Abnormal condition signal transmitting device for a rotating body

• US 5,500,637 A
• Filed: 02/22/1994
• Issued: 03/19/1996
• Est. Priority Date: 02/22/1993
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Original Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Inventors: Kokubu, Sadao
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US08/199,951
• Time in Patent Office: 756 Days
• Field of Search: 340/447, 340/442, 340/445, 340/425.5, 340/426, 340/825.69, 340/825.72, 340/539, 340/517, 340/521, 73/146.2, 73/146.4, 73/146.5, 73/146.8, 11/11
• US Class Current: 340/447
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver

Abstract

A tire abnormal condition alarming system for a vehicle includes a remote control device including: a signal receiver for receiving receive a door unlocking or locking aerial propagation signal from an operating key; a door locking mechanism operated according to the signal reception of the signal receiver; and a signal transmitter coupled to a tire of the motor vehicle, the signal transmitter detecting an abnormal condition of the body of revolution to transmit an abnormal condition detection signal as an aerial propagation signal to the signal receiver, an alarming device for performing a warning operation to inform the occurrence of the abnormal condition with the vehicle by operating the signal receiver upon reception of the abnormal condition detection signal from the signal transmitter.

Claims

1. A tire abnormal condition alarming system for a vehicle comprising:

a remote control device including;

a signal receiver for receiving a door unlocking or locking aerial propagation signal from an operating key;

a door locking mechanism operated according to the signal reception of the signal receiver, to unlock or lock a door;

a signal transmitter coupled to a tire of the motor vehicle, the signal transmitter detecting an abnormal condition of the tire to transmit an abnormal condition detection signal as an aerial propagation signal to the signal receiver; and

alarming means for performing a warning operation to inform the occurrence of the abnormal condition of the tire by operating the signal receiver upon reception of the abnormal condition detection signal from the signal transmitter.

2. A tire abnormal condition alarming system for a vehicle as claimed in claim 1, wherein the signal transmitter includes:

at least two abnormal condition detecting switches turned off upon detection of an abnormal condition of the tire;

a DC source having one of its terminals grounded through one of the abnormal condition detecting switches;

a switching element with a control terminal which is grounded through another of the abnormal condition detecting switches and is connected through bias means to another terminal of the DC source; and

an oscillator for outputting the abnormal condition detection signal as an aerial propagation signal when the switching element is turned on.

3. A tire abnormal condition alarming system for a vehicle as claimed in claim 2, wherein the abnormal condition detecting switches include:

a plurality of electrically conductive brackets which are connected to a body casing and are secured to a hub of the tire with hub nuts through insulating layers interposed between the tire and the brackets,

wherein the abnormal condition detecting switches are held turned on with the brackets electrically in contact with the hub nuts.

4. A tire abnormal condition alarming system for a vehicle as claimed in claim 1, wherein the alarming means is operated according to a current state of the tire.

5. An abnormal condition detecting device for a tire comprising:

at least two abnormal condition detecting switches turned off upon detection of an abnormal condition of the tire;

a DC source having one of its terminals grounded through one of the abnormal condition detecting switches;

a switching element with a control terminal which is grounded through another of the abnormal condition detecting switches and is connected through a bias element to another terminal of the DC source; and

an oscillator for outputting an abnormal condition detection signal as an aerial propagation signal when the switching element is turned on.

6. An abnormal condition detecting device for a tire as claimed in claim 5, wherein the abnormal condition detecting switches include:

a plurality of electrically conductive brackets which are connected to a body casing and are secured to a hub of the tire with hub nuts through insulating layers interposed between the tire and the brackets,

wherein the abnormal condition detecting switches are held turned on with the brackets electrically in contact with the hub nuts.