US3555210A - Switch contact mounting for rotary switches - Google Patents

Switch contact mounting for rotary switches Download PDF

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US3555210A
US3555210A US828220A US3555210DA US3555210A US 3555210 A US3555210 A US 3555210A US 828220 A US828220 A US 828220A US 3555210D A US3555210D A US 3555210DA US 3555210 A US3555210 A US 3555210A
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Prior art keywords
contact
carrier
openings
boss
tabs
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US828220A
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Lonnie J Richardson
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Oak Electro Netics Corp
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Oak Electro Netics Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch
    • H01H19/58—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H15/00—Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
    • H01H15/02—Details
    • H01H15/06—Movable parts; Contacts mounted thereon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier
    • H01H2011/067—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier by deforming, e.g. bending, folding or caulking, part of the contact or terminal which is being mounted

Definitions

  • Opposed tabs on the contact blade extend into the openings, securing the blade on the carrier.
  • the method of assembly of the contact to the carrier in which the tabs initially extend at an angle from the plane of the contact, the contact and carrier are moved together with the tabs extending into the openings and the tabs are straightened.
  • Deforming the legs is an assembly step which adds to the cost. Furthermore, where contact blades are provided on both sides of the carrier, the positions of blade legs extending through the carrier limit the possible contact locations and thus the versatility of the switch.
  • the carrier has a supporting surface, a retaining surface spaced therefrom and defining an opening therebetween, and that the contact has a mounting tab which extends into the opening. More specifically, a pair of openings are defined between the retaining surface and the supporting surface and the contact has a pair of mounting tabs, one received in each of the openings. The openings face in opposite directions and the tabs on the contact are opposed.
  • a boss extends outwardly from the supporting surface and has opposed walls with an opening in each to define oppositely facing openings.
  • the contact has a hole therein which receives the boss and a pair of mounting tabs on the contact extend into the openings.
  • a further feature of the invention is the method of assembling a contact to a carrier in which the carrier has a supporting surface with a spaced retaining surface defining a pair of oppositely facing openings and the contact has a pair of opposed tabs extending at an acute angle from the plane of the contact.
  • the method includes the steps of moving the carrier and contact together with the tabs extending into the openings and straightening the tabs to secure the contact to the carrier. More particularly, the tabs are straightened either by movement against the carrier supporting surface or by movement against a tool.
  • FIG. 1 is a plan view of a rotary switch section embodying the invention
  • FIG. 2 is a fragmentary section taken along line 2-2 of FIG.
  • FIG. 3 is an enlarged fragmentary section taken along line 3-3 of FIG. 2;
  • FIG. 4 is a fragmentary plan view of the rotary switch contact carrier without the contact thereon;
  • FIG. 5 is a fragmentary section taken along line 5-5 of FIG. 4;
  • FIG. 6 is a plan view of the rotor blade blank
  • FIG. 7 is an enlarged fragmentary section taken along the line 7-7 of FIG. 6;
  • FIG. 8 is a fragmentary illustration of a position of the contact blade and support during assembly
  • FIG. 9 is a view similar to FIG. 8 with the parts assembled
  • FIG. 10 is a fragmentary plan view of a contact blade mounting in a slide switch, utilizing the invention.
  • FIG. 11 is a fragmentary elevation of the contact mounting of FIG. 10;
  • FIG. 12 is a partially assemblied view of the contact blade and supporting surface for the slide switch of FIG. 10;
  • FIG. 13 is a view similar to FIG. 12 showing the parts in assembled condition.
  • FIGS. 1 through 3 A section of a rotary switch embodying the invention is shown in FIGS. 1 through 3.
  • a ringlike stator 20- has a plurality within the central opening of stator 20 and having contact blades 25, 26 mounted on the upper and lower surfaces 27 28 thereof.
  • the switch stator 20 has diametrically opposed mounting ears 30 through which strut screws 31 extend for mounting the switch section from a suitable support.
  • switch sections are mounted in elongated stacks with a plurality of similar switch sections.
  • a switch operating shaft 32 extends through a central opening in the rotor carrier 23 to turn contacts 25 and 26 with respect to the stator 20. Where the switch section is one of several in a rotary switch stack, shaft 32 operates all the rotors.
  • Circular rotor carrier 23 has on each side thereof a plurality of outwardly extending bosses 35 spaced angularly around the periphery of the carrier.
  • the contact blades 25, 26 have corresponding openings 36, FIG. 6, through which bosses 35 extend when the contacts are in position on supporting surfaces 27, 28.
  • each boss 35 has a pair of lateral sidewalls 37 in which there are lateral openings 38 above the adjacent surface 27 of the rotor.
  • the upper boundary of opening 38 is a retaining surface 39 spaced from the carrier surface 27.
  • openings 38 are provided by including in the mold a pin (not shown) which extends through the rotor body defining the passage 40 and having a width greater than the spacing between lateral walls 37.
  • Bosses 35 are preferably noncircular in cross section. In the illustrated rotary switch, they have a T-shaped cross section with the crossbar at the carrier periphery and the leg extending radially inwardly therefrom.
  • the lateral walls 37 are those of the leg of the T. 1
  • the contact blade 25 illustrated in FIG. 6 has openings 36 for each of the bosses 35.
  • the openings have a T-shaped configuration corresponding with the cross section of the bosses.
  • Tabs 42, FIG. 3, extend into openings 37, between retaining surface 38 and the carrier supporting surface 27 holding the contact 25 in place.
  • the tabs 42 associated with each opening 36 are opposed to extend into the corresponding oppositely facing openings 37.
  • FIGS. 8 and 9 illustrate a method of assembling the contact blade to the carrier.
  • the blade blank, FIGS. 6 and 7, has the tabs 42 extending downwardly at an acute angle with respect to the plane of the contact, from fold lines 43 spaced apart a distance greater than the width of the leg portion of the T- shaped boss 35.
  • the inner edges 44 of the tabs are spaced apart a distance slightly greater than the spacing of sidewalls 36, but less than the width of opening 40.
  • the contact 25 is placed on the rotor carrier 23 with the openings 36 in align ment with bosses 35. This positionof the two rotor elements is illustrated in FIG. 8.
  • the contact and carrier are then moved toward each other with tabs 42 extending into openings 37.
  • tabs 42 engage the corners 46 between the supporting surface and opening 40.
  • the'conta'ct which may be caused by a tool 47, bends tabs 42 upwardly into the general plane of contact 25, in which position they extend under retaining surface 38, FIG. 9, securing the contact blade to the carrier.
  • the rotor contact may be a full circle as illustrated in FIGS. 1 and 6, or may be one or more smaller segments, depending on the switching action which is desired.
  • a contact segment may be mounted on a single boss and still have mechanical stability.
  • FIGS. 10 and 11 illustrate its incorporation in a slide switch.
  • the slide switch carrier "50 only a portion of which is shown, has mounting bosses "51 spaced along itslength.
  • the slide switch stator with its associated wiper contacts is not illustrated in FIGS. 10 and 11.
  • a suitable contact arrangement is shown, for example, in Mastney et al. U.S. Pat. No. 2,213,845.
  • bosses have a base portion 52 with a rectangular cross section, there being openings 53 in the spaced sidewalls 54 of the base.
  • carrier 50 may suitably be molded of plastic material and the openings 53 formed by a mold member or pin, which extends into an opening 57 in the carrier, from the opposite side.
  • Contact blade 58 is mounted on the carrier with bosses 51 extending through it. Opposed tabs 59 on the contact 58 extend into oppositely facing openings 53 securing the contact in place.
  • Intermediate mounting bosses 51 is a contact positioning boss 60 of circular cross section.
  • Contact blade 58 may be mounted on the carrier in much the same manner as is illustrated in FIGS. 8 and 9. In the event, however, that movement of the contact blade against the carrier surface does not provide adequate straightening of the contact tabs, an additional tool may be utilized as illustrated in FIGS. 12 and 13.
  • tool 47' forces contact blade 58 against carrier 50 with tabs 59 extending into openings 53.
  • Tool 62 extends into opening 57 from the underside of carrier 50, urging the tabs 59 upwardly against the retaining surface 63 of boss 51. It will be understood that a tool of the character of element 62 may be utilized in a assembling either the rotary switch or the slide switch form of the invention.
  • contact mounting means comprising:
  • boss means extending outwardly from said supporting surface and having opposed sidewalls, each with an opening therein defining a retaining surface spaced from said supporting surface;
  • said boss means includes a boss having opposed walls with an opening in each to define oppositely facing openings, said contact having a hole therein receiving said boss, with a pair of opposed mounting tabs on said contact one extending into each of said openings.
  • the rotor mounting means of claim 2 having a plurality of bosses with openings on the carrier with corresponding plural holes in and mounting tabs on said contact.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

A mounting for a contact blade on a carrier surface. The carrier surface has a boss which extends upwardly with openings in opposite side walls. Opposed tabs on the contact blade extend into the openings, securing the blade on the carrier. The method of assembly of the contact to the carrier in which the tabs initially extend at an angle from the plane of the contact, the contact and carrier are moved together with the tabs extending into the openings and the tabs are straightened.

Description

United States Patent Lonnie J. Richardson Elgin, Ill.
May 27, 1969 J an 12, 1971 Oak hlectro/Netics Corporation a corporation of Delaware inventor Appl. No. Filed Patented Assignee SWITCH CONTACT MOUNTING FOR ROTARY SWITCHES 8 Claims, 13 Drawing Figs.
US Cl 200/11, 200/ l 66 Int. Cl H01h 19/58 Field of Search 200/1 1D, 166lCTS [56] References Cited UNITED STATES PATENTS 3,209,110 9/1965 Meyer 200/1 1(D)x 3,248,488 4/1966 Stephan 200/1 1(D) 3,288,949 11/1966 Brown, Jr. 200/11(D) Primary ExaminerRobert K. Schaefer Assistant Examiner.l. R. Scott Attorney-Hofgren, Wegner, Allen, Stellman & McCord ABSTRACT: A mounting for a contact blade on a carrier surface. The carrier surface has a boss which extends upwardly with openings in opposite side walls. Opposed tabs on the contact blade extend into the openings, securing the blade on the carrier. The method of assembly of the contact to the carrier in which the tabs initially extend at an angle from the plane of the contact, the contact and carrier are moved together with the tabs extending into the openings and the tabs are straightened.
PATENTEU JAN 1 2197! Y SHEET 1 OF 3 7; J ENVENTOR zaizzzzffilyfw ATTORNEYS PATENTED mam SHEET 3 OF 3 EUR SWITCH CONTACT MOUNTING FOR ROTARY SWITCHES There are several types of electrical switches which use a blade contact, commonly in conjunction with a plurality of wiper contacts, as in a rotary or a slide switch. It is usual to mount the contact blade on a carrierby legs which extend through the carrier ant. are deformed, securing it in place. See for example Allison US. Pat. No. 2,196,433; Mastney US. Pat. No. 2,594,190; Williams U.S. Pat. No. 2,960,581.
Deforming the legs is an assembly step which adds to the cost. Furthermore, where contact blades are provided on both sides of the carrier, the positions of blade legs extending through the carrier limit the possible contact locations and thus the versatility of the switch.
It is a principal object of this invention to provide a contact mounting which does not use legs extending through the carrier; and further to provide an economical method for assembling the contacts to the carrier.
One feature of the invention is that the carrier has a supporting surface, a retaining surface spaced therefrom and defining an opening therebetween, and that the contact has a mounting tab which extends into the opening. More specifically, a pair of openings are defined between the retaining surface and the supporting surface and the contact has a pair of mounting tabs, one received in each of the openings. The openings face in opposite directions and the tabs on the contact are opposed.
Another feature is that a boss extends outwardly from the supporting surface and has opposed walls with an opening in each to define oppositely facing openings. The contact has a hole therein which receives the boss and a pair of mounting tabs on the contact extend into the openings.
A further feature of the invention is the method of assembling a contact to a carrier in which the carrier has a supporting surface with a spaced retaining surface defining a pair of oppositely facing openings and the contact has a pair of opposed tabs extending at an acute angle from the plane of the contact. The method includes the steps of moving the carrier and contact together with the tabs extending into the openings and straightening the tabs to secure the contact to the carrier. More particularly, the tabs are straightened either by movement against the carrier supporting surface or by movement against a tool.
Further features and advantages of the invention will readily be apparent from the following specification and from the drawings, in which:
FIG. 1 is a plan view of a rotary switch section embodying the invention;
FIG. 2 is a fragmentary section taken along line 2-2 of FIG.
FIG. 3 is an enlarged fragmentary section taken along line 3-3 of FIG. 2;
FIG. 4 is a fragmentary plan view of the rotary switch contact carrier without the contact thereon;
FIG. 5 is a fragmentary section taken along line 5-5 of FIG. 4;
FIG. 6 is a plan view of the rotor blade blank;
FIG. 7 is an enlarged fragmentary section taken along the line 7-7 of FIG. 6;
FIG. 8 is a fragmentary illustration of a position of the contact blade and support during assembly;
FIG. 9 is a view similar to FIG. 8 with the parts assembled;
' FIG. 10 is a fragmentary plan view of a contact blade mounting in a slide switch, utilizing the invention;
FIG. 11 is a fragmentary elevation of the contact mounting of FIG. 10;
FIG. 12 is a partially assemblied view of the contact blade and supporting surface for the slide switch of FIG. 10; and
FIG. 13 is a view similar to FIG. 12 showing the parts in assembled condition.
A section of a rotary switch embodying the invention is shown in FIGS. 1 through 3. A ringlike stator 20-has a plurality within the central opening of stator 20 and having contact blades 25, 26 mounted on the upper and lower surfaces 27 28 thereof.
The switch stator 20 has diametrically opposed mounting ears 30 through which strut screws 31 extend for mounting the switch section from a suitable support. Commonly such switch sections are mounted in elongated stacks with a plurality of similar switch sections. A switch operating shaft 32 extends through a central opening in the rotor carrier 23 to turn contacts 25 and 26 with respect to the stator 20. Where the switch section is one of several in a rotary switch stack, shaft 32 operates all the rotors.
Circular rotor carrier 23 has on each side thereof a plurality of outwardly extending bosses 35 spaced angularly around the periphery of the carrier. The contact blades 25, 26 have corresponding openings 36, FIG. 6, through which bosses 35 extend when the contacts are in position on supporting surfaces 27, 28.
As best seen in FIGS. 3 and 5, each boss 35 has a pair of lateral sidewalls 37 in which there are lateral openings 38 above the adjacent surface 27 of the rotor. The upper boundary of opening 38 is a retaining surface 39 spaced from the carrier surface 27.
Where the rotor carrier 23 is molded of a plastic material, which is a convenient method of manufacture, openings 38 are provided by including in the mold a pin (not shown) which extends through the rotor body defining the passage 40 and having a width greater than the spacing between lateral walls 37.
Bosses 35 are preferably noncircular in cross section. In the illustrated rotary switch, they have a T-shaped cross section with the crossbar at the carrier periphery and the leg extending radially inwardly therefrom. The lateral walls 37 are those of the leg of the T. 1
The contact blade 25 illustrated in FIG. 6 has openings 36 for each of the bosses 35. The openings have a T-shaped configuration corresponding with the cross section of the bosses. Tabs 42, FIG. 3, extend into openings 37, between retaining surface 38 and the carrier supporting surface 27 holding the contact 25 in place. The tabs 42 associated with each opening 36 are opposed to extend into the corresponding oppositely facing openings 37.
FIGS. 8 and 9 illustrate a method of assembling the contact blade to the carrier. The blade blank, FIGS. 6 and 7, has the tabs 42 extending downwardly at an acute angle with respect to the plane of the contact, from fold lines 43 spaced apart a distance greater than the width of the leg portion of the T- shaped boss 35. The inner edges 44 of the tabs are spaced apart a distance slightly greater than the spacing of sidewalls 36, but less than the width of opening 40. The contact 25 is placed on the rotor carrier 23 with the openings 36 in align ment with bosses 35. This positionof the two rotor elements is illustrated in FIG. 8. The contact and carrier are then moved toward each other with tabs 42 extending into openings 37. As contact 25 moves toward the supporting surface 27 of the carrier, tabs 42 engage the corners 46 between the supporting surface and opening 40. Continued movement of the'conta'ct, which may be caused by a tool 47, bends tabs 42 upwardly into the general plane of contact 25, in which position they extend under retaining surface 38, FIG. 9, securing the contact blade to the carrier.
The rotor contact may be a full circle as illustrated in FIGS. 1 and 6, or may be one or more smaller segments, depending on the switching action which is desired. As the'contact has a pair of opposed tabs 42 which extend into oppositely directed openings on each boss, a contact segment may be mounted on a single boss and still have mechanical stability.
The contact mounting of the present invention is notlimited to use in a rotary switch. FIGS. 10 and 11 illustrate its incorporation in a slide switch. The slide switch carrier "50, only a portion of which is shown, has mounting bosses "51 spaced along itslength. The slide switch stator with its associated wiper contacts is not illustrated in FIGS. 10 and 11. A suitable contact arrangement is shown, for example, in Mastney et al. U.S. Pat. No. 2,213,845.
The bosses have a base portion 52 with a rectangular cross section, there being openings 53 in the spaced sidewalls 54 of the base. As in the rotary switch, carrier 50 may suitably be molded of plastic material and the openings 53 formed by a mold member or pin, which extends into an opening 57 in the carrier, from the opposite side. Contact blade 58 is mounted on the carrier with bosses 51 extending through it. Opposed tabs 59 on the contact 58 extend into oppositely facing openings 53 securing the contact in place. Intermediate mounting bosses 51 is a contact positioning boss 60 of circular cross section.
Contact blade 58 may be mounted on the carrier in much the same manner as is illustrated in FIGS. 8 and 9. In the event, however, that movement of the contact blade against the carrier surface does not provide adequate straightening of the contact tabs, an additional tool may be utilized as illustrated in FIGS. 12 and 13. Here, tool 47' forces contact blade 58 against carrier 50 with tabs 59 extending into openings 53. Tool 62 extends into opening 57 from the underside of carrier 50, urging the tabs 59 upwardly against the retaining surface 63 of boss 51. It will be understood that a tool of the character of element 62 may be utilized in a assembling either the rotary switch or the slide switch form of the invention.
l claim:
1. In a switch, contact mounting means comprising:
a carrier having a supporting surface;
boss means extending outwardly from said supporting surface and having opposed sidewalls, each with an opening therein defining a retaining surface spaced from said supporting surface;
a planar contact blade on said carrier; and
a pair of opposed mounting tabs integral with said contact,
each extending into one of said openings, engaging the associated retaining surface to secure said contact on said carrier.
2. The contact mounting means of claiml in which said boss means includes a boss having opposed walls with an opening in each to define oppositely facing openings, said contact having a hole therein receiving said boss, with a pair of opposed mounting tabs on said contact one extending into each of said openings.
3. The contact mounting means of claim 2 in which a passage extends through said carrier and into said boss, one dimension of the passage being greater than the corresponding dimension of the boss to define the openings in said sidewalls, adjacent said supporting surfaces.
4. The contact mounting means of claim 2 in which said boss has a T configuration, with said openings in the leg of the 5. The contact mounting means of claim 4 in which said carrier is a circular rotor, and the leg of the T-shaped boss extends radially thereof.
6. The contact mounting means of claim 5 in which the cross bar of the T is located farther from the center of the carrier than the leg.
7. The rotor mounting means of claim 2 having a plurality of bosses with openings on the carrier with corresponding plural holes in and mounting tabs on said contact.
8. The contact mounting means of claim 3 in which said carrier has back-to-back supporting surfaces with mounting bosses extending outwardly from each, the bosses on one supporting surface being staggered with respect to the bosses on the other surface.

Claims (8)

1. In a switch, contact mounting means comprising: a carrier having a supporting surface; boss means extending outwardly from said supporting surface and having opposed sidewalls, each with an opening therein defining a retaining surface spaced from said supporting surface; a planar contact blade on said carrier; and a pair of opposed mounting tabs integral with said contact, each extending into one of said openings, engaging the associated retaining surface to secure said contact on said carrier.
2. The contact mounting means of claim 1 in which said boss means includes a boss having opposed walls with an opening in each to define oppositely facing openings, said contact having a hole therein receiving said boss, with a pair of opposed mounting tabs on said contact one extending into each of said openings.
3. The contact mounting means of claim 2 in which a passage extends through said carrier and into said boss, one dimension of the passage being greater than the corresponding dimension of the boss to define the openings in said sidewalls, adjacent said supporting surfaces.
4. The contact mounting means of claim 2 in which said boss has a T configuration, with said openings in the leg of the T.
5. The contact mounting means of claim 4 in which said carrier is a circular rotor, and the leg of the T-shaped boss extends radially thereof.
6. The contact mounting means of claim 5 in which the cross bar of the T is locatEd farther from the center of the carrier than the leg.
7. The rotor mounting means of claim 2 having a plurality of bosses with openings on the carrier with corresponding plural holes in and mounting tabs on said contact.
8. The contact mounting means of claim 3 in which said carrier has back-to-back supporting surfaces with mounting bosses extending outwardly from each, the bosses on one supporting surface being staggered with respect to the bosses on the other surface.
US828220A 1969-05-27 1969-05-27 Switch contact mounting for rotary switches Expired - Lifetime US3555210A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030196881A1 (en) * 2002-04-19 2003-10-23 Kramski Gmbh Fastening of a contact element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209110A (en) * 1962-12-06 1965-09-28 Oak Mfg Co Self-aligning contact assembly
US3248488A (en) * 1961-02-20 1966-04-26 Globe Union Inc Switch construction and contact clip mounting arrangement therefor
US3288949A (en) * 1964-01-17 1966-11-29 Ledex Inc Multiple switch assembly having stator contacts with prestressed jaws and alignment means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248488A (en) * 1961-02-20 1966-04-26 Globe Union Inc Switch construction and contact clip mounting arrangement therefor
US3209110A (en) * 1962-12-06 1965-09-28 Oak Mfg Co Self-aligning contact assembly
US3288949A (en) * 1964-01-17 1966-11-29 Ledex Inc Multiple switch assembly having stator contacts with prestressed jaws and alignment means

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030196881A1 (en) * 2002-04-19 2003-10-23 Kramski Gmbh Fastening of a contact element
US6812418B2 (en) * 2002-04-19 2004-11-02 Kramski Gmbh Fastening of a contact element

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