VEHICLE SPEED RECORDING AND REPRODUCING DEVICES

• US 3,716,679 A
• Filed: 08/27/1970
• Issued: 02/13/1973
• Est. Priority Date: 08/27/1970
• Status: Expired due to Term

• Current Assignee: Dieter Georg Graesslin, Kurt Ropin, Siegbert Friedrich Hils
• Original Assignee: Dieter Georg Graesslin, Kurt Ropin, Siegbert Friedrich Hils
• Inventors: Graesslin, Dieter Georg, Hils, Siegbert Friedrich, Ropin, Kurt
• Primary Examiner(s): Hartary, Joseph W.
• Application Number:
  US05/067,404
• Time in Patent Office: 901 Days
• Field of Search: 346/33M,74M 179/1.2CF,1.2S 340/174.1A
• US Class Current: 360/73.13
• CPC Class Codes: G07C 5/12 in graphical form

Abstract

Recording devices with a recording medium which may be driven by the machine to be monitored and has a fixed frequency time track recorded on the medium. Also the recording medium can be driven at a fixed rate and the monitored device may drive a variable frequency generator which is magnetically coupled to the magnetic medium. Another modification provides mixing time reference signals and coupling the results to the magnetic medium.

Claims

1. Recording and reproducing devices wherein said recording device comprises:

an endless belt storage medium;

a pair of rollers supporting said storage medium;

a constant speed motor connected to one of said rollers to drive said belt storage medium at a constant speed;

a fixed standard frequency electronic oscillator;

a first recording head, a first winding mounted on said first recording head and connected to said fixed frequency electronic oscillator so that said first recording head records a constant frequency track on said storage medium;

a variable frequency oscillator;

a second recording head, a second winding mounted on said second recording head and connected to said variable frequency oscillator so that said second recording head records a variable frequency track on said storage medium;

a vehicle connected to said variable frequency oscillator to vary its frequency as a function of the speed of said vehicle, wherein said reproducing device comprises;

a pair of reels over which said belt storage medium is received;

a first read head, a third winding mounted on said first read head and mounted to read the track on said medium produced by said first recording head as it passes over said pair of reels;

an electric motor connected to receive the output of said third winding on first read head and connected to one of said reels to drive said belt storage medium;

a second read head, a fourth winding mounted on said second read head and mounted to read the track on said medium produced by said second recording head as it passes over said pair of reels; and

a reproducer means connected to said fourth winding on said second read head to produce a record output indicative of the speed of said vehicle as a function of time.