LED wayside signal for a railway

• US 6,435,459 B1
• Filed: 10/28/1999
• Issued: 08/20/2002
• Est. Priority Date: 10/28/1999
• Status: Expired due to Term

• Current Assignee: Dialight Corporation (Dialight PLC)
• Original Assignee: Dialight Corporation (Dialight PLC)
• Inventors: Oesterheld, Klaus, Sanderson, John Richard, Eikelberger, Rand
• Primary Examiner(s): Morano, S. Joseph
• Assistant Examiner(s): McCarry, Jr., Robert J.
• Application Number:
  US09/429,351
• Time in Patent Office: 1,027 Days
• Field of Search: 246/1.R, 246/1.C, 246/473.1, 246/473.3, 246/477, 246/478
• US Class Current: 246/473.3
• CPC Class Codes: B61L 2207/02 using light-emitting diodes [LEDs]
• CPC Class Codes: B61L 5/1827 using light sources of different colours and a common optical system

Abstract

A wayside signal for a railway includes a plurality of light emitting diodes housed in a housing. The light emitting diodes output indication signals. Further, the light emitting diodes are configured on a first circuit board which is thermally coupled to the housing. The housing may also include heat sink fins to dissipate heat generated by the light emitting diodes and associated driving circuitry for driving the light emitting diodes also contained within the housing. An additional light emitting diode may also be contained within the housing to point in an opposite direction than the indication signal light emitting diodes, which additional light emitting diode may be formed on a second circuit board with the driving circuitry. The additional light emitting diode provides an indication to anyone behind the wayside signal as to the indication of the wayside signal. The wayside signal is further optimized for thermal efficiency and to be sealed against the elements. In regard to thermal efficiency, the first circuit board may be metal clad and the housing may be formed of black anodized aluminum. Also, a plastic insulator may be attached to the housing and covered with a lamp base. The lamp base may be configured to be inserted into a conventional socket for a wayside signal, so that the wayside signal of the present invention can be utilized with existing circuitry.

Claims

1. A wayside signal for a railway comprising:

(a) a housing;

(b) at least one first light emitting diode housed in said housing and configured to output at least one indication signal; and

(c) a first circuit board on which said at least one first light emitting diode is mounted, said first circuit board being thermally coupled to said housing; and

(d) a second circuit board containing drive circuitry for driving said at least one first light emitting diode.

2. A wayside signal for a railway according to claim 1, further comprising (e) heat sink fins mounted on said housing and positioned between said first and second circuit boards.

3. A wayside signal for a railway according to claim 1, further comprising (e) at least one second light emitting diode mounted on said second circuit board and configured to emit light in an opposite direction as said at least one first light emitting diode.

4. A wayside signal for a railway according to claim 1, wherein said first circuit board is metal clad.

5. A wayside signal for a railway according to claim 1, wherein said housing is formed of die cast black anodized aluminum.

6. A wayside signal for a railway according to claim 1, further comprising (e) a lamp base and (f) an insulator attached between said housing and lamp base, said lamp base being configured to be inserted into a socket.

7. A wayside signal for a railway according to claim 6, wherein said lamp base includes a bayonet connection to be inserted into the socket.

8. A wayside signal for a railway according to claim 1, wherein said first circuit board is metal clad and said second circuit board is formed of glass epoxy.

9. A wayside signal for a railway comprising:

(a) housing means for housing various elements;

(b) first light emitting means housed in said housing means for outputting at least one indication signal;

(c) first support means for supporting said first light emitting means, said first support means being thermally coupled to said housing means; and

(d) second support means for supporting drive circuitry for driving said first light emitting means.

10. A wayside signal for a railway according to claim 9, further comprising (e) heat dissipating means mounted on said housing means between said first and second support means for dissipating heat generated in said housing means.

11. A wayside signal for a railway according to claim 9, further comprising (e) second light emitting means mounted on said second support means for emitting light in an opposite direction as said first light emitting means.

12. A wayside signal for a railway according to claim 9, further comprising (e) connecting means attached to said housing means for connecting said wayside signal into a socket.