Patent US4746784A successfully refreshed from Google Patents.
US4746784A
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Method of attaching a lead to a metal end cap of a safety fuse
Assignee: Littelfuse Tracor BV
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Filing: 1986-06-05
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Granted: 1988-05-24
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Expires: 2006-06-05
Abstract
Abstract A method of attaching a lead to a metal end cap of an otherwise complete miniature-type safety fuse having a fuse element secured to the interior of said end caps by connecting means, is characterized in that the attaching is effected by a soldering operation which comprises holding one end of said lead against said end cap, wherein the region where attachment is to take place there is a given amount of solder, and supplying to said region a metered amount of energy in the form of one or more energy pulses producing over a given period enough total energy to melt said quantity of solder, but of insufficient total energy to penetrate through said end cap and adversely affect the bonding of said fuse element thereto.
Inventors
- 👤 Leendert Vermij
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:10
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/005; B23K1/0056; H; H01; H01H; H01H69/00; H01H69/02; H01H85/00; H01H85/02; H01H85/04; H01H85/05; H01H85/143; H01H11/00; H01H2011/0087; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49107
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A method of attaching a lead to a metal end cap of an otherwise complete miniature-type safety fuse having a fuse element secured to the interior of said end caps by connecting means, characterized in that the attaching is effected by a soldering operation which comprises holding one end of said lead against said end cap, wherein the region where attachment is to take place there is a given amount of solder, and supplying to said region a metered amount of energy in the form of one or more energy pulses producing over a given period enough total energy to melt said quantity of solder, but of insufficient total energy to penetrate through said end cap and adversely affect the bonding of said fuse element thereto.
Claim 2
Independent Claim
126 words
A method of attaching a lead to a metal end cap of an otherwise complete miniature-type safety fuse having a fuse element secured to the interior of said end caps by connecting means, characterized in that the attaching is effected by a soldering operation which comprises holding one end of said lead against said end cap, wherein the region where attachment is to take place there is a given amount of solder, and supplying to said region a metered amount of energy in the form of one or more energy pulses producing over a given period enough total energy to melt said quantity of solder, but of insufficient total energy to penetrate through said end cap and adversely affect the bonding of said fuse element thereto.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1, characterized in that said metered amount of energy is supplied to said region to be soldered by means of a pulsing laser.
Claim 4
Dependent Claim
47 words
A method as claimed in claim 2, characterized by using a pulsing Nd-YAG laser providing laser pulses having a pulsed energy of at least 10 Joules over a period no longer than 10 milliseconds to solder tin-plated copper wires of a greater thickness to nickel-plated end caps.
Claim 5
Dependent Claim
34 words
A method as claimed in claim 1, characterized in that said metered amount of energy is supplied to said region to be soldered using resistance heating by means of discharge pulses from a capacitor.
Claim 6
Dependent Claim
55 words
A method as claimed in claim 1, characterized in that said metered amount of energy is supplied to said region to be soldered by means of a pulsed arc discharge, with said region to be soldered being positioned in the focal point of a lens or mirror system to concentrate the energy in that point.
Claim 7
Dependent Claim
18 words
A method as claimed in claim 1 characterized in that said end of said lead is previously upset.
Claim 8
Dependent Claim
51 words
A method as claimed in claim 1 characterized in that said end of said lead is previously upset and wherein said given amount of solder is provided by putting a ring of solder material around said end of said lead, which ring is retained by the upset part of the end.
Claim 9
Dependent Claim
30 words
A method as claimed in claim 1 characterized in that said given amount of solder is provided by previously attaching a drop of solder to said end of said lead.
Claim 10
Dependent Claim
23 words
A method as claimed in claim 1 characterized in that a quantity of soldering flux is applied to said area to be soldered.
Claim 11
Dependent Claim
12 words
The method of claim 1 wherein said end caps are nickel-plated copper.
References Cited (Backward Citations)
US3793604A
Cited
US3911246A
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DE2505871A1
Cited
DE2531291A1
Cited
US4016527A
Cited
US4320281A
Cited
US4587395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |