Switch assembly

• US 5,373,125 A
• Filed: 03/23/1993
• Issued: 12/13/1994
• Est. Priority Date: 03/23/1993
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Pottala, James V., Ford, Robert B.
• Primary Examiner(s): Scott, J. R.
• Application Number:
  US08/035,774
• Time in Patent Office: 630 Days
• Field of Search: 200/61.45 R-61.53, 200/61.45 M, 335/205, 338/32 R, 338/38 H, 455/89, 455/90, 455/899
• US Class Current: 200/61.52
• CPC Class Codes: H01H 35/022 the switch being of the reed switch type
• CPC Class Codes: H03K 17/9517 using galvanomagnetic devices

Abstract

A tilt switch assembly (100) includes a hall-effect device (102) for determining if a magnet (110) which is placed within a housing (112) has tilted a predetermined amount causing the hall-effect device to actuate. In another embodiment of the invention (300), a movable magnetic filed concentrator (306) which moves in response to switch assembly (300) being tilted causes a tilt condition signal to be generated when the switch assembly (300) is tilted a predetermined amount. In still another embodiment of the present invention, a magnet (502) is stored within a cavity area which allows for the magnet to tilt when the switch assembly (500) is tilted a predetermined amount. Once the magnet (502) becomes tilted, a tilt condition signal is generated.

Claims

1. A tilt switch assembly, comprising:

a housing member having an outer wall;

a magnetic field source which generates a magnetic field attached to the housing member;

a tilt switch housing having a cavity area defined by a floor and an inner wall having a predetermined wall angle relative to the floor, the housing member located inside of the housing cavity area and resting on top of the cavity floor; and

a magnetic field detector located within the tilt switch housing and underneath the floor of the cavity area, the magnetic field detector is responsive to the magnetic field for providing a tilt condition signal when the housing member outer wall tilts a predetermined amount towards the cavity walls causing the magnetic field to change orientation away from the magnetic field detector.

2. A tilt switch assembly as defined in claim 1, wherein the magnetic field source comprises a cylindrical shaped permanent magnet.

3. A tilt switch assembly as defined in claim 2, wherein the magnetic field detector comprises a Hall Effect device.

4. A communication device, comprising:

a radio frequency transmitter; and

a tilt switch coupled to the radio frequency transmitter, comprising;

a housing member having an outer wall;

a magnetic field source which generates a magnetic field attached to the pivotal housing member;

a tilt switch housing having a cavity area defined by a floor and an inner wall having a predetermined wall angle relative to the floor, the housing member located inside of the housing cavity area and resting on top of the cavity floor;

a magnetic field detector located within the housing and underneath the floor of the cavity area, the magnetic field detector is responsive to the magnetic field and provides a tilt condition signal to the radio frequency transmitter when the housing member outer wall tilts a predetermined amount towards the cavity walls causing the magnetic field generated by the magnetic field source to change orientation away from the, magnetic field detector.

5. A communication device as defined in claim 4, wherein:

the radio frequency transmitter transmits an emergency message in response to it receiving the tilt condition signal from the magnetic field detector.

6. A communication device as defined in claim 5, wherein the magnetic field source comprises a permanent magnet and the magnetic field detector comprises a Hall Effect device.

7. A tilt switch, comprising:

a housing;

a magnetic field source which generates a magnetic field attached to the housing;

a magnetic field detector located within the housing and spaced away from the magnetic field source;

the housing including a cavity area located between the magnetic field source and the magnetic field detector;

a magnetic field concentrator located within the cavity area, the magnetic field concentrator moves within the cavity area in response to the tilting of the housing, the magnetic field concentrator directs the magnetic field provided by the magnetic field source to the magnetic field detector when the housing is not tilted and stops directing the magnetic field to the magnetic field detector when the housing is tilted a predetermined amount; and

the magnetic field detector provides a tilt condition signal when the magnetic field concentrator fails to direct the magnetic field to the magnetic field.

8. A tilt switch as defined in claim 7, wherein the magnetic field concentrator comprises a spherical metal member.

9. A tilt switch as defined in claim 8, wherein the magnetic field source comprises a permanent magnet and the magnetic field detector comprises a Hall Effect device.

10. A tilt switch as defined in claim 9, wherein the housing cavity area has a curved floor which helps retain the spherical metal member in substantial alignment between the permanent magnet and the Hall Effect device until the housing is tilted a predetermined amount.