US2939937A - Lifting card - Google Patents

Lifting card Download PDF

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Publication number
US2939937A
US2939937A US703900A US70390057A US2939937A US 2939937 A US2939937 A US 2939937A US 703900 A US703900 A US 703900A US 70390057 A US70390057 A US 70390057A US 2939937 A US2939937 A US 2939937A
Authority
US
United States
Prior art keywords
card
lifting
spring
springs
lifting card
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
US703900A
Other languages
English (en)
Inventor
Rejdin Arne Axel Gunnar
Wahl Sten Lennart Melker
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US2939937A publication Critical patent/US2939937A/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
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/56—Contact spring sets
    • H01H50/58—Driving arrangements structurally associated therewith; Mounting of driving arrangements on armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/56—Contact spring sets

Definitions

  • the present invention refers to a lifting card of the kind used for actuating spring groups of relays, crossbar switches and'the like.
  • the lifting card is usually located in slots punched in the springs.
  • the lifting card is, at least along one edge, provided with slits, the width of which corresponds to the thickness of the springs, and by means of which it engages the springs.
  • the lifting card is locked against displacement in the longitudinal direction of the springs by the top spring slot being shorter than the slots of the other springs, so that the lifting card rests against an edge of the top spring slot, while at the lower end it might be locked against displacement in the longitudinal direction of the springs, for example by engaging a member provided for actuating the lifting card.
  • the springs usually arcuately performed to lightly tension the springs so that each one of them rests against one edge of the respective slit of the card with a light pressure, opposed to the lifting direction. It is possible that one or several springs might lose this pretension and tend to bend in the lifting direction so as to rest against the upper edge of the slit.
  • the card impedes the bending of all the springs, except for the top one that is not engaged by any slit of the card.
  • the known device is thus subject to two disadvantages.
  • the top spring has to be provided with a slot shorter than that of the other springs signifying the necessity of manufacturing two types of springs.
  • the card does not limit the movement of the top spring in the lifting direction.
  • the object of the invention is to eliminate these disadvantages.
  • the lifting card made in accordance with the present invention makes it possible to use a uniform spring, and limits the upward movement of the top spring as well as the other springs. This is achieved by the lifting card being provided, on one side of the end portion adjacent to the top spring, with a projection, that on the one hand forms a retaining surface for the upper surface of said spring, and on the other hand forms a contact surface for one edge of the slot, while it has on the opposite side a cut out, the one edge of which forms a retaining surface for the lower surface of the spring, which retaining surface is parallel to the one arranged for the upper surface.
  • the size of the cut out is such that the largest width of the end portion of the card is less than the length of the slot, so that the spring can be slipped over said end portion.
  • FIG. 1 shows the design of a conventional lifting card
  • Fig. 2 shows the design of the lifting card according to the invention
  • Fig. 3 shows a side view of the spring group with the lifting card
  • Fig. 4 shows a top view of the arrangement according to Fig. 2.
  • a contact spring group consisting of ten movable springs 2 is shown to include a lifting card 2,939,937 Patented June 7, 1960 2 1.
  • the contact springs are fixed to a base plate 3 by means of insulating spacers, and are intended to be carried by the lifting card in the upward direction into contact with the fixed contact members 4.
  • the springs are provided with slots 6, through which the lifting card is extended, which card is provided with slits 7, with which the springs can engage.
  • the lower end of the card engages a formed spring 5 that is fixed to the base plate and prevents this end of the card from moving in one longitudinal direction of the springs.
  • the card has a projection 8 at the one side. This projection has a cut out with two perpendicularly related edges 9 and 10 which form contact surfaces for the top spring.
  • the edge 9 forms a retaining surface for the upward movement of the spring, the
  • the end portion restingv against an edge of the spring slot and preventing movement of the upper end of the card in the opposite longitudinal direction of the springs.
  • the end portion has a cut out, the one edge of which'for'rns a supporting surface 11 for the lower surface of the spring, the position of which thus is fixed in relation to the card.
  • the size of the cut out is chosen in such a manner, that the largest width is smaller than the length of the slot, so that the spring can he slipped over the end portion of the card.
  • the card is positioned before the mounting of the top spring, whereafter the latter is slipped over the projecting part of the card and fixed to the spring group.
  • a switching device having a plurality of substantially stationary contacts and a plurality of coacting contact springs stacked with respect to each other, each spring having a terminal contact at one end and being secured at the other end in a fixed position by insulation means, all of said contact springs having a uniformly located, longitudinal slot of equal size intermediate the opposite ends thereof, a longitudinally movable lifting card of insulation material extending through all of said slots, lifting projections integral with one edge of said lifting card facing one end of each of said spring slots, one projection underlying each spring for flexing the same in one direction into engagement with the corresponding stationary contact in response to movement of said lifting card, and a first bearing portion integral with one end of said lifting card overlying the upper surface of said one end of the uppermost spring in the stack to secure said lifting card against longitudinal movement in a direction opposite to said one direction.
  • a switching device having a plurality of substantially stationary contacts and a plurality of coacting contact springs stacked with respect toeach other, each spring having a terminal contact at one end and being secured at the other end in a fixed position by insulation means, all of said contact springs having a uniformly located longitudinal slot of equal size intermediate to the opposite ends thereof, a lifting card of insulation material extending through all of said slots, lifting projections in tegral With one edge of said lifting card facing one end ,of each of said spring slots, one projection underlying each spring for flexing the same in one direction into engagement with the corresponding stationary contact in response to movement of said lifting card, a first bearing portion integral with one end of saidlifting card overlying the upper surface of the uppermost spring in movement relative to said stack in a direction opposite to said one direction, a second bearing portion integral with the 'edge' of said lifting card opposite to said lifting projections andadjacent to said one end of said lifting card, said second bearing portion being in abutthe stack to secure said lifting card against

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
US703900A 1957-02-15 1957-12-19 Lifting card Expired - Lifetime US2939937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE822257X 1957-02-15

Publications (1)

Publication Number Publication Date
US2939937A true US2939937A (en) 1960-06-07

Family

ID=20349277

Family Applications (1)

Application Number Title Priority Date Filing Date
US703900A Expired - Lifetime US2939937A (en) 1957-02-15 1957-12-19 Lifting card

Country Status (5)

Country Link
US (1) US2939937A (it)
DE (1) DE1095947B (it)
FR (1) FR1199287A (it)
GB (1) GB822257A (it)
NL (2) NL101324C (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3204061A (en) * 1961-10-02 1965-08-31 Gen Signal Corp Electromagnetic relay structure
US3236987A (en) * 1963-06-11 1966-02-22 Sigma Instruments Inc Contact element assembly including positioning means
US4035587A (en) * 1975-11-24 1977-07-12 Brent Hawkley Undhjem Wire termination block switching arrangement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282687A (en) * 1938-06-13 1942-05-12 Western Electric Co Set of contact springs for electrical switching apparatus
US2632065A (en) * 1948-11-02 1953-03-17 Automatic Telephone & Elect Electrical switching apparatus
US2686850A (en) * 1950-10-26 1954-08-17 Itt General purpose relay
US2782270A (en) * 1952-12-22 1957-02-19 Ericsson Telefon Ab L M Contact spring group in electromagnetic connecting apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL98120C (it) * 1954-04-21

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282687A (en) * 1938-06-13 1942-05-12 Western Electric Co Set of contact springs for electrical switching apparatus
US2632065A (en) * 1948-11-02 1953-03-17 Automatic Telephone & Elect Electrical switching apparatus
US2686850A (en) * 1950-10-26 1954-08-17 Itt General purpose relay
US2782270A (en) * 1952-12-22 1957-02-19 Ericsson Telefon Ab L M Contact spring group in electromagnetic connecting apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3204061A (en) * 1961-10-02 1965-08-31 Gen Signal Corp Electromagnetic relay structure
US3236987A (en) * 1963-06-11 1966-02-22 Sigma Instruments Inc Contact element assembly including positioning means
US4035587A (en) * 1975-11-24 1977-07-12 Brent Hawkley Undhjem Wire termination block switching arrangement

Also Published As

Publication number Publication date
NL101324C (it)
DE1095947B (de) 1960-12-29
GB822257A (en) 1959-10-21
FR1199287A (fr) 1959-12-11
NL223312A (it)

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