JPS57157956A - Frame foot-warmer - Google Patents

Frame foot-warmer

Info

Publication number
JPS57157956A
JPS57157956A JP4298281A JP4298281A JPS57157956A JP S57157956 A JPS57157956 A JP S57157956A JP 4298281 A JP4298281 A JP 4298281A JP 4298281 A JP4298281 A JP 4298281A JP S57157956 A JPS57157956 A JP S57157956A
Authority
JP
Japan
Prior art keywords
person
ultrasonic
heater
comparator
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP4298281A
Other languages
Japanese (ja)
Other versions
JPS6329171B2 (en
Inventor
Takeshi Kuriyama
Takashi Ikehara
Takashi Miyahara
Akira Kurita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP4298281A priority Critical patent/JPS57157956A/en
Publication of JPS57157956A publication Critical patent/JPS57157956A/en
Publication of JPS6329171B2 publication Critical patent/JPS6329171B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1902—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

PURPOSE:To improve the effect of saving of electricity, by detecting whether a person is using a foot warmer or not by an ultrasonic signal, etc., and controlling to throw a current to a heater by the detected signal. CONSTITUTION:The signals dispatched from a high-frequency oscillator 16 and a low-frequency oscillator 17 drive a ultrasonic transmitter 4 through a transmitter driving circuit 24 to dispatch ultrasonic waves. If a person 3 is positioned in a predetermined distance from a window comparator 10, the ultrasonic waves are reflected as ultrasonic waves having a particular waveform which are inputted into an ultrasonic receiver 5, and then are inputted through an amplifier 7 to a comparator 8 to compare them with a reference signal. In this case, depending on the presence or absence of the person 3, as the waveforms differ, a prescribed signal is issued from the comparator 8 if there is the person 3, so that a relay 13b is closed, and an alternative current is passed to the heater 2 of the foot warmer. Thus, depending on the presence or absence of the user, the heater is automatically switched on or off to improve the effect of saving of electricity.
JP4298281A 1981-03-23 1981-03-23 Frame foot-warmer Granted JPS57157956A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4298281A JPS57157956A (en) 1981-03-23 1981-03-23 Frame foot-warmer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4298281A JPS57157956A (en) 1981-03-23 1981-03-23 Frame foot-warmer

Publications (2)

Publication Number Publication Date
JPS57157956A true JPS57157956A (en) 1982-09-29
JPS6329171B2 JPS6329171B2 (en) 1988-06-13

Family

ID=12651236

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4298281A Granted JPS57157956A (en) 1981-03-23 1981-03-23 Frame foot-warmer

Country Status (1)

Country Link
JP (1) JPS57157956A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62141110U (en) * 1986-02-27 1987-09-05
JPH0198826A (en) * 1987-10-08 1989-04-17 Hitachi Heating Appliance Co Ltd Electric foot warmer
JPH04228797A (en) * 1991-05-28 1992-08-18 Hitachi Constr Mach Co Ltd Method for executing widened bottom pile by earth drill process

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5798750A (en) * 1980-12-09 1982-06-19 Hitachi Heating Appliance Co Ltd Electric kotatsu

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5798750A (en) * 1980-12-09 1982-06-19 Hitachi Heating Appliance Co Ltd Electric kotatsu

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62141110U (en) * 1986-02-27 1987-09-05
JPH02567Y2 (en) * 1986-02-27 1990-01-09
JPH0198826A (en) * 1987-10-08 1989-04-17 Hitachi Heating Appliance Co Ltd Electric foot warmer
JPH04228797A (en) * 1991-05-28 1992-08-18 Hitachi Constr Mach Co Ltd Method for executing widened bottom pile by earth drill process
JPH0577840B2 (en) * 1991-05-28 1993-10-27 Hitachi Construction Machinery

Also Published As

Publication number Publication date
JPS6329171B2 (en) 1988-06-13

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