APPARATUS FOR CONVEYING INFORMATION FROM A MOVING OBJECT TO A STATIONARY OBJECT

• US 3,840,850 A
• Filed: 05/11/1972
• Issued: 10/08/1974
• Est. Priority Date: 12/17/1971
• Status: Expired due to Term

• Current Assignee: Johannes Godfried Antonius Van Mill, Roland Graham Whiteing
• Original Assignee: Johannes Godfried Antonius Van Mill, Roland Graham Whiteing
• Inventors: Whiteing, Roland Graham, VAN Mill, Johannes Godfried Antonius
• Primary Examiner(s): Caldwell, John W.
• Assistant Examiner(s): Nowicki, Joseph E.
• Application Number:
  US05/252,227
• Time in Patent Office: 880 Days
• Field of Search: 340/58,60 200/61.22,61.25 73/146.5,146.8 335/206,207,153 307/1R,258C 180/103 116/34R 310/67R,68R 325/113 324/167,168
• 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 or temperature 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 including first and second electrically interconnected coils located in spaced relationship;

a condition-responsive switch electrically interconnected with said coils whereby a circuit is completed through the coils dependent upon the position of the switch;

receiver means mounted on a stationary body adjacent said movable body, said receiver including a third coil located proximate the second coil when the first coil is located proximate a magnetic field source mounted on said stationary body, said source being capable of inducing a current in said first coil when proximate said first coil;

a magnetically operated switch connected in parallel with said first coil and operated by said source as current is induced in said first coil so as to produce a back E.M.F. which is inductively coupled by the second coil to said third coil when said condition-responsive switch is positioned to complete a circuit through said first and second coils; and

means joined to said third coil and responsive to the level of voltage induced on the third coil for providing a warning upon occurrence of a condition which changes the position of said condition-responsive switch.

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 first and second coils are connected in series with the condition-responsive switch.

4. A warning device as set forth in claim 1, wherein said magnetically operated switch is a normally open reed switch which is closed when the first coil is located proximate said source.

5. A warning device as set forth in claim 1, wherein said condition-responsive switch is responsive to pressure.

6. A warning device as set forth in claim 1, wherein said condition-responsive switch is responsive to temperature.

7. A device for detecting the movement of a movable body, comprising:

transmitter means mounted on said body to move therewith, said transmitter including first and second electrically interconnected coils located in spaced relationship;

receiver means mounted on a stationary body adjacent said movable body, said receiver including A third coil located proximate the second coil when the first coil is located proximate a magnetic field source mounted on said stationary body, said source being capable of inducing a current in said first coil when proximate said first coil;

a magnetically operated switch connected in parallel with said first coil and operated by said source as current is induced in said first coil so as to produce a back E.M.F. which is inductively coupled by the second coil to said third coil to produce a pulse thereon; and

means joined to said third coil for sensing pulses induced on said third coil.

8. A device as set forth in claim 7, wherein said movable body is rotatable.