US1736204A - Protector for radio sets - Google Patents

Protector for radio sets Download PDF

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Publication number
US1736204A
US1736204A US286702A US28670228A US1736204A US 1736204 A US1736204 A US 1736204A US 286702 A US286702 A US 286702A US 28670228 A US28670228 A US 28670228A US 1736204 A US1736204 A US 1736204A
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United States
Prior art keywords
protector
radio sets
wire
switch
tube
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Expired - Lifetime
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US286702A
Inventor
Ludwig Louis
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Individual
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Individual
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Priority to US286702A priority Critical patent/US1736204A/en
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Publication of US1736204A publication Critical patent/US1736204A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
    • H03F1/548—Protection of anode or grid circuit against overload

Definitions

  • My invention relates to protector for radio sets using commercial current and has for its main object to provide a device which may readily be attached to any such set and which will effectively protect it from injuries, such as would be caused by an increase of the potential of the current normally used, and to so construct the device that it will function as a fuse.
  • a further object is to provide a device of few parts, small in size, neat in appearance and inexpensive to manufacture.
  • Fig. 1 is a crosssectional top View of the device
  • Fig. 2 is a top view
  • Fig. 3 is a cross-sectional end view taken on line 33, Fig. 1, and
  • Fig. 4 is a fragmental side view of one of the parts in the device.
  • the protector consists of a tubular body member 10, having a fixture socket 11 inserted in one end and a two-pronged plug 12 inserted in the other end.
  • a switch 13 is inserted in the side of the body member and a resistance coil 14 is secured in a cradle 15 attached on the inside of the body member.
  • the coil is constructed of a thin resistance 1;; wire 16 wound upon an asbestos cord 17
  • the asbestos cord is wound in a helix and imbedded in a suitable plastic material 18.
  • the coil is so constructed as to allow only a given voltage to pass through it to the set, any higher voltage will be absorbed or cause the coil to burn out.
  • a wire 19 connects the prong 20 of the plug 12 with one side of the switch 13
  • a wire 21 connects the other side of the switch with the outer contact 22 of the socket 11
  • one end of the resistance wire 16 is connected to the center contact 23 of the socket, and the other end of this wire is connected to the prong 24.
  • the plug 12 is in- 1928.
  • Patent In a device of the class described, an insulating tube, a recessed disc inserted in one end of said tube, two metal prongs secured on said disc in spaced relation, a lamp socket secured in the other end of the tube, a switch mounted in the side of the tube, a resistance element secured inside the tube, one of said prongs electrically connected through the switch with one contact of the lamp socket, and the other prong connected through the resistance element with the other lamp socket contact.

Description

' Nov. 19, 1929.
L. LUDWIG PROTECTOR FOR RADIO SETS Filed June 19. 1928 INVENTOR 1001 s Zudvwy TTORNEY Patented Nov. 19, 1929 LOUIS LUDWIG, or BROOKLYN, NEW YORK PROTECTOR FOR RADIO SETS Application filed June 19,
My invention relates to protector for radio sets using commercial current and has for its main object to provide a device which may readily be attached to any such set and which will effectively protect it from injuries, such as would be caused by an increase of the potential of the current normally used, and to so construct the device that it will function as a fuse. A further object is to provide a device of few parts, small in size, neat in appearance and inexpensive to manufacture.
These and other objects and advantages will be readily understood from the following description and from the accompanying drawing of a preferred embodiment, but it will be noted that modifications might be made without departing from the scope of the. invention. In the drawing,
0 Fig. 1 is a crosssectional top View of the device,
Fig. 2 is a top view,
Fig. 3 is a cross-sectional end view taken on line 33, Fig. 1, and
Fig. 4 is a fragmental side view of one of the parts in the device.
The protector consists of a tubular body member 10, having a fixture socket 11 inserted in one end and a two-pronged plug 12 inserted in the other end. A switch 13 is inserted in the side of the body member and a resistance coil 14 is secured in a cradle 15 attached on the inside of the body member.
The coil is constructed of a thin resistance 1;; wire 16 wound upon an asbestos cord 17 The asbestos cord is wound in a helix and imbedded in a suitable plastic material 18. The coil is so constructed as to allow only a given voltage to pass through it to the set, any higher voltage will be absorbed or cause the coil to burn out.
The various parts are electrically connected as follows. A wire 19 connects the prong 20 of the plug 12 with one side of the switch 13, a wire 21 connects the other side of the switch with the outer contact 22 of the socket 11, one end of the resistance wire 16 is connected to the center contact 23 of the socket, and the other end of this wire is connected to the prong 24. In operation the plug 12 is in- 1928. Serial No. 286,702.
Patent is- In a device of the class described, an insulating tube, a recessed disc inserted in one end of said tube, two metal prongs secured on said disc in spaced relation, a lamp socket secured in the other end of the tube, a switch mounted in the side of the tube, a resistance element secured inside the tube, one of said prongs electrically connected through the switch with one contact of the lamp socket, and the other prong connected through the resistance element with the other lamp socket contact.
US286702A 1928-06-19 1928-06-19 Protector for radio sets Expired - Lifetime US1736204A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US286702A US1736204A (en) 1928-06-19 1928-06-19 Protector for radio sets

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Application Number Priority Date Filing Date Title
US286702A US1736204A (en) 1928-06-19 1928-06-19 Protector for radio sets

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US1736204A true US1736204A (en) 1929-11-19

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Family Applications (1)

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US286702A Expired - Lifetime US1736204A (en) 1928-06-19 1928-06-19 Protector for radio sets

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421321A (en) * 1945-08-13 1947-05-27 Dial Light Co Of America Inc Gaseous conduction lamp socket
US20050266710A1 (en) * 2004-05-28 2005-12-01 Yau-Tzung Liu Switching plug structure with resistor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421321A (en) * 1945-08-13 1947-05-27 Dial Light Co Of America Inc Gaseous conduction lamp socket
US20050266710A1 (en) * 2004-05-28 2005-12-01 Yau-Tzung Liu Switching plug structure with resistor

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