FLASHLIGHT WITH A HEAT SINK

• US 20110134632A1
• Filed: 12/08/2009
• Published: 06/09/2011
• Est. Priority Date: 12/08/2009
• Status: Active Grant

• Current Assignee: Yung-Ching Hu
• Original Assignee: Yung-Ching Hu
• Inventors: HU, Yung-Ching
• Granted Patent: US 8,087,808 B2
• Time in Patent Office: Days
• US Class Current: 362/190
• CPC Class Codes: F21L 4/005 the device being a pocket lamp F21L4/022, F21L4/045, F21L4/085 take precedence
• CPC Class Codes: F21V 29/767 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A flashlight has a handle assembly and a lens cover. The handle assembly has a housing, a heat sink and en electrical unit. The housing has a front end. The heat sink is mounted in the housing and has a front end and a rear end. The electrical unit is mounted in the housing and detachably mounted on the rear end of the heat sink. The lens cover is securely mounted on the front end of the housing and has an LED element mounted securely on the heat sink. The lens cover has an LED electrically connected with the electrical unit with wires. Because the LED element and the electrical unit are separated by the heat sink, heat generated from the LED can be dissipated though the heat sink, instead of being directly conducted to the electrical unit and damaging the electrical unit.

Claims

1. A flashlight comprising:

a handle assembly having

a housing having a front end;

a heat sink mounted in the housing and having

a front end;

a rear end;

a connecting section defined around the front end of the heat sink; and

an electrical unit mounted in the housing and detachably mounted on the rear end of the heat sink; and

a lens cover securely mounted on the front end of the housing and having

a shell mounted securely on the front end of the housing; and

an LED element mounted in the shell and mounted securely on the connecting section and having an LED electrically connected with the electrical unit with wires.

2. The flashlight as claimed in claim 1, wherein

the housing has a rear end;

the handle assembly has two batteries mounted in the housing near the rear end of the housing;

the heat sink has a tube having a front end and a rear end;

the connecting section is defined around the front end of the tube; and

the electrical unit is detachably mounted on the rear end of the tube and is electrically connected with the batteries.

3. The flashlight as claimed in claim 1, wherein

the housing has

an outer surface;

a dissipating section defined around the outer surface near the front end of the housing; and

multiple vents defined though the dissipating section.

4. The flashlight as claimed in claim 2, wherein

the housing has

an outer surface;

a dissipating section defined around the outer surface near the front end of the housing; and

multiple vents defined though the dissipating section.

5. The flashlight as claimed in claim 4, wherein

the housing has an inner surface;

the dissipating section has a front segment and a rear segment; and

the tube has an outer surface and the heat sink has two annular flanges which protrude from the outer surface of the tube, abut the inner surface of the housing and are respectively near the front segment and the rear segment of the dissipating section.

6. The flashlight as claimed in claim 5, wherein the heat sink has two O-rings which are respectively mounted around the flanges.

7. The flashlight as claimed in claim 1, wherein the LED element is screwed on the connecting section of the heat sink and has an LED.

8. The flashlight as claimed in claim 6, wherein the LED element is screwed on the connecting section of the heat sink and has an LED.