Reed switch manufacture |
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| 申请号 | US42373573 | 申请日 | 1973-12-11 | 公开(公告)号 | US3883949A | 公开(公告)日 | 1975-05-20 |
| 申请人 | COMTELCO UK LTD; | 发明人 | HILL JOHN; TURCZANSKI HENRYK; | ||||
| 摘要 | A method for precisely positioning the conductive elements of an electrical device within a sealed enclosure. As applied to the manufacture of high accuracy reed switches, the method includes the steps of initially disposing the contact reed blades (reeds) of the switch in the relative position desired in the finished product; rigidly joining the reeds within a region adjacent the respective contact areas to maintain the established geometry; sealing the reeds within an enclosure while joined as aforesaid to retain the established relative position; and thereafter eliminating the connection joining the reeds within the sealed enclosure to provide a completed switch with contacts permanently and precisely spaced in accordance with the pre-established relative position. | ||||||
| 权利要求 | 1. A method for precisely positioning a pair of coacting conductive switch contacts within a sealed enclosure comprising the steps of: disposing said contacts in a fixed predetermined spatial relationship; rigidly joining said contacts with an electrically conductive meltable connection while in said fixed predetermined spatial relationship; sealing said contacts while joined as aforesaid within an enclosure whereby said rigid connection retains said contacts in said predetermined spatial relationship; and eliminating said connection between said contacts by melting said rigid connection within said enclosure. 2. A method for precisely positioning a pair of coacting conductive switch contacts within a sealed enclosure in accordance with claim 1 and including: the step of relieving stresses and strains in said meltable connection after rigidly joining said contacts. 3. A method for precisely positioning a pair of coacting conductive switch contacts within a sealed enclosure in accordance with claim 1 wherein: said contacts are joined by welding a rigid meltable metal strap across said contacts; and an electrical current is directed through said contacts and welded strap to heat and anneal said strap to relieve residual stresses and strains therein while said contacts remain in said fixed predetermined spatial relationship. 4. A method for precisely positioning a pair of coacting conductive switch contacts within a sealed enclosure in accordance with claim 3 wherein: said contacts when rigidly joined by said welded meltable metal strap are disposed in fixed overlapping relationship in the region of said strap. 5. A method for precisely positioning a pair of coacting conductive switch contacts within a sealed enclosure in accordance with claim 4 wherein: said contacts, when disposed in said predetermined overlapping relationship are separated in the region of said overlap to provide a gap between the respective confronting surfaces thereof. 6. A method of fabricating an electrical reed switch comprising the steps of: disposing first and second electrically conductive, magnetic reed blades in a fixed predetermined spatial relationship defining confronting switch contacts; rigidly joining said reed blades with a rigid meltable conductive metal strap while said reed blades are disposed in said fixed predetermined spatial relationship; relieving stresses and strains in said meltable metal strap while said reed blades are firmly maintained in said fixed predetermined spatial relationship thereby providing a self supporting integral assembly of said reed blades and strap; sealing said integral assembly within a rigid enclosure with selected portions of said reed blades extending outwardly therefrom while said rigid metal strap remains joined to said reed blades entirely within said enclosure; and directing an electrical current serially through said reed blades and said strap to melt and burn-out said within said sealed enclosure to provide electrical separation of said reed blades within said enclosure, with said enclosure providing rigid mechanical support for said reed blades. 7. A method of fabricating an electrical reed switch comprising the steps of: disposing and firmly retaining first and second electrically conductive, magnetic reed blades each having a flexible relatively flat spatial and an integral lead portion in a fixed spatiall relationship with said flat portions spaced and overlapping in part to define confronting switch contacts having a predetermined gap; welding a rigid meltable conductive metal strap to said reeds across said gap while said reed blades are firmly retained as aforesaid in said fixed predetermined spatial relationship; directing an electrical current through ssaid reed blades and strap to heat and anneal said strap to receive stresses and strains therein while said reed blades are firmly maintained in said fixed predetermined spatial relationship, thereby providing a self supporting integral assembly of said reed blades and strap; hermetically sealing said integral assembly within a tubular glass enclosure with said lead portions of said reed blades extending outwardly therefrom while said rigid metal strap remains joined to said reed blades entirely within said glass enclosure; and directing an electrical current serially through said reed blades and said strap within said sealed glass enclosure to selectively melt and burn-out said strap to provide electrical separation of said reed blades within said glass enclosure, with said glass providing rigid mechanical support for said reed blades. 8. A method for precisely positioning a pair of coacting conductive elements within a sealed enclosure comprising the steps of: disposing first and second elements in a fixed predetermined spatial relationship; rigidly joining said elements with an electrically conductive meltable strap while in said fixed predetermined spatial relationship; sealing said elements while joined as aforesaid within an enclosure whereby said rigid connection retains said elements iN said predetermined spatial relationship; and eliminating said connection between said elements by melting said rigid strap within said enclosure. 9. A method for precisely positioning a pair of coacting conductive elements according to claim 8 wherein: said first and second elements comprise reed blades; said step of disposing said elements includes the step of positioning said reed blades along a common linear axis defining a gap between confronting ends of said reed blades along said common axis; said strap comprises a contact section attached to one of said reed blades and confronting a portion of said other reed blade in overlapping spaced relationship defining confronting switch contacts, and an integral fuse section joining said contact section to said second reed blade; and said eliminating step includes the step of melting said fuse section. 10. A method for precise positioning a pair of coactive conductive elements within a sealed enclosure according to claim 8 wherein said disposing step includes positioning said elements along a common linear axis and defining a gap along said axis and between the confronting ends thereof; and including the step of attaching a rigid conductive metal member to one of said elements, said member being disposed across said gap and in overlapping spaced relationship with the other element to define switch contacts. 11. A method for precisely positioning a pair of coacting conductive elements within a sealed enclosure according to claim 10 wherein said elements are joined by welding a rigid meltable metal strap across the confronting ends thereof. |
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