US2335388A - Switching device - Google Patents

Switching device Download PDF

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Publication number
US2335388A
US2335388A US374599A US37459941A US2335388A US 2335388 A US2335388 A US 2335388A US 374599 A US374599 A US 374599A US 37459941 A US37459941 A US 37459941A US 2335388 A US2335388 A US 2335388A
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US
United States
Prior art keywords
carbon
contacts
parts
contact
disks
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Expired - Lifetime
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US374599A
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English (en)
Inventor
Conradty Ottmar
Zollner Hans
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Individual
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Individual
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Publication of US2335388A publication Critical patent/US2335388A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/027—Composite material containing carbon particles or fibres

Definitions

  • SWITCHING DEVICE Filed Jan. 15, 1941 Eff/l 4 Patented Nov. 30, 1943 SWITCHING DEVICE Ottmar Conradty, Rothenbach-on-the-Pegnitz,
  • This invention relates to switching devices or controllers and has particular reference to drum type switches.
  • a special object of the present invention is to provide contact pieces of a material ensuring a reliable switching action and preventing the formation of sparks and other phenomena inherent to controllers having metal contact pieces.
  • Fig. 1 is an axial section of a controller cylinder having the invention applied thereto.
  • Fig. 2 is a section on line A-A of Fig. 1, showing the parts in their switched-in position.
  • Fig. 3 is a similar section, showing the parts in their switched-off position.
  • Fig. 4 is an end elevation showing a modification in the switched-in position of the parts.
  • Fig. 5 is a similar elevation showing the parts in their switched-off position.
  • Fig. 6 is an end elevation of another modification, switched-in, and
  • Fig. 7 is a similar elevation in switched-off position of the parts.
  • the active contact pieces of the drum type switch consist of artificial carbon or graphite material.
  • artificial carbon or graphite material offers considerable advantages over metal contacts, sineethe carbon material is not liable to evaporation and burning off as a result of the breaking sparks occurring in switching devices of the kind referred to. Therefore, no molten beads are produced as with metal contacts and the carbon contacts do not require permanent attendance as by greasing. Also their duration of life exceeds that of metal contacts.
  • the oxide layers produced on the surface of metal contacts of drum type w hes Owin to the influence of the atmosphere which interfere with the passage of current do not occur with our novel carbon contacts;
  • the switching drum is composed of a plurality of contact disks of carbon or graphite material arranged in series with intermediate insulating parts on a common shaft, from which the carbon disks are insulated.
  • a plurality of carbon disks SK and intermediate insulating and spacer disks J are mounted on a sleeve JW of insulating material surrounding the drum shaft W.
  • the shaft may be operated by a hand wheel B or by an operating lever.
  • the carbon disks SK are capable of engaging stationary contacts K (Fig. 2) or, by turning the shaft through an angle of may be removed from said contacts, thus breaking the passag of current from or to said contacts K (Fig. 3).
  • the contact disks are made with an oval shape as seen from Figs.
  • the disks are circular plates with partly flattened circumferential faces.
  • the disks SK may consist of two parts each, which at their abutting faces may be in direct electrical contact or provided with intermediate insulating layers F, depending upon the switching operations to be performed by the device. Irrespective of its conductive or insulating character, the intermediate layer F will include a cement for holding the two carbon parts to ether.
  • the contact disks may consist of four or more parts 8K1, 8K2, 8K3, 8K4, as shown in Figs. 4 and 5, the parts SKI, SKZ, 8K3, 3K4, being electrically connected or insulated from one another at F, for engagement with, or disengagement from, stationary contacts K1, K2, K3, K4.
  • the contact disks are formed with cam portions and intermediate recesses corresponding in number to the number of contact points, as shown in Figs. 4 and 5. It will be noted from Fig.
  • edges of the outer contact surfaces of the segments SKi to 5K4 curve inwardly and then form reentrant curves extending to the faces in contact with adjacent segments; also that the edges of the contact faces of the contacts K1 to K4 curves away from the outer faces of the segments. Any arcing which occurs on breaking the circuit does not occur at the face but at the sides of the segmental and spring contacts.
  • the carbon disk SKN in this case is in the form of an eccentric cam disk which may be required, for instance, to efiect a rapid interruption of the current between the stationary contacts K1, K2, by rotation of the disk in the direction of the arrow.
  • a drum type switching device comprising spring pressed stationary contacts, a non-round drum shaft, a plurality of carbon segments fitting said shaft and formed with radial faces cemented to one another, said segments having outer circumferential contact faces curved inwardly at their edges and joining said faces in a reentrant curve.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Contacts (AREA)
US374599A 1939-10-09 1941-01-15 Switching device Expired - Lifetime US2335388A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE216236X 1939-10-09

Publications (1)

Publication Number Publication Date
US2335388A true US2335388A (en) 1943-11-30

Family

ID=5828125

Family Applications (1)

Application Number Title Priority Date Filing Date
US374599A Expired - Lifetime US2335388A (en) 1939-10-09 1941-01-15 Switching device

Country Status (5)

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US (1) US2335388A (enrdf_load_html_response)
BE (1) BE439440A (enrdf_load_html_response)
CH (1) CH216236A (enrdf_load_html_response)
FR (1) FR874314A (enrdf_load_html_response)
NL (1) NL57499C (enrdf_load_html_response)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503040A (en) * 1947-02-28 1950-04-04 Jr Frank Gradischnig Switch socket
US2798915A (en) * 1954-01-04 1957-07-09 James P Watson Snap acting mechanism
US3719201A (en) * 1971-03-12 1973-03-06 M Minks Automobile electrical system
US4399779A (en) * 1980-07-23 1983-08-23 Nissan Motor Co., Ltd. Distributor with sliding contacts
US6222139B1 (en) * 1999-09-15 2001-04-24 General Electric Company Rotary electric switch and contact therefore
US20110042190A1 (en) * 2006-12-14 2011-02-24 Kruetten Viktor Electrical switch with a contact element mounted such that it can rotate

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503040A (en) * 1947-02-28 1950-04-04 Jr Frank Gradischnig Switch socket
US2798915A (en) * 1954-01-04 1957-07-09 James P Watson Snap acting mechanism
US3719201A (en) * 1971-03-12 1973-03-06 M Minks Automobile electrical system
US4399779A (en) * 1980-07-23 1983-08-23 Nissan Motor Co., Ltd. Distributor with sliding contacts
US6222139B1 (en) * 1999-09-15 2001-04-24 General Electric Company Rotary electric switch and contact therefore
US20110042190A1 (en) * 2006-12-14 2011-02-24 Kruetten Viktor Electrical switch with a contact element mounted such that it can rotate
US8592707B2 (en) * 2006-12-14 2013-11-26 Ids-Technology Gmbh Electrical switch with a contact element mounted such that it can rotate

Also Published As

Publication number Publication date
NL57499C (enrdf_load_html_response)
FR874314A (fr) 1942-08-04
BE439440A (enrdf_load_html_response)
CH216236A (de) 1941-08-15

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