Transmission of information

• US 3,930,224 A
• Filed: 04/23/1973
• Issued: 12/30/1975
• Est. Priority Date: 12/17/1971
• Status: Expired due to Term

• Current Assignee: Johannes G. Van Mill, Roland G. Whiteing
• Original Assignee: Johannes G. Van Mill, Roland G. Whiteing
• Inventors: Whiteing, Roland G., VAN Mill, Johannes G.
• Primary Examiner(s): Caldwell, John W.
• Assistant Examiner(s): Nowicki, Joseph E.
• Application Number:
  US05/353,655
• Time in Patent Office: 981 Days
• Field of Search: 340/58,60,258C 200/61.22,61.25 73/146.5,146.8 335/206,207,153 324/167,168 325/113
• US Class Current: 340/448
• CPC Class Codes: B60C 23/043 using transformer type signal transducers, e.g. rotary transformers
• CPC Class Codes: G01P 3/481 of pulse signals

Abstract

A warning device associated with a rotatable body comprising means on the rotatable body for creating a magnetic field, a receiving coil on a relatively stationary member arranged such that upon rotation of the rotatable body interaction with the magnetic field causes electrical pulses to be generated in the receiving coil and an electronic switching circuit operated by the pulses such that a warning is given upon occurrence of a predetermined condition, such as pressure of a vehicle wheel deviating outside a predetermined limit.

Claims

1. A warning device associated with a movable body comprising:

transmitter means mounted on said body to move therewith, said transmitter means including a single transmitter coil and a condition-responsive switch electrically interconnected with said coil whereby a circuit is completed through the coil dependent upon the position of the switch;

receiver means mounted on a stationary body adjacent said movable body, said receiver means including a single receiver coil and a magnetic field source, said source being capable of inducing a current in said transmitter coil when proximate said transmitter coil;

a magnetically operated switch connected in parallel with said transmitter coil and operated by said source as current is induced in said transmitter coil so as to produce a back E.M.F. which is inductively coupled by the transmitter coil to said receiver coil when the condition-responsive switch is positioned to prevent completion of said circuit through the transmitter coil and the condition-responsive switch; and

means joined to said receiver coil and responsive to a predetermined level of voltage induced on the receiver coil as a result of said back E.M.F. for providing a warning upon occurrence of a condition which changes the position of said condition-responsive switch to one preventing completion of said circuit.

2. A warning device as set forth in claim 1, wherein said movable body is rotatable.

3. A warning device as set forth in claim 1, wherein said magnetically operated switch is a normally-open reed switch.

4. A warning device as set forth in claim 1, wherein said condition-responsive switch and said magnetically operated switch each are connected in parallel with said transmitter coil.

5. A warning device as set forth in claim 4, wherein said magnetically operated switch is a normally-open reed switch and wherein said condition-operated switch is a normally closed switch which is opened on occurrence of the condition which changes the position of said condition-responsive switch.

6. A warning device as set forth in claim 1, wherein said means responsive to a predetermined level of voltage induced on the receiver coil includes a silicon-controlled rectifier biased by said induced voltage and display means connected to said silicon-controlled rectifier.