Electrical connectors – Contact comprising cutter – Insulation cutter
Patent
1994-05-13
1995-08-15
Pirlot, David L.
Electrical connectors
Contact comprising cutter
Insulation cutter
439397, H01R 424
Patent
active
054414229
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates generally to connectors and more specifically to an insulation piercing connecting device. The clamping slot made of flat material with at least two clamping legs between which a clamping slot extends essentially in the longitudinal direction of the device is formed by a shearing cut. An insulated connecting wire can be pushed into the slot so as to produce a contact. The slot has at its free end, a constriction for retaining the connecting wire in the clamping slot.
2. Background of the Related Art
An insulation piercing connecting device of this kind has been disclosed for example in DE 27 08 841 C2. According to this, a rounded-off small projection which, in the vicinity of the free end, projects into the clamping slot, is formed on one of the clamping legs by crowding. This projection makes it more difficult to pull out the connecting wire which is otherwise held by friction only. In particular, the projection prevents the connecting wire from loosening, for example when vibration occurs.
Insulation piercing connecting devices of this kind are required in large numbers in terminal strips. The thin punch which performs crowding is subject to a high degree of wear which requires frequent changing with subsequent re-adjustment of the deformation depth. Punches made of harder material are correspondingly more brittle and are more likely to fracture.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a cutting clamp providing improved retaining force for connecting an insulated connecting wire.
The extent of the clamping slot with the oblique section is constructed as an indented contour in the punching tool, which contour can be produced easily and permits a high standing amount between the subsequent grinding. In this way, the material expulsion associated with a high degree of wear is dispensed with.
The longitudinal displacement of the two legs with respect to one another can be produced in different ways depending on the type of clamp. In the sloping section of the clamping slot, a widened portion is produced, in which the connecting wire is held securely in the manner of a positive engagement. When pulling out the connecting wire, force components are produced which counteract the pulling-out force.
In an embodiment, constrictions and widened portions which permit a reliable clamping of the connecting wire are produced on the clamping slot. The sharp serration prevents pulling out to a greater degree than a rounded-off projection. When the clamping legs are displaced with respect to one another, they are spread apart from one another so that the widened portion of the clamping slot is further increased.
In another embodiment, the additional deflection of the clamping legs caused by the jagged edge is kept small without reducing the pulling-out force.
In a further embodiment, the outer slope of the depression is displaced inwards in relation to the projection so that it lies at least partially opposite the inner slope of the projection. The clamping slot is constricted in this area with a double inclination and as a result reliably prevents automatic slipping out, for example due to vibrations. Unintentional effects, e.g. when working on adjacent cutting clamps, require a discernible expenditure of force in order to release the connecting wire. These effects are accounted for in the present invention.
In another embodiment, it is possible to carry out the longitudinal displacement by selecting a suitable material and type of clamp.
In another embodiment, a bead-like bent-out portion can be constructed at low cost. However, in the case of spatial restrictions with respect to the extension perpendicular to the plane of the material, stretching of one of the clamping legs is to be preferred. As a result of which the thinness of the cutting clamp is retained.
In an embodiment, the shortening of the leg can be combined with an offset of the legs in the direction of the connecting wire. This produces imp
REFERENCES:
patent: 4097107 (1978-06-01), Hawkins
patent: 4220390 (1980-09-01), Cobaugh et al.
patent: 4682835 (1987-07-01), Aujla et al.
patent: 4806119 (1989-02-01), Herfort et al.
Pirlot David L.
Siemens Aktiengesellschaft
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