US2255926A - Electrical apparatus - Google Patents

Electrical apparatus Download PDF

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Publication number
US2255926A
US2255926A US257154A US25715439A US2255926A US 2255926 A US2255926 A US 2255926A US 257154 A US257154 A US 257154A US 25715439 A US25715439 A US 25715439A US 2255926 A US2255926 A US 2255926A
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US
United States
Prior art keywords
contact
blade
electrical apparatus
corrugated
blade elements
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
US257154A
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English (en)
Inventor
Muller-Hillebrand Dietrich
Proschmann Max
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Application granted granted Critical
Publication of US2255926A publication Critical patent/US2255926A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H1/42—Knife-and-clip contacts

Definitions

  • Another object of this invention is to effect. a. saving in material used in electrical apparatus by...
  • Figure l is a side elevational view showing theprinciples oi our invention applied to"- a fuse structure
  • Fig. 2 is an end view of the. fuse structure shown in Fig. 1;
  • the reference numeral 'l designates a cartridge fuse having a cylindrical body portion 9 of insulating. material and a pairof metalli'ccollars or ferrules l ldisposed on opposite ends thereof.
  • Each of the ferrules I i has a corrugated blade projection l3 extending therefrom.
  • Theblade projections I3 are adapted tobe seated between a pair of sp'acedparallel plate-members ll constituting acontact jaw I9.
  • Each-contact jaw l9 is provided witha threaded terminal Stud 22! whichserves, to a secure the contactjaws to: an insulating panel 23,- a.nd'-also provides a terminal for external circuit connections;
  • the electrical circuit between the two metallic ferrules ll is com'pleted .by' a fusible element of conventional'fc'rm (not shown) within the cylin drical body portion 9i
  • the blade projections 13 are of corrugated form which provides a-series of linec'onta'ctsbetween the'bladep'ortions l3 and the plate membersll of the contact jaws l9:
  • the blade portions 13 may, therefore; be constructed of relatively thin flexible-material without impairing the rigidity thereof in a direction atright angles to the corrugations.
  • the corrugated structure does not impair I the torsional-flexibilityof'the blade portions is;
  • the grooved or corrugated form of blade member incre'asesthe current carrying capacity of the member in that it provides greater surface area for cooling purposes for a given external dimension'.
  • FIG. 3 is an elevation view showingour inv'ention embodied in a disconnect switch structure
  • Fig. 4 is an end view of thestructure sl'iown in Fig. 3;' and Figs. 5 and 6 are, respectively,- elevational 'an'd it; the corrugations'thereof will tend to befiatten-ed out to-provide a plurality of spaced line contacting'portio'ns under pressure.
  • Fig. 4 is an end view of thestructure sl'iown in Fig. 3;' and Figs. 5 and 6 are, respectively,- elevational 'an'd it; the corrugations'thereof will tend to befiatten-ed out to-provide a plurality of spaced line contacting'portio'ns under pressure.
  • Figs. 3 and 4 the principles of our invention are shown applied to a disconnect switch consisting of a pair of contact terminals 21 and 29 mounted upon spaced insulators 3
  • and 33 may be carried by a suitable base or support 35.
  • the contact terminals 21 and 29 are bridged by a pair of blade elements 31, and are preferably hinged to the contact terminal 29 by the bolt 39 passing therethrough.
  • Each of the blade elements 31 are preferably of,
  • the corrugated" form of blade elements 3'! provides a switch blade structure which has the requisite rigidity longitudinally of the blade elements, and also" sufiicient' torsional flexibility to enable the blade elements to make a series of line contacts small as compared with its width and which has at least one side thereof longitudinally grooved for increasing its torsional flexibility about a longitudinal axis and for providing at least one convex limited area contact surface.
  • a movable contact having aibifurcated portion 51 is adapted to make sliding engagement with the stationary contact member 5
  • the corrugated cont'actblade is flexible about an axis parallel to the corrugations so as to provide a series of line contacts with the cooperating contact surfaces.
  • described in connection with the several figures i of the drawing, may be formed of conducting;
  • corrugated conductors may be formed by machining slots or grooves in conductors of regular form.
  • a'relatively thin flexible blade member normally connecting said contact means and movable into and out of engagement with at least one of said contact means, said blade member being corrugated longitudinally throughout the width thereof on at 5 least one side for providing-torsional flexibility of said blade member about :a longitudinal axis, and" increasing the rigidity of said blade memher in a direction at right'angles to the corruga- ,g
  • a circuit making 'and'breaking device comprising a pair of spaced terminals, a pair of blade elements hinged to oppositesides of oneofsaid:
  • a circuit'making and breaking device come prising a pair of spacedterminals, a pair .of blade elements ,hinged on opposite sides to one ofsaidterminals for swinging movementinto and out, of engagement with the other terminal, and means drawing said blade elements toward each other into contacting engagement with the opposed sides of said terminals, said blade elements being corrugated throughout their length to provide a series of substantially line contacts with the opposed sides of saidterminals.
  • a current carrying I elongated flexible bridging member having longitudinal corrugations extending substantially axis, but which is substantially rigid with respect to a forceapplied to said bridging member in the plane of said corrugations andat an angle thereto.
  • a thin flexible current carrying'bridging member having rounded corrugations on opposite sides thereof to stiffen the. same and provide'a plurality of's-paced substantially linecontact portions at each end,
  • each of said members-having a contact jaw comprising; a pair of relatively rigid spaced parallel plate members, anelongated bridging member having cooperating relatively thin contactg surfaces, h chare ap d-tec nser d be both pairs of said spaced parallel plate members to complete an electrical circuit through said terminal members, said relatively thin contact surfaces having a plurality of spaced longitudinal slots for increasing the torsional flexibility thereof about a longitudinal axis to provide for a more intimate contact between the contact surfaces of said bridging member and said contact jaws despite contact surface irregularities and misalignment of said contact jaws.

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  • Fuses (AREA)
US257154A 1938-02-19 1939-02-18 Electrical apparatus Expired - Lifetime US2255926A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE208428X 1938-02-19

Publications (1)

Publication Number Publication Date
US2255926A true US2255926A (en) 1941-09-16

Family

ID=5794233

Family Applications (1)

Application Number Title Priority Date Filing Date
US257154A Expired - Lifetime US2255926A (en) 1938-02-19 1939-02-18 Electrical apparatus

Country Status (3)

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US (1) US2255926A (en))
CH (1) CH208428A (en))
NL (1) NL52307C (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864916A (en) * 1957-07-23 1958-12-16 Gen Electric Canada Blade type cartridge fuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864916A (en) * 1957-07-23 1958-12-16 Gen Electric Canada Blade type cartridge fuse

Also Published As

Publication number Publication date
CH208428A (de) 1940-01-31
NL52307C (en))

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