Power cord having thermal sensor

Patent metadata

Field	Value
Publication number	US-9589745-B2
Application number	US-201313957742-A
Country	US
Kind code	B2
Filing date	Aug 2, 2013
Priority date	Sep 11, 2012
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A power cord includes a plug having blades and a thermal sensor configured to detect a temperature, and a cut-off means configured to stop electric power from being supplied to the load connection portion from the blades when a temperature detected with the thermal sensor is higher than a prescribed temperature. The plug includes a core which retains the blades and the thermal sensor, and an enclosure which is formed by molding synthetic resin to cover an outside of the core. A part of the thermal sensor protrudes from the core to be buried in the enclosure.

First claim

The invention claimed is:

1. A power cord, comprising:
a plug comprising blades configured to be inserted into blade insertion holes of an electrical outlet, respectively, and a thermal sensor configured to detect a temperature;
a load connector configured to be connected to a load; and
a cut-off switch configured to stop electric power from being supplied to the load connector from the blades when a temperature detected with the thermal sensor is higher than a prescribed temperature,
wherein the plug further comprises: a core which retains the blades and the thermal sensor; and an enclosure which is formed by molding synthetic resin to cover an outside of the core,
wherein the core includes: an inner frame retaining the blades; and a case,
wherein the case is shaped like a cylinder having a base on a front side and an opening on a rear side, and the base is provided with through holes into which the blades are inserted,
wherein the base of the case is provided with a fitting hole, and the thermal sensor has a fitting portion fitted into the fitting hole,
wherein the thermal sensor penetrates through the base of the case, and a tip of the fitting portion of the thermal sensor protrudes from the base and is buried in contact with the enclosure.

2. The power cord of claim 1 ,
wherein the thermal sensor is configured to detect a temperature around a tip of the fitting portion, and
wherein the enclosure is in contact with the tip of the fitting portion while the enclosure covers all over the tip of the fitting portion.

Assignees

• Panasonic Corp
• Panasonic Ip Man Co Ltd

Inventors

• Kondou Maki
• Kawamoto Takashi
• Tomiyama Ryota

Classifications

• H02H5/043

  the temperature dependent resistor being disposed parallel to a heating wire, e.g. in a heating blanket · CPC title

• H01R24/30

  with additional earth or shield contacts · CPC title

• H01R13/7137

  with thermal interrupter (H01R13/7132 takes precedence) · CPC title

• H01R13/6683 Primary

  with built-in sensor · CPC title

• H01H9/54 Primary

  Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere · CPC title