US3924255A - Explosion-proof type switch box with alarm device - Google Patents

Explosion-proof type switch box with alarm device Download PDF

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Publication number
US3924255A
US3924255A US421639A US42163973A US3924255A US 3924255 A US3924255 A US 3924255A US 421639 A US421639 A US 421639A US 42163973 A US42163973 A US 42163973A US 3924255 A US3924255 A US 3924255A
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US
United States
Prior art keywords
machine
light source
source means
transparent plate
window opening
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.)
Expired - Lifetime
Application number
US421639A
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English (en)
Inventor
Shinjiro Mori
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.)
Daikokuya Holdings Co Ltd
Original Assignee
Mori Denki Manufacturing Co Ltd
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 Mori Denki Manufacturing Co Ltd filed Critical Mori Denki Manufacturing Co Ltd
Application granted granted Critical
Publication of US3924255A publication Critical patent/US3924255A/en
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Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00

Definitions

  • the box has a window opening and push buttons are provided.
  • An ampere meter and a switch are arranged within the box adjacent the window opening and the push buttons, respectively.
  • An indication lamp is located on the upper face of the switch, electric lamps of green and red colors being mounted at the back side of the window opening and within the indication lamp and the lamps are connected in parallel with each other.
  • the green lamps are set to light during normal operation of a machine connected to the switch of this invention while red lamps are set to light upon occurence of any abnormal condition in the machine.
  • This invention relates to a pressureand'explosionproof type switch, and more particularly to a switch wherein it is possible to observe an operative condition of machines connected to the switch through a window opening provided on the front face of the switch and by means of the color of electric lamps adapted to light in an indication lamp provided on the upper wall of the switch.
  • This invention is directed to a-pressureand explosion-proof type switch provided on its front wall with a window opening through which a pointer of an ampere meter can be read out.
  • Two electric lamps of green and red colors respectively are positioned on the back side of the window opening, an indication lamp is mounted on the upper wall of the switch body, and two electric lamps are connected in parallel with said two lamps in the window opening and are mounted inside the indication lamp in such a manner that electric lamps of the same color are lit simultaneously so that the green electric lamp may light when the machines connected to the switch operates normally while the red electric lamp may light when an abnormal condition occurs in the machine.
  • a further object of this invention is to provide a switch having a device for detection of an abnormal condition, in which a screen is mounted on an arm extending towards the pointer of an ampere meter so as to synchronize therewith, a neon lamp and CdS (a cadmium photoconductive cell) are provided at the front and back sides of the screen, and a change in a current flowing through the cadmium photoconductive cell, which occurs upon interruption of light from the neon lamp by the screen, is transmitted to a relay circuit to actuate the same so that the electrical lamps of green and red colors are switched.
  • a switch having a device for detection of an abnormal condition, in which a screen is mounted on an arm extending towards the pointer of an ampere meter so as to synchronize therewith, a neon lamp and CdS (a cadmium photoconductive cell) are provided at the front and back sides of the screen, and a change in a current flowing through the cadmium photoconductive cell, which occurs upon interruption of light from the neon lamp by the screen
  • FIG. 1 is a front view of the switch
  • FIG. 2 is a longitudinal sectional view of the switch of FIG. 1 taken along a central line of the front surface thereof,
  • FIG. 3 is a wiring diagram of the inside of the switch.
  • FIG. 4 is a perspective view illustrating the mecha nism for detection of movement of the pointer of the ampere meter of FIG. 3.
  • a switch body 1 is of pressureand explosion-proof structure, and the whole body is manufactured by casting.
  • the switch body 1 has a box shape and is provided with a window opening 2 and push buttons 3,4 on its front face.
  • the push buttons are of such structure that depression of one of them sets the switch to an ON state and that of the other turns it to an OFF state.
  • a wire of a machine connected to the switch body extend through the guide tube la.
  • the window opening 2 is provided with a recess 2a on the back side inside the switch body and a transparent plate 5 made of acrylic resin is put into the recess.
  • a frame body 6, formed in the shape of a picture frame is superposed on the transparent plate and fixed therein by bolts 7.
  • the switch body 1 has an auxiliary board 8 for mounting various devices and an ampere meter 9 is mounted adjacent the window opening 2 on said auxiliary plate 8.
  • the ampere meter 9 is so arranged that the pointer 10 thereof can be read through the transparent plate 5.
  • the switch body 1 is provided on the upper surface lb with a hole into which an indication lamp 12 is fixed.
  • the auxiliary board 8 has an extension 8a with a socket 13 into which two electric lamps l4 and 15 of green and red colors, respectively, are put.
  • a protective mesh 16 is arranged on the surface of the indication lamp 12 for protection thereof.
  • sockets 17 are mounted at upper and lower parts of recess 2a and electric lamps 19 and 20 of green and red colors, respectively, are put into these sockets 17. These two lamps are connected with the electric lamps arranged in the indication lamp in such a manner that two lamps of the same color are connected in parallel with each other. It follows therefore that the indication lamp and the window opening always emit the same color.
  • a box 21 for accomodating the relay circuit is provided under the ampere meter 9 on the auxiliary board.
  • Boxes 22 and 23 are also provided for accomodating the switches at the positions corresponding to the push buttons 3 and 4 on the auxiliary board 8.
  • the switch according to this invention is connected with an electrical machine such as a motor (not shown) and electrical connection is made with the machine by depressing the push button 3.
  • the amount of current supplied to the machine is indicated by the pointer 10 of the ampere meter 9 and by observing the movement of the pointer from the window opening 2 a determination as to whether the machine is operating normally or not may be made.
  • the red lamps l and 20 are lit by operation of the relay circuit inside the box 21. It is, of course, noted that the ampere meter 9 indicates abnormal consumption by its pointer. However, occurrence of an abnormal event is more clearly shown by illuminating the entire window opening and the indication lamp with red color.
  • FIGS. 3 and 4 show how to switch electrical lamps according to a change in the consumption electric power.
  • the pointer of the ampere meter 9 is bent at a right angle in front of scale 91.
  • the pointer 10 is secured to spindle 92 which has an arm 93 extending toward the pointer 10.
  • a screen 94 is fixed on the arm 93 for interrupting light.
  • the scale 91 and the screen 94 are each in the form of a circular arc with a center at the spindle 92.
  • a neon lamp 95 always lit, is located at one side of the screen 94 and a photoconductive cell (CdS) 96 made of cadmium sulfide the value of current produced by the photoconductive cell will change depending upon the strength of light.
  • CdS photoconductive cell
  • FIG. 4 shows an arrangement wherein the screen 94 is located just in front of the neon lamp 95 and interrupts the light therefrom, and which indicates a dangerous condition.
  • the pointer 10 reaches approximately half of the scale 91 and this may be a rate current value.
  • the position of the neon lamp and the photoconductive cell may be changed.
  • the ampere meter 9 is supplied with a voltage through lines 101 and 102 which is stepped down for easy measurement.
  • the supply source of the circuit is obtained by connecting the power source supplied to the machine to the primary side of a transformer 105 through lines 103 and 104.
  • the neon lamp 95 is connected to the primary side of the transformer 105 through lines 106 and 107, thereby lighting the neon lamp.
  • Lines 108 and 109 are connected to the photoconductive cell and each has one end connected to the moving iron of a relay 110 and its other end connected to the moving iron of the relay through a transistor.
  • the secondary side of the transformer 105 has one end connected to the moving iron of the relay 110 and its other end connected through a line 111 to the junction point 112 between respective ends of the green lamp l9 and the red lamp 20.
  • the other lines 113 and 114 leading to the green and the red lamps are connected to the contact b and the contact a of the relay 110, respectively.
  • the moving contact of the relay is connected to the line of the secondary side of the transformer.
  • the electric lamps in the indication lamp 12 of the switch body 1 have respective lead-in lines 111a, 113a and 114a, each connected in parallel with the lines 11 l, I I3 and 114, respectively, so that the window opening and the indication lamp will light simultaneously with lamps of the same color.
  • the switch is capable of controlling the operative condition of machines by a pointer of an ampere meter and electrical lamps arranged in the window opening and the indication lamp, and therefore insures confirmation of safety of the machines.
  • An explosion-proof switch box with an alarm device for indicating an operating condition of a machine comprising:
  • an explosion-proof body having a front surface with a window opening therein, a botton surface with a guide tube therein providing means for passage therethrough of an electrical connection between said body and a machine, and an upper surface having a hole therein;
  • ampere meter positioned within said body adjacent said window opening and having a pointer visible through saidtransparent plate, said ampere meter being connectable to said machine;
  • first and second pushbuttons mounted in said front surface of said body
  • first and second switch means positioned in said body and connectable to said machine and connected respectively to said first and second pushbuttons, for respectively establishing and breaking electrical connection with said machine;
  • a relay circuit positioned in said body and connectable to said machine
  • first light source means extending through said hole in said upper body surface for exhibiting light of a first color
  • second light source means extending through said hole in said upper body surface for exhibiting light of a second color
  • third light source means positioned behind said transparent plate for exhibiting light of said first color through said entire transparent plate;
  • fourth light source means positioned behind said transparent plate for exhibiting light of said second color through said entire transparent plate; said first and third light source means being electrically connected in parallel to said relay circuit;
  • said second and fourth light source means being electrically connected in parallel to said relay circuit
  • detection means operatively connected to said ampere meter and said relay circuit, for detecting first positions of said pointer indicative of a first range of operating conditions of said machine and generating a signal to cause said relay circuit to energize said first and third light source means and to deenergize said second and fourth light source means, and for detecting second positions of said pointer indicative of a second range of operating conditions of said machine and generating a signal to cause said relay circuit to energize said second and fourth light source means and to deenergize said first and third light source means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Audible And Visible Signals (AREA)
US421639A 1973-07-13 1973-12-04 Explosion-proof type switch box with alarm device Expired - Lifetime US3924255A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1973082339U JPS5029150U (enrdf_load_stackoverflow) 1973-07-13 1973-07-13

Publications (1)

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US3924255A true US3924255A (en) 1975-12-02

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Application Number Title Priority Date Filing Date
US421639A Expired - Lifetime US3924255A (en) 1973-07-13 1973-12-04 Explosion-proof type switch box with alarm device

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US (1) US3924255A (enrdf_load_stackoverflow)
JP (1) JPS5029150U (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104909A (en) * 1976-11-10 1978-08-08 Ayers Wayne R Combination gauge
US5103215A (en) * 1990-10-10 1992-04-07 Federal Signal Corporation Device for signalling status of machines or processes
US6157311A (en) * 1999-01-07 2000-12-05 Berkovich; Yossi Portable electro-magnetic radiation sensor warning device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5311335A (en) * 1976-05-26 1978-02-01 Litton Systems Inc Microwave cooking utensils
JPS63226544A (ja) * 1987-03-17 1988-09-21 Matsushita Electric Ind Co Ltd オ−ブン皿
JPH0350424A (ja) * 1989-07-14 1991-03-05 Sanyo Electric Co Ltd 加熱調理装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704520A (en) * 1927-05-14 1929-03-05 William H Sommer Power-demand regulator
US2535279A (en) * 1946-02-04 1950-12-26 Atlas Supply Company Electrical apparatus for servicing automobiles
US2635137A (en) * 1951-12-26 1953-04-14 Westronics Inc Apparatus for controlling internal temperatures of foods while cooking same
US2680794A (en) * 1948-08-05 1954-06-08 Fed Electric Prod Co Push button station
US3332014A (en) * 1963-10-28 1967-07-18 Weston Instruments Inc Electric meter with light responsive limit indication
US3715661A (en) * 1969-03-24 1973-02-06 Sigma Instruments Inc Indicating meter with visual alarm
US3798626A (en) * 1972-02-28 1974-03-19 Gen Electric Foreign object impact detection in multi-bladed fluid engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4427385Y1 (enrdf_load_stackoverflow) * 1968-07-05 1969-11-15

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704520A (en) * 1927-05-14 1929-03-05 William H Sommer Power-demand regulator
US2535279A (en) * 1946-02-04 1950-12-26 Atlas Supply Company Electrical apparatus for servicing automobiles
US2680794A (en) * 1948-08-05 1954-06-08 Fed Electric Prod Co Push button station
US2635137A (en) * 1951-12-26 1953-04-14 Westronics Inc Apparatus for controlling internal temperatures of foods while cooking same
US3332014A (en) * 1963-10-28 1967-07-18 Weston Instruments Inc Electric meter with light responsive limit indication
US3715661A (en) * 1969-03-24 1973-02-06 Sigma Instruments Inc Indicating meter with visual alarm
US3798626A (en) * 1972-02-28 1974-03-19 Gen Electric Foreign object impact detection in multi-bladed fluid engines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104909A (en) * 1976-11-10 1978-08-08 Ayers Wayne R Combination gauge
US5103215A (en) * 1990-10-10 1992-04-07 Federal Signal Corporation Device for signalling status of machines or processes
US6157311A (en) * 1999-01-07 2000-12-05 Berkovich; Yossi Portable electro-magnetic radiation sensor warning device

Also Published As

Publication number Publication date
JPS5029150U (enrdf_load_stackoverflow) 1975-04-02

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