSTEM

Roy Baxendale, assignors to Elliott Brothers (London) Limited 22 December 1981 (Class 340/566); filed in England 23 February

1979

In this system, intended for use on fences and similar structures, sig- nals obtained from vibration tranducers are bandpass filtered in two bands and rectified. Means are provided for electively applying one of the rectified components to an integrator circuit during periods when the other rectified signal component exceeds a predetermined threshold value. An alarm is given when the output of the integrator exceeds a given level. This signal processing means is claimed to be useful for avoiding spurious alarms due to wind-induced motions.--EEU

4,321,427 43.66.St APPARATUS AND METHOD FOR AUDIOMETRIC ASSESSMENT

Sadanand Singh, Houston, Texas 77030 23 March 1982 (Class 179/1 N); filed 18 September 1979

A complex signal is filtered to provide (a) a fundamental in the range 125-250 Hz; (b) a harmonically related first formant tone in the range 250- 1250 Hz; and (c) a harmonically related second formant tone in the range 875-2500 Hz. The combined signal is adjustable in level, as are the compon- ents. It is stated that the device can produce sounds throughout the range of complexity between pure-tone signals and speech sounds. Method claims are directed to the use of the device for assessing a person's hearing skills.-- SFL

4,311,206 43.66.Ts HEARING-AID EAR MOLD WITH IMPROVED DISCRIMINATION

Rubein V. Johnson, Muskogee, Oklahoma 74401 19 January 1982 (Class 181/135); filed 4 October 1979

The patent describes a hollowed-out earmold with an adjustable iner- tance at the tip. This tunes the cavity resonance to a desired frequency at

4562•44 / 54• 4 44 6• 6 which increased response is obtained. The single claim is limited, possibly because the general arrangement has been known and used for a long time.--SFL

4,314,553 43.66.Vt EARPLUG AND EARPLUG SET

Roland Westerdal, assignor to Bilsom AB, Sweden 9 February 1982 {Class 128/152); filed 8 August 1979

An carplug is shown that has a stem 12 for case of insertion. The tip portion 14 is approximately conical in shape and its skirt is spaced from the

. 20 •1t stem portion so that it can compress to fit a range of ear sizes. Two of the tips may be joined by a cord.--SFL

4,316,290 43.66.Vt EAR MUFF ACCESSORY FOR SAFETY HARD HAT

Edward N. Montesi, assignor to Norton Company 23 February 1982 (Class 2/423); filed 18 July 1980

The patent describes a mechanical arrangement for mounting ear muffs on a safety helmet. A resilient arm, adjustable in position to permit a good fit of the ear muff on the ear, may also be rotated to place the earmuffs in a stored position on the sides of the helrnet.--SFL

4,319,081 43.70.Ny SOUND LEVEL MONITORING APPARATUS

Michael C. Martin and Ian R. Summers, assignors to National Research Development Corporation

9 March 1982 (Class 179/1 MN); filed in United Kingdom 13 September 1978

The device described is for the purpose of aiding a deaf person monitor the level of his speech. The output of a microphone, worn by or near the deaf person, is amplified and processed so that a visual indicator (e.g., an LED)

J. Acaust. Sac. Am. 72(3), Sept. 1982; 0001-4966/82/091095-02500.80; ¸ 1982 Acaust. Sac. Am.; Patent Reviews 1095 1095

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