Geometrical instruments
Patent
1983-09-26
1984-10-23
Abrams, Neil
Geometrical instruments
29857, 339273F, H01R 450
Patent
active
044784759
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of the type described wherein a thin connecting wire is secured to a tubular pin whose one end is embedded or pressed into a hole in a massive block, preferably of plastics, by clamping the wire in the pin.
The miniaturization of electrical and electronic components, which has for many years characterized the technological development in this field, has inter alia resulted in a need for ever smaller plug pins for various types of replaceable units, e.g. pickup units. The wires used for establishing a connection between the coils of such a unit and the pins are so thin that it is difficult to secure them by soldering. It is known to avoid these difficulties by using a relatively short, slightly conical plug which is forced into the tubular pin and clamps the wire between the plug and the tube wall. The largest diameter of the plug is approximately the same as the internal diameter of the tube so that the end portion of the wire is flattened and the enamel bursts which provides a good electrical contact even though the wire is insulated. In other words, it is not necessary to deinsulate the wire before it is secured to the pin.
The object of the invention is to provide a method of said type which is more suitable for being carried out automatically than the known one.
This object is achieved by carrying out the method as defined herein because this execution of the process renders it unimportant how the plugs face when fed to the piston that forces them into the plug pins. This is a great advantage in practice because the very small plugs, which may e.g. have a length of 5.3 mm and a diameter of 0.55 mm, are very difficult to orient in a specific direction.
When the largest diameter of the plug is equal to the internal diameter of the tube the wire is cut as the plug is inserted, and the thickness of the wire gradually decreases at the clamped section from full wire diameter to zero. The plug also braces the pin, and to this end the plug may suitably have substantially the same length as the pin.
The invention also relates to a plug for use in the carrying out of the said method, the characteristics of the plug of the invention being defined herein.
The invention will be explained more fully below with reference to the drawing, which shows a greatly increased section of an embedded plug pin in which a connecting wire is secured by the method and plug of the invention.
In the drawing 10 is a tubular plug pin which is chamfered at the ends and whose one end is located in a cylindrical hole 11 in abutment on a shoulder 12 defined between the hole 11 and a co-axial hole 13 of reduced diameter in a plastics block 14, which may e.g. be part of the housing of a pickup unit. The pin 10 comprises a connecting wire 15 which extends through the hole 13 and is clamped between the tube wall and a plug 16 which is forced into the tube 10 from its free end. The plug 16 has an uninterrupted cylindrical central portion 17 and two conical end portions 18. The conical end portions are substantially the same and evenly merge into the central portion of the plug. Additionally, the end portions are gradually tapering and have blunt ends, the radius of the plug at the outermost end of each conical end portion being no greater than the difference between the inner radius of the pin less the diameter of the wire. The central portion 17 has at least approximately the same diameter as the tube hole. Before the plug is inserted the wire 15 is extended through the entire tube. As the plug is inserted the wire is cut, and the clamped end portion of the wire is flattened so that its thickness decreases from full diameter at the front portion of the conical end portion 18 to zero at the transition between said end portion and the cylindrical central portion 17. As shown, the plug 16 is inserted so far that the central portion 17 extends a distance into the area of the pin 10 which is enclosed by plastics material. This ensures an effective and stable electrical connection between wire and pin and also the
REFERENCES:
patent: 2523797 (1950-09-01), Weisberg
patent: 3014140 (1961-12-01), Tupper
patent: 3461768 (1969-08-01), Ultes, Jr.
patent: 3492629 (1970-01-01), Hirsch
patent: 3824554 (1974-07-01), Shoholm
patent: 3951503 (1976-04-01), Caulkins
patent: 4057315 (1977-11-01), Miller et al.
patent: 4059330 (1977-11-01), Shirey
patent: 4270824 (1981-06-01), Erickson
Abrams Neil
Ortofon Manufacturing A/S
LandOfFree
Method and plug for securing a connecting wire to a tubular pin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and plug for securing a connecting wire to a tubular pin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and plug for securing a connecting wire to a tubular pin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1595713