Thermal fuse resistor

• US 8,400,252 B2
• Filed: 04/21/2010
• Issued: 03/19/2013
• Est. Priority Date: 04/21/2009
• Status: Active Grant

• Current Assignee: Smart Electronics, Inc.
• Original Assignee: Smart Electronics, Inc.
• Inventors: Jung, Jong Il, Kang, Doo Won, Ahn, Gyu Jin, Kim, Sung Kwang, Lee, Kyung Mi
• Primary Examiner(s): Vortman, Anatoly
• Application Number:
  US13/265,732
• Publication Number:
  US 20120038450A1
• Time in Patent Office: 1,063 Days
• Field of Search: 337/4, 337/6, 337/20, 337/35, 337/401, 337182-184, 337/186, 337/187, 337/414, 337/112, 337/327, 337/380, 337/398, 361/837
• US Class Current: 337/186
• CPC Class Codes: H01H 85/0052 Fusible element and series heating means or series heat dams
• CPC Class Codes: H01H 85/048 Fuse resistors
• CPC Class Codes: H01H 85/175 characterised by the casing shape or form

Abstract

Disclosed is a fuse resistor representing superior manufacturing efficiency and assembling reliability. The fuse resistor includes a resistor, a thermal fuse that is disconnected by heat generated from the resistor, and a case receiving the resistor and the thermal fuse therein and having a space section for transferring radiant heat of the resistor to the thermal fuse. Fillers are not required so that the manufacturing process is simplified. Since the assembling process is completed by covering a body of the case with a cap after the resistor and the thermal fuse have been inserted into the body, the manufacturing efficiency is improved.

Claims

1. A fuse resistor comprising:

a resistor;

a thermal fuse that is disconnected by heat generated from the resistor; and

a case receiving the resistor and the thermal fuse therein and having a space section for transferring radiant heat of the resistor to the thermal fuse, wherein the case comprises a resistor holder that surrounds the resistor, a fuse holder that surrounds the thermal fuse, and a neck section that connects the resistor holder with the fuse holder, and the space section is provided in the neck section, wherein the resistor holder and the fuse holder protrude from the case and have circular shapes, and wherein the resistor holder and the fuse holder have arc-shape sections rounded more than a semicircle to surround the resistor and the thermal fuse, respectively.

2. The fuse resistor as claimed in claim 1, wherein the case comprises synthetic resin.

3. The fuse resistor as claimed in claim 1, wherein the case comprises:

a body having a top portion being open and a bottom portion formed with perforation holes, in which lead wires of the resistor and the thermal fuse pass through the perforation holes; and

a cap assembled with the top portion of the body.

4. The fuse resistor as claimed in claim 3, wherein the case further comprises a setting section for fixing the resistor.

5. The fuse resistor as claimed in claim 2, wherein the case comprises:

a body having a top portion being open and a bottom portion formed with perforation holes, in which lead wires of the resistor and the thermal fuse pass through the perforation holes; and

a cap assembled with the top portion of the body.

6. The fuse resistor as claimed in claim 4, wherein the setting section comprises:

a pressing protrusion protruding from the cap; and

a lead wire guide hole for fixing a lead wire of the resistor connected to the thermal fuse.

7. The fuse resistor as claimed in claim 3, wherein the perforation holes are tapered in the case.

8. The fuse resistor as claimed in claim 3, wherein a coupling protrusion inclined in one direction is provided at one of the cap and the body and a coupling slot is formed in remaining one of the cap and the body to press-fit cap into the body.

9. The fuse resistor as claimed in claim 5, wherein the case further comprises a setting section for fixing the resistor.

10. The fuse resistor as claimed in claim 9, wherein the setting section comprises:

a pressing protrusion protruding from the cap; and

a lead wire guide hole for fixing a lead wire of the resistor connected to the thermal fuse.

11. The fuse resistor as claimed in claim 5, wherein the perforation holes are tapered in the case.

12. The fuse resistor as claimed in claim 5, wherein a coupling protrusion inclined in one direction is provided at one of the cap and the body and a coupling slot is formed in remaining one of the cap and the body to press-fit the cap into the body.

13. A fuse resistor comprising:

a resistor;

a thermal fuse that is disconnected by heat generated from the resistor; and

a case receiving the resistor and the thermal fuse therein and having a space section for transferring radiant heat of the resistor to the thermal fuse, wherein the case comprises a resistor holder that surrounds the resistor, a fuse holder that surrounds the thermal fuse, and a neck section that connects the resistor holder with the fuse holder, and the space section is provided in the neck section,

wherein the case comprises;

a body having a top portion being open and a bottom portion formed with perforation holes, in which lead wires of the resistor and the thermal fuse pass through the perforation holes; and

a cap assembled with the top portion of the body,

wherein the case further comprises a setting section for fixing the resistor,

wherein the setting section comprises;

a pressing protrusion protruding from the cap; and

a lead wire guide hole for fixing a lead wire of the resistor connected to the thermal fuse.

14. A fuse resistor comprising:

a resistor;

a thermal fuse that is disconnected by heat generated from the resistor; and

a case receiving the resistor and the thermal fuse therein and having a space section for transferring radiant heat of the resistor to the thermal fuse, wherein the case comprises a resistor holder that surrounds the resistor, a fuse holder that surrounds the thermal fuse, and a neck section that connects the resistor holder with the fuse holder, and the space section is provided in the neck section,

wherein the case comprises;

a body having a top portion being open and a bottom portion formed with perforation holes, in which lead wires of the resistor and the thermal fuse pass through the perforation holes; and

a cap assembled with the top portion of the body,

wherein the perforation holes are tapered in the case.

15. The fuse resistor as claimed in claim 14, wherein a coupling protrusion inclined in one direction is provided at one of the cap and the body and a coupling slot is formed in remaining one of the cap and the body to press-fit the cap into the body.