Instrument panel assembly

• US 4,214,227 A
• Filed: 06/19/1978
• Issued: 07/22/1980
• Est. Priority Date: 04/08/1976
• Status: Expired due to Term

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Tractor Co (Caterpillar Incorporated)
• Inventors: Papasideris, Stamos I.
• Primary Examiner(s): Waring, Alvin H.
• Application Number:
  US05/917,135
• Time in Patent Office: 764 Days
• Field of Search: 340/52 F, 340/79, 340/80, 340/514, 340/517, 340/641, 340/642
• US Class Current: 340/459
• CPC Class Codes: B60K 37/00 Dashboards as road-vehicle superstructure sub-units B62D25/14
• CPC Class Codes: B60Q 11/00 Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
• CPC Class Codes: G08B 19/00 Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
• CPC Class Codes: G08B 29/126 of annunciator circuits
• CPC Class Codes: H05B 47/20 Responsive to malfunctions or to light source life; for protection

Abstract

An instrument panel assembly having a plurality of indicating elements and a test switch for concurrently indicating the operability of the individual indicating elements. A plurality of electrical devices is connected in association with the test switch and indicating elements so as to prevent false concurrent operation of the indicating elements. The assembly may include circuitry for causing an intermittent alarm as an additional test indication during the testing of one or more of the indicating elements.

Claims

1. In a signaling system having a plurality of indicator lamps connected in parallel, a corresponding plurality of control switches connected respectively in series with said indicator lamps for selectively energizing said lamps, and an alarm, the improvement comprising

circuit means for connecting said alarm in parallel with a first portion only of said plurality of indicator lamps for concurrent operation of said alarm and first portion of the lamps upon closing of any of the control switches associated therewith to energize the associated indicator lamps of said first portion and permitting energization of the remainder of said lamps by their associated control switches without energization of said alarm.

2. The signaling system of claim 1 including means for causing said alarm to be energized intermittently.

3. The signaling system of claim 1 wherein said alarm comprises a warning light.

4. The signaling system of claim 1 wherein said alarm comprises an audio alarm.

5. The signaling system of claim 1 further including means for testing the operability of said alarm including a test switch and means for connecting said test switch in parallel with each of said control switches.

6. The signaling system of claim 1 further including means for concurrently testing the operability of each of said indicator lamps including a test switch and means for connecting said test switch in parallel with each of said control switches.

7. The signaling system of claim 1 further including means for concurrently testing the operability of said alarm and said indicator lamps including a test switch and means for connecting said test switch in parallel with each of said control switches.

8. The signaling system of claim 7 further including means for limiting the current to said means for testing.

9. In a signaling system having a plurality of indicator lamps connected in parallel, a corresponding plurality of control switches connected respectively in series with said indicator lamps for selectively energizing said lamps, and a plurality of alarms, the improvement comprising

circuit means including first means for connecting said plurality of alarms in parallel with a first portion only of said plurality of indicator lamps for concurrent operation thereof upon closing of any of the control switches associated therewith to energize the associated indicator lamps, and second means for connecting a portion only of said plurality of alarms in parallel with a second portion of said plurality of indicator lamps different from said first portion thereof for concurrent operation of said portion of the alarms and said portion of the lamps upon closing of the control switches associated with said second portion of the plurality of indicator lamps.

10. The signaling system of claim 9 wherein one of said alarms comprises a visual alarm.

11. The signaling system of claim 9 wherein one of said alarms comprises an audio alarm.

12. The signaling system of claim 9 wherein said first means comprises means for connecting all of said alarms in parallel with said first portion of the indicator lamps.

13. The signaling system of claim 9 wherein said second means comprises means for connecting only one of said alarms in parallel with said second portion of the indicator lamps.

14. The signaling system of claim 9 wherein said first and second portions of said plurality of indicator lamps total less than all of said indicator lamps whereby a third portion of said plurality of indicator lamps is arranged to be energized free of concurrent energization of any of said plurality of alarms.

15. The signaling system of claim 9 further including means for concurrently testing the operability of each of said alarms and said indicator lamps including a test switch and means for connecting said test switch in parallel with each of said control switches.

16. The signaling system of claim 9 further including means for concurrently testing the operability of each of said alarms and said indicator lamps including a test switch and means for connecting said test switch in parallel with each of said control switches and a lamp connected in series with said test switch adapted to become open circuited upon the current passing through the test switch reaching a preselected high level.

17. In an instrument panel assembly having a display panel having a vertical portion carrying first instrumentation and a plurality of electrical indicator lamps adjacent said first instrumentation, said panel further having a downwardly facing portion spaced from said vertical portion, an electrical power source having first and second terminals, means connecting the lamps in parallel to said first terminal of the power source, and control switches connected one each in series with the respective lamps and in parallel to said second terminal of the power source for providing selective energization of said lamps from said power source, an improved lamp testing circuit comprising:

a normally open manually operable test switch carried by said panel downwardly facing portion in adjacent spaced relations to said indicator lamps, said switch being electrically connected to said second terminal and being spaced rearwardly of said vertical portion of the display panel to avoid inadvertent accidental throwing thereof;

a plurality of lenses one each covering said lamps on said panel, said lenses being removable from forwardly of the panel to permit replacement of each lamp individually from forwardly of said panel;

a plurality of diodes carried on the rear of said panel in rearwardly spaced relation to said indicator lamps, said diodes being electrically connected one each to between the respective connected lamps and control switches and through said test switch to said second terminal, all of said diodes being arranged to permit current flow in the same direction relative to said test switch, whereby closing of the test switch causes concurrent energization of each operative lamp from said power source, said test switch having a moving contact connected solely to said second terminal and a fixed contact connected solely to said diodes whereby closing of said switch makes an electrical connection from said second terminal solely to said diodes thereby effectively positively providing an indication of the operative condition of each lamp; and

an alarm associated with one of said control switches to be operated and tested concurrently with its associated indicator lamp.

18. The instrument panel assembly of claim 17 wherein an additional alarm is provided associated with a control switch whereby said alarms may be operated and tested concurrently with their associated indicator lamps.