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| Number | Title | Issue Date |
| 4464935 | Shaft vibration evaluation A shaft vibration evaluator employs measured displacement of a shaft in the vicinity of a bearing together with known or measured shaft eccentricity to calculate the dynamic bearing load so that damaging loads can be avoided. Shaft vibration or motion is ... | 08/14/1984 |
| 4458234 | On-board apparatus for monitoring the condition of shock absorbers A vehicle equipped with a spring and shock absorber suspension has a piezoelectric wafer interposed between the spring and a part of the vehicle in such manner as to cause the wafer to be subjected to a compressive or decompressive force in response to re... | 07/03/1984 |
| 4450326 | Anti-theft vibration detector switch and system In a preferred embodiment, a steel ball having a surface coating of gold is magnetically held against each of negative and positive electrical switch contacts within a fenced-in space substantially filled with silicone fluid, the electrical switch contact... | 05/22/1984 |
| 4448077 | Vibration diagnosis method for rotary machine A vibration diagnosis method for a rotary machine is disclosed. The presence or absence of a self-excited vibration is determined by checking if a rotating speed is in a rotating speed range which allows the occurrence of the self-excited vibration, if an... | 05/15/1984 |
| 4441103 | Unusual vibration transducer apparatus in machine tools By mounting unusual vibration transducer apparatus consisting of a piezo-electric vibration detecting member, a pre-amplifier including a gain adjust knob, a comparator including level adjust knob, a monostable multivibrator including a pulse width adjust... | 04/03/1984 |
| 4429578 | Acoustical defect detection system The vibration of a moving device which has repetitive movements, for instance a rotary compressor, are sensed at the outer case and analyzed in real time in both the time and frequency plane. For the time analysis the envelope of the signal is generated; ... | 02/07/1984 |
| 4426641 | Method and apparatus for monitoring the shaft vibration of a rotary machine From the viewpoint of the preventive maintenance operation of a rotary machine, it is a very important subject to monitor the shaft vibration of the rotary machine and grasp the operating state of the machine. This invention relates to input processings i... | 01/17/1984 |
| 4399548 | Compressor surge counter A surge counter for a rotating compressor is provided which detects surging by monitoring the vibration signal from an accelerometer mounted on the shaft bearing of the compressor. The circuit detects a rapid increase in the amplitude envelope of the vibr... | 08/16/1983 |
| 4392214 | Sound-monitoring device for an industrial installation Sound monitoring device for an industrial installation to detect possible impacts of stray bodies including at least one set of two sound detectors arranged in contact with the wall of the installation or in its vicinity, and a measuring and alarm circuit... | 07/05/1983 |
| 4381504 | Switch and alarm system responsive to sudden movement, angular tilt and vibration A switch and alarm system capable of detecting any one or more of the conditions of angular tilt, vibration or sudden movement includes a conically shaped movable contact suspended within an aperture in a fixed contact. The cone forming the movable contac... | 04/26/1983 |
| 4369398 | Method and apparatus for monitoring vibrating equipment An apparatus and method for detecting overstroke, understroke and/or overspeed, underspeed conditions in vibratory equipment includes a vibratory member mounted on the equipment to vibrate therewith and to operate solid-state switches over a large number ... | 01/18/1983 |
| 4366544 | Judging system for detecting failure of machine A system for detecting whether a machine is in the normal or abnormal state by comparing detected values of waveforms of signals such as vibration generated from the machine with a set value a plurality of times to indicate failure of the machine when the... | 12/28/1982 |
| 4359717 | Position-sensitive alarm system To increase the responsiveness of a vehicle alarm system to, for example, unauthorized entry through windows, jacking up for removal of parts or vehicle theft as well violent impact by another vehicle, at least one position sensitive sensor has its output... | 11/16/1982 |
| 4317368 | Acoustic emission warning system for a fiberglass member An apparatus is provided for use as an onboard monitor and warning system attached to a fiberglas boom to detect potentially hazardous loads by detecting and counting acoustic emissions produced in the boom by the breakage of glass fibers. The monitor and... | 03/02/1982 |
| 4317105 | Condition indicating device for wheeled vehicle shock absorbers According to the invention, an accelerometer (G) is attached on the spring suspension (U) of the wheel (H) in question and capable upon passing of the vehicle over road irregularities to emit a decaying A.C. signal (S) with information on the oscillations... | 02/23/1982 |
| 4295136 | Indicating apparatus, particularly for vibration analyzing equipment Apparatus for visually indicating to an operator of a vernier, for example, that he is approaching a desired set point. The apparatus additionally indicates when the exact set point has been reached. This is accomplished with the use of a display, prefera... | 10/13/1981 |
| 4237454 | System for monitoring bearings and other rotating equipment A self-powered monitor unit with a tuned mechanical resonator power unit and a radio transmitter is mounted on every piece of rotating equipment being monitored, such as machinery with ball bearings. Bearing vibrations are sensed and the generation of a d... | 12/02/1980 |
| 4233600 | Method and system for detecting plate clashing in disc refiners A refiner plate clash detection system and method for plate clash detection is provided herein. The system includes a receiver for a first signal having a significant increase in level at at least one distinct predetermined frequency related to the clash ... | 11/11/1980 |
| 4220995 | Apparatus for detecting tip damages of a milling cutter An apparatus for detecting tip damages of a milling cutter comprising a motor for driving the milling cutter, a vibration detector mounted on the milling cutter, a vibration increase calculating device connected with the vibration detector for calculating... | 09/02/1980 |
| 4213114 | Vibration monitoring system for an aircraft engine A monitoring system for detecting and indicating typical operating conditions, particularly vibration of an aircraft engine, wherein at least two measuring feelers such as accelerometers are exposed to the same conditions, the output signals from said fee... | 07/15/1980 |
| 4209779 | Method of monitoring equipment and system for carrying out the method Method of monitoring equipment wherein a measured value signal in the form of an electrical a-c signal is fed to the measuring channel of an electric circuit and a mean value output signal is formed by the electronic circuit in accordance with the amplitu... | 06/24/1980 |
| 4191869 | Vibration detector device A cylindrical movable member is forcedly fitted into two spaced annular leaf springs and disposed within a main detector body on its longitudinal axis with the lower end of the movable member put in point contact with the bottom of the main body. The leaf... | 03/04/1980 |
| 4184205 | Data acquisition system A data acquisition system utilizing a microcomputer and incorporating a plurality of monitors each adapted to produce an electrical signal indicative of a physical condition of apparatus to be monitored. The electrical signals are fed via multiplexing equ... | 01/15/1980 |
| 4133207 | Device for detecting knot-like thick places in travelling textile threads Novel device for detecting knot-like thick places in travelling textile threads, comprising a plate-shaped or rectangular vibratory member which is fixed at one end and has a straight edge at its other end. A plate-shaped piezoelectrical transducer elemen... | 01/09/1979 |
| 4080598 | Safety circuit for electric device A protective device for coin operated vending and game machines prevents machine operation and sounds an alarm for a predetermined time after either the machine is struck or power to the machine is interrupted.... | 03/21/1978 |
| 3979739 | Apparatus for the detection of vibration in rotating machinery A transducer generates a signal whose amplitude corresponds to the vibration amplitude of a machine under test. The output of the transducer is passed to a comparator which gives a logic 1 output when the transducer output signal lies outside an acceptabl... | 09/07/1976 |
| 3937152 | Oscillation sensitive vehicle motor control In a motor-driven rail vehicle, an arrangement is provided for sensing oscillations in the drive system occurring in a predetermined frequency range, and to reduce the torque of the motor if the oscillation amplitude sensed thereby exceeds a predetermined... | 02/10/1976 |
