Flashlight

• US 7,758,205 B2
• Filed: 08/05/2008
• Issued: 07/20/2010
• Est. Priority Date: 08/05/2008
• Status: Active Grant

• Current Assignee: Yun-Zhao Liu
• Original Assignee: Yun-Zhao Liu
• Inventors: Liu, Yun-Zhao
• Primary Examiner(s): O'Shea; Sandra L
• Assistant Examiner(s): MACCHIAROLO, LEAH SIMONE
• Application Number:
  US12/222,188
• Publication Number:
  US 20100033962A1
• Time in Patent Office: 714 Days
• Field of Search: 362202-206, 362/188, 362/194, 362/196, 362/197
• US Class Current: 362/202
• CPC Class Codes: F21L 4/027 the light sources being a LED
• CPC Class Codes: F21V 14/025 in portable lighting devices
• CPC Class Codes: F21V 19/02 with provision for adjustment, e.g. for focusing
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A flashlight includes a lamp support, an electric light-generating mechanism in the lamp support, a covering member around the lamp support, a barrel body joined on the covering member, and an adjustment member; the adjustment member is threadedly joined in the lamp support, and can be turned to adjust a position of a focal point of light emitted from a light source of the light-generating mechanism; front and rear heat-conducting components are positioned on front and rear ends of the light-generating mechanism respectively, and they contact the lamp support and the barrel body respectively; heat produced from functioning of the light-generating mechanism will be conducted away from the front heat-conducting component to the lamp support and from the rear heat-conducting component to the barrel body, and the light source is prevented from being damaged by the heat produced from it continuing shining for an extended length of time.

Claims

1. A flashlight, comprising

a lamp support;

the lamp support having a joining part;

the lamp support having a light-reflecting cup adjoining a first end of the joining part;

the joining part having a threaded portion on a second end thereof;

an electric light-generating mechanism held in the joining part of the lamp support;

the electric light-generating mechanism including a circuit board, and a light source;

the circuit board having a controlling circuit thereon;

a front heat-conducting component interposed between the lamp support and the electric light-generating mechanism;

an adjustment member for adjusting a position of a focal point of light emitted from the light source;

the adjustment member having a threaded portion on an outer circumferential side thereof;

the adjustment member being threadedly joined on the threaded portion of the joining part;

a barrel body;

the barrel body being hollow;

the barrel body having a button switch fitted on a rear end thereof;

a power supplying mechanism held in the barrel body to supply electricity to the electric light-generating mechanism;

the button switch being electrically connected to the power supply mechanism and the controlling circuit on the circuit board of the electric light-generating mechanism;

a rear heat-conducting component interposed between the adjustment member and the barrel body; and

a covering member;

the covering member being positioned around the light-reflecting cup of the lamp support and joined on the barrel body.

2. The flashlight as claimed in claim 1, wherein the light source is a light emitting diode.

3. The flashlight as claimed in claim 1, wherein the front heat-conducting component is a metallic spring.

4. The flashlight as claimed in claim 3, wherein the joining part of the lamp support has a locating groove on the first end thereof, and one end of the front heat-conducting component is held in the locating groove of the joining part of the lamp support.

5. The flashlight as claimed in claim 1, wherein the rear heat-conducting component is a metallic spring.

6. The flashlight as claimed in claim 5, wherein the adjustment member has an annular groove on an outer circumferential side thereof, and one end of the rear heat-conducting component is embedded in the annular groove of the adjustment member.

7. The flashlight as claimed in claim 1, wherein the adjustment member has a plurality of gaps on one end thereof, which faces the rear heat-conducting component.

8. The flashlight as claimed in claim 1, wherein the joining part of the lamp support has a locating groove on the first end thereof, and one end of the front heat-conducting component is held in the locating groove of the joining part of the lamp support.

9. The flashlight as claimed in claim 1, wherein the adjustment member has an annular groove on an outer circumferential side thereof, and one end of the rear heat-conducting component is embedded in the annular groove of the adjustment member.